A connection structure for submarine pipelines

Abstract

The present invention discloses a connection structure of a submarine pipeline, including a pipeline body, hollow connecting pipes are provided at both ends of the pipeline body, a plurality of rivet holes are evenly opened on the upper surface of the hollow connecting pipe, a plurality of rivet holes are connected to the hollow part of the hollow connecting pipe, the outer walls of the two abutting pipeline bodies are in contact with a plurality of support frames, a welding assembly for welding the two pipeline bodies is provided at the abutting part of the two hollow connecting pipes, a pneumatic inner joint device is tightly attached to the inner walls of the two pipeline bodies, and the upper surfaces of the two abutting hollow connecting pipes are connected to two thickened plates by a plurality of rivets. The present invention solves the problem that the installation of the circular track on the pipe is extremely inconvenient and the process is cumbersome because the pipe is thick and heavy and the pipe itself has no installation hole for installing the positioning circular track.

Description

Technical Field

[0001] The invention relates to a connection structure of a submarine pipeline. Background Art

[0002] Marine natural gas must be transported out through marine pipelines, while crude oil extracted from shallow seas can be directly loaded into oil tankers from production platforms. However, for crude oil extracted from deep seas, large oil tankers docking at production platforms will threaten the safety of the platforms, so single-point moorings dedicated to docking large oil tankers have emerged in the sea. In this way, there must be an oil pipeline connecting each production platform with the single-point mooring. Submarine pipelines are generally transported to pipe-laying ships by transport ships, and the pipe-laying ships connect and install the submarine pipelines. The operation process is to add a cement weighting layer to the pipes after the onshore prefabrication plant, and then transport them to the pipe-laying ship by ship. The pipes are assembled and welded section by section. When the pipe-laying ship moves forward, the welded pipe sections slide into the sea from the stinger at the stern of the ship. During the entire pipe-laying operation, the length of the pipe section must be synchronized with the displacement of the ship, and the pipe-laying ship must be in a relatively stable state. For this reason, 4 to 6 anchors are arranged in front, behind, left and right of the pipe-laying ship. Adjusting the tightness of the anchor cable can stabilize the ship; adjusting the length of the anchor cable can move the ship. When the pipe section slides from the tail of the stinger to the seabed, it is suspended in the seawater to form an S-shape that turns from an upper arch to a downward bend, causing the pipe section to be subjected to complex bending stress. Therefore, the ship has sufficient tension machines to clamp the pipe section to prevent it from sliding freely and make the pipe section slide down at the same displacement distance as the ship. When welding the submarine pipeline, it is difficult to rotate due to the heavy weight of the pipeline. The only way is to install the circular track on the pipe and weld the pipe by a welding robot. However, since the pipe is thick and heavy and there is no installation hole for installing the positioning circular track on the pipe, the installation of the circular track on the pipe is extremely inconvenient and the process is cumbersome. Summary of the invention

[0003] The object of the present invention is to provide a connection structure of a submarine pipeline to solve the problems raised in the above background technology.

[0004] The technical solution for achieving the above-mentioned purpose is: a connection structure of a submarine pipeline, including a pipeline body, hollow connecting pipes are provided at both ends of the pipeline body, and a plurality of rivet holes are evenly opened on the upper surface of the hollow connecting pipe, and a plurality of the rivet holes are connected to the hollow part of the hollow connecting pipe. The front end of the hollow connecting pipe is chamfered, and the outer walls of the two abutting pipeline bodies are in contact with a plurality of support frames. A welding assembly for welding the two pipeline bodies is provided at the abutting position of the two hollow connecting pipes, and a pneumatic inner joint device is tightly attached to the inner walls of the two pipeline bodies. The upper surfaces of the two abutting hollow connecting pipes are connected to two thickened plates by a plurality of rivets, and the hollow connecting pipes are filled with thermal insulation mortar.

[0005] Preferably, the welding assembly includes a welding robot, a first guide rail mechanism, a sliding mounting base and a rail clamp, the two abutting hollow connecting tubes are located inside the first guide rail mechanism, the sliding mounting base is slidably connected to the first guide rail mechanism, the sliding mounting base is provided with a welding robot, the rear end of the sliding mounting base is provided with the rail clamp, and movable wheels and a plurality of electrical parts are installed inside the sliding mounting base.

[0006] Preferably, the first guide rail mechanism comprises two semi-annular first guide rails, four flanges, a first support column, a second support column, a threaded rod, a drive motor, a second guide rail, two sliders, a support plate, a plurality of hydraulic cylinders and a support base, the two abutting hollow connecting pipes are located inside the two semi-annular first guide rails, the outer wall of each of the semi-annular first guide rails is respectively connected to two of the flanges, the two contacting flanges are threadedly connected by bolts, nuts and other parts, the outer walls of the two semi-annular first guide rails are respectively connected to the first support column and the second support column, the lower surface of the second support column is connected to the inner bottom surface of the second guide rail, The lower end of the first support column is provided with two sliding blocks, and the two sliding blocks are slidably connected to the second guide rail. The lower surface of the first support column contacts the inner bottom surface of the second guide rail. The first support column is threadedly connected to the spiral end of the threaded rod, and the unthreaded end of the threaded rod is rotatably connected to the second support column. The threaded rod is connected to the output end of the driving motor. The fixed end of the driving motor is arranged on the upper surface of the support plate. The upper surface of the support plate is connected to the second guide rail. The lower surface of the support plate is connected to the telescopic rods of the plurality of hydraulic cylinders, and the fixed ends of the plurality of hydraulic cylinders are connected to the inner bottom surface of the supporting base.

[0007] Preferably, threaded holes are provided on each pressing block of the pneumatic internal joint device, and the pressing blocks of the pneumatic internal joint device are connected to a semi-annular support plate via threads, and the semi-annular support plate is tightly attached to the inner wall of the hollow connecting tube.

[0008] Preferably, the pipeline body is composed of a first steel pipe, a polyurethane foam layer, a second steel pipe, an anti-corrosion insulation layer and a concrete counterweight layer, the two hollow connecting pipes are connected to the first steel pipe, the two hollow connecting pipes and the first steel pipe are interconnected, the outer wall of the first steel pipe is connected to the second steel pipe, a polyurethane foam layer is provided between the first steel pipe and the second steel pipe, and the outer wall of the second steel pipe is provided with the anti-corrosion insulation layer.

[0009] Preferably, a plurality of support frames are provided with clamps.

[0010] Preferably, the outer wall of the pipeline body is connected to a concrete counterweight layer.

[0011] Preferably, a plurality of the support frames are provided with anti-skid pads, and the anti-skid pads are in contact with the concrete counterweight layer.

[0012] The beneficial effect of the present invention is that the driving motor drives the threaded rod to rotate, and at this time the first support column drives the corresponding semi-circular first guide rail to approach the other semi-circular first guide rail until the flanges on the two semi-circular first guide rails are in close contact with each other, and then the flanges in close contact with each other are fixed to each other using bolts and nuts, so that a circular track for the welding robot to move is formed. This installation method is simple, convenient and fast, and can greatly improve the efficiency of welding;

[0013] The upper surfaces of the two abutting hollow connecting tubes are connected to two thickened plates by multiple rivets, and the two thickened plates are fixed to the two abutting hollow connecting tubes, thereby increasing the stability of the connection;

[0014] The hollow connecting pipe is filled with thermal insulation mortar, and a polyurethane foam layer is arranged between the first steel pipe and the second steel pipe, which plays a good thermal insulation role. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a stereogram of the present invention;

[0016] Figure 2 is a cross-sectional view of the present invention;

[0017] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0018] Figure 4 is a schematic diagram of the interior of a welding assembly of the present invention;

[0019] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0020] Figure 6 yes Figure 4 A partial enlarged view of point C in the middle;

[0021] Figure 7 It is a schematic diagram of the riveting process after welding of the present invention;

[0022] Figure 8 yes Figure 7 A partial enlarged view of point D in the middle.

[0023] In the figure: 1. pipeline body; 2. hollow connecting pipe; 3. rivet hole; 4. support frame; 6. pneumatic internal adapter; 7. thickened plate; 9. semi-circular support plate; 10. rivet; 11. first steel pipe; 12. polyurethane foam layer; 13. second steel pipe; 14. anti-corrosion insulation layer; 15. concrete counterweight layer; 51. welding robot; 52. first guide rail mechanism; 53. sliding mounting base; 54. rail clamp; 521. semi-circular first guide rail; 522. flange; 523. first support column; 524. second support column; 525. threaded rod; 526. drive motor; 527. second guide rail; 528. slider; 529. support plate; 5210. hydraulic cylinder; 5211. support base. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] A connection structure of a submarine pipeline comprises a pipeline body 1, two hollow connecting pipes 2, a plurality of support frames 4, and a welding assembly.

[0027] Hollow connecting pipes 2 are provided at both ends of the pipe body 1. Multiple rivet holes 3 are evenly opened on the upper surface of the hollow connecting pipe 2. Multiple rivet holes 3 are connected to the hollow part of the hollow connecting pipe 2. The front end of the hollow connecting pipe 2 is chamfered. The outer walls of the two abutting pipe bodies 1 are in contact with multiple support frames 4. The abutting parts of the two hollow connecting pipes 2 are provided with welding components for welding the two pipe bodies 1. The inner walls of the two pipe bodies 1 are tightly attached with a pneumatic inner joint device 6. The upper surfaces of the two abutting hollow connecting pipes 2 are connected with two thickened plates 7 by multiple rivets 10. The two thickened plates 7 are fixed to the two abutting hollow connecting pipes 2, which increases the stability of the connection. The hollow connecting pipe 2 is filled with thermal insulation mortar, which can play a thermal insulation role.

[0028] The welding assembly includes a welding robot 51, a first guide rail mechanism 52, a sliding mounting base 53 and a rail clamp 54. The two abutting hollow connecting tubes 2 are located inside the first guide rail mechanism 52. The sliding mounting base 53 is slidably connected to the first guide rail mechanism 52. The sliding mounting base 53 is provided with a welding robot 51. The welding robot 51 welds the two abutting hollow connecting tubes 2 together. The rear end of the sliding mounting base 53 is provided with a rail clamp 54. The rail clamp 54 fixes the sliding mounting base 53 and the first guide rail mechanism 52 to prevent the sliding mounting base 53 from sliding. Movable wheels and multiple electrical parts are installed in the sliding mounting base 53.

[0029] The first guide rail mechanism 52 includes two semi-annular first guide rails 521, four flanges 522, a first support column 523, a second support column 524, a threaded rod 525, a drive motor 526, a second guide rail 527, two sliders 528, a support plate 529, a plurality of hydraulic cylinders 5210 and a support base 5211. Two opposing hollow connecting pipes 2 are located inside the two semi-annular first guide rails 521. The outer wall of each semi-annular first guide rail 521 is respectively connected to two flanges 522. The two contacting flanges 522 are threadedly connected by bolts, nuts and other parts, thereby increasing the stability of the two semi-annular first guide rails 521. The bolts, nuts and other parts can be freely disassembled, and the installation is simple and convenient. The outer walls of the two semi-annular first guide rails 521 are respectively connected to the first support column 523 and the second support column 524. The lower surface of the second support column 524 is connected On the inner bottom surface of the second guide rail 527, two sliders 528 are provided at the lower end of the first support column 523, and the two sliders 528 are slidably connected to the second guide rail 527. The two sliders 528 can enable the first support column 523 to move in the direction of the second guide rail 527. The lower surface of the first support column 523 contacts the inner bottom surface of the second guide rail 527. The first support column 523 is threadedly connected to the spiral end of the threaded rod 525, and the unthreaded end of the threaded rod 525 is rotatably connected to the second support column 524. The threaded rod 525 is connected to the output end of the drive motor 526, and the fixed end of the drive motor 526 is arranged on the upper surface of the support plate 529. The upper surface of the support plate 529 is connected to the second guide rail 527, and the lower surface of the support plate 529 is connected to the telescopic rods of multiple hydraulic cylinders 5210, and the fixed ends of the multiple hydraulic cylinders 5210 are connected to the inner bottom surface of the support base 5211.

[0030] A threaded hole is provided on each pressing block of the pneumatic internal joint device 6, and the pressing block of the pneumatic internal joint device 6 is connected to the semi-annular support plate 9 through a thread. The semi-annular support plate 9 is tightly attached to the inner wall of the hollow connecting tube 2. A mounting groove is provided on the semi-annular support plate 9, and a plurality of threaded holes are provided in the mounting groove. Each screw is located in the mounting groove, so that the semi-annular support plate 9 is completely attached to the inner wall of the hollow connecting tube 2, thereby preventing the hollow connecting tube 2 from deforming during the riveting process.

[0031] The pipeline body 1 is composed of a first steel pipe 11, a polyurethane foam layer 12, a second steel pipe 13, an anti-corrosion insulation layer 14 and a concrete counterweight layer 15. Two hollow connecting pipes 2 are connected to the first steel pipe 11. The two hollow connecting pipes 2 and the first steel pipe 11 are interconnected. The outer wall of the first steel pipe 11 is connected to the second steel pipe 13. A polyurethane foam layer 12 is provided between the first steel pipe 11 and the second steel pipe 13. The polyurethane foam layer 12 has a good thermal insulation effect. The outer wall of the second steel pipe 13 is provided with an anti-corrosion insulation layer 14.

[0032] Multiple support frames 4 are provided with clamps to stabilize the pipeline body 1; the outer wall of the pipeline body 1 is connected to a concrete counterweight layer 15 to increase the weight of the pipeline body 1, facilitate the sinking of the pipeline body 1 to the seabed, and increase the stability of the overall pipeline line; multiple support frames 4 are provided with anti-slip pads, which are in contact with the concrete counterweight layer 15, increase the friction force and stabilize the pipeline body 1.

[0033] Working principle: In order to strengthen the stability of the welding of the two pipe bodies 1, the connection process is divided into a welding process and a riveting process, the welding process is performed first and then the riveting process;

[0034] Welding process: first, use a crane to lift two pipe bodies 1 to be welded onto multiple support frames 4, then use a cart to push the two pipe bodies 1 to be welded together, then use a crane to place the pneumatic internal joint device 6 inside the two pipe bodies 1 to be welded, control the position of the pneumatic internal joint device 6 through the traction rope at the upper end of the pneumatic internal joint device 6, open the pneumatic internal joint device 6 to fix the two pipe bodies 1 to be welded to each other, then move the support base 5211 below the joint of the two pipe bodies 1 to be welded, and start multiple hydraulic cylinders 5210 at the same time, and the multiple hydraulic cylinders 5210 drive the support plate 529 to do an upward movement until the two semi-annular first guide rails 52 1 is moved to an appropriate position, and then the driving motor 526 is started. The driving motor 526 drives the threaded rod 525 to rotate. At this time, the first support column 523 drives the corresponding semi-circular first guide rail 521 to approach the other semi-circular first guide rail 521 until the flanges 522 on the two semi-circular first guide rails 521 are in close contact with each other, and then the flanges 522 in close contact with each other are fixed to each other using bolts and nuts, and then the rail clamp 54 is closed, and at the same time, the movable wheel in the sliding mounting base 53 drives the mounting base 53 and the welding robot 51 to make a circular motion around the two semi-circular first guide rails 521, and at the same time, the welding robot 51 welds the abutting parts of the two hollow connecting pipes 2;

[0035] Riveting process: after the welding is completed and cooled, the pneumatic inner joint device 6 is taken out from the pipe body 1 by the traction rope, and a semi-circular support plate 9 is installed on the pressure block of the pneumatic inner joint device 6, and then the pneumatic inner joint device 6 is placed inside the pipe body 1, so that the semi-circular support plate 9 is close to the inner wall of the hollow connecting pipe 2 to be riveted, and the thickened plate 7 is placed on the outer walls of the two hollow connecting pipes 2 to be riveted, and then the thickened plate 7 is riveted with a rivet gun, and all the rivets 10 are driven into the rivet holes 3 of the thickened plate 7 and the hollow connecting pipe 2, and the pneumatic inner joint device 6 is rotated to change the position of the semi-circular support plate 9 so that the semi-circular support plate 9 is close to the rivet holes 3 to be riveted, leaving only one rivet hole 3 located at the top of each hollow connecting pipe 2, and then the thermal insulation mortar is poured into the two hollow connecting pipes 2 through the rivet hole 3, and after completion, the remaining rivet holes 3 are sealed with rivets 10, and then the pneumatic inner joint device 6 is taken out from the pipe body 1.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A submarine pipeline connection structure, comprising a pipeline body (1), It is characterized in that Hollow connecting pipes (2) are provided at both ends of the pipe body (1), and a plurality of rivet holes (3) are evenly provided on the upper surface of the hollow connecting pipe (2), and the plurality of rivet holes (3) are connected to the hollow part of the hollow connecting pipe (2). The front end of the hollow connecting pipe (2) is chamfered, and the outer walls of the two abutting pipe bodies (1) are in contact with a plurality of support frames (4). A welding assembly for welding the two pipe bodies (1) is provided at the abutting part of the two hollow connecting pipes (2), and a pneumatic inner joint device (6) is tightly attached to the inner walls of the two pipe bodies (1). The upper surfaces of the two abutting hollow connecting pipes (2) are connected to two thickened plates (7) by a plurality of rivets (10), and the hollow connecting pipes (2) are filled with thermal insulation mortar; The welding assembly comprises a welding robot (51), a first guide rail mechanism (52), a sliding mounting base (53) and a rail clamp (54); the two abutting hollow connecting pipes (2) are located inside the first guide rail mechanism (52); the sliding mounting base (53) is slidably connected to the first guide rail mechanism (52); the welding robot (51) is arranged on the sliding mounting base (53); the rear end of the sliding mounting base (53) is provided with the rail clamp (54); and movable wheels and a plurality of electrical parts are installed inside the sliding mounting base (53); A threaded hole is provided on each pressing block of the pneumatic internal joint device (6), and the pressing block of the pneumatic internal joint device (6) is connected to a semi-annular support plate (9) via a thread, and the semi-annular support plate (9) is closely attached to the inner wall of the hollow connecting tube (2); The outer wall of the pipeline body (1) is connected to a concrete counterweight layer (15).

2. A submarine pipeline connection structure according to claim 1, It is characterized in that The first guide rail mechanism (52) comprises two semi-annular first guide rails (521), four flanges (522), a first support column (523), a second support column (524), a threaded rod (525), a drive motor (526), ​​a second guide rail (527), two sliders (528), a support plate (529), a plurality of hydraulic cylinders (5210) and a support base (5211); the two abutting hollow connecting pipes (2) are located inside the two semi-annular first guide rails (521); the outer wall of each semi-annular first guide rail (521) is respectively connected to the two flanges (522); the two contacting flanges (522) are threadedly connected via bolt and nut parts; the outer walls of the two semi-annular first guide rails (521) are respectively connected to the first support column (523) and the second support column (524); the lower surface of the second support column (524) is connected to the inner bottom surface of the second guide rail (527); The lower end of the first support column (523) is provided with two sliding blocks (528), the two sliding blocks (528) are slidably connected to the second guide rail (527), the lower surface of the first support column (523) is in contact with the inner bottom surface of the second guide rail (527), the first support column (523) is threadedly connected to the spiral end of the threaded rod (525), the unthreaded end of the threaded rod (525) is rotatably connected to the second support column (524), the threaded rod (525) is connected to the output end of the drive motor (526), ​​the fixed end of the drive motor (526) is provided on the upper surface of the support plate (529), the upper surface of the support plate (529) is connected to the second guide rail (527), the lower surface of the support plate (529) is connected to the telescopic rods of the plurality of hydraulic cylinders (5210), and the fixed ends of the plurality of hydraulic cylinders (5210) are connected to the inner bottom surface of the support base (5211).

3. A submarine pipeline connection structure according to claim 1, It is characterized in that The pipeline body (1) is composed of a first steel pipe (11), a polyurethane foam layer (12), a second steel pipe (13) and an anti-corrosion insulation layer (14); the two hollow connecting pipes (2) are connected to the first steel pipe (11); the two hollow connecting pipes (2) and the first steel pipe (11) are interconnected; the outer wall of the first steel pipe (11) is connected to the second steel pipe (13); a polyurethane foam layer (12) is provided between the first steel pipe (11) and the second steel pipe (13); and the outer wall of the second steel pipe (13) is provided with the anti-corrosion insulation layer (14).

4. A submarine pipeline connection structure according to claim 1, It is characterized in that A plurality of support frames (4) are provided with clamps.

5. A submarine pipeline connection structure according to claim 1, It is characterized in that Anti-skid pads are provided on the plurality of support frames (4), and the anti-skid pads are in contact with the concrete counterweight layer (15).

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