Anti-stress marine pipeline and laying method

Abstract

The invention relates to the technical field of pipelines, in particular to an anti-stress marine pipeline and a laying method. According to the technical scheme, end pipes at the two ends of the pipe sleeve are fixed, outer supporting devices and energy recovery devices which are located outside corrugated pipes are arranged on the two sides of the pipe sleeve located at the outlet end, and inner supporting devices located in the corrugated pipes are arranged on the two sides of an inner pipe. According to the energy recovery device, operation can be conducted from the exterior and the interior of the corrugated pipe through the outer supporting plate and the inner supporting plate correspondingly, so that wave crests and wave troughs of the corrugated pipe are moved correspondingly, stress can be eliminated, normal extension of the corrugated pipe is guaranteed, and the energy recovery device recovers and converts energy generated by the corrugated pipe; and the outer supporting plate and the inner supporting plate can be driven to work.

Description

[0001] The invention relates to the technical field of pipelines, and in particular to an anti-stress marine pipeline and a laying method thereof. Background Art

[0002] The document with the publication number "CN1030467A" points out that for the pressure pipeline installed in the rock formation, a cavity is excavated in the rock to construct a bend, a concrete component is arranged in the cavity, the pipeline passes through it and forms a bend in it, and a slurry pressure medium is injected between the component and the rock formation cavity wall to generate an inward pressure acting on the component. The component has a predetermined shape and only has an outer surface adjacent to the concave edge of the bend. The outer surface is straight or concave in the longitudinal section along the direction of the pipeline, so as to minimize or eliminate the stress on the inner surface of the component.

[0003] In the field of marine engineering, this type of pipeline is responsible for the key task of transporting various fluids such as seawater, oil, and natural gas in a huge and complex pipeline system. However, the marine environment is synonymous with harshness and complexity, which poses severe challenges to pipelines and their environment in many aspects. First of all, there are continuous and changeable waves and currents in the ocean, and existing marine pipelines have many shortcomings when dealing with such a complex stress environment. The structural design of some pipelines is relatively simple and cannot effectively disperse and absorb various stresses, resulting in stress concentration in certain key areas, which greatly shortens the service life of pipelines. Summary of the invention

[0004] The purpose of the present invention is to provide a stress-resistant marine pipeline and a laying method thereof in view of the problems existing in the background technology.

[0005] The technical solution of the present invention is as follows: a stress-resistant marine pipeline, comprising a pipeline body consisting of a bellows and an inner pipe, the inner pipe is located in the bellows, the two ends of the bellows are respectively the inlet end and the outlet end of the fluid in the pipeline, the inlet end and the outlet end are both provided with end pipes fixedly connected to the bellows, the inner pipe is fixedly connected to the end pipe at the inlet end, and is characterized in that the end pipes at both ends are fixed with pipe sleeves, both sides of the pipe sleeve located at the outlet end are provided with external support devices and energy recovery devices located outside the bellows, and both sides of the inner pipe are provided with internal support devices located inside the bellows; The outer support device includes a plurality of bases installed at intervals on the crests of the corrugated pipe portion, the bases are hinged with outer support plates, the inner support device includes a plurality of inner support plates installed at intervals in the troughs of the corrugated pipe portion, the inner support plate is located between two adjacent outer support plates, the outer support plates and the inner support plates are both arranged vertically to the ground where the corrugated pipe is installed, and the plurality of outer support plates and the inner support plates are all arranged along the forward direction of the fluid in the pipeline and away from the outlet end of the pipeline; The energy recovery device includes an oil cylinder fixed on the pipe sleeve, and also includes a push plate fixed on a wave crest of the corrugated pipe, the push plate is arranged near the outlet end of the pipeline, a force-bearing rod hinged to the push plate is provided on the first side of the oil cylinder, and an output rod driving a plurality of outer support plates to move is provided on the second side of the oil cylinder, the output rod includes an extension rod located on the third side of the oil cylinder, the extension rod drives a plurality of inner support plates to move, and the plurality of outer support plates and the inner support plates all move in the forward direction of the fluid.

[0006] Preferably, the external support device includes a mounting shell fixed on the pipe sleeve at the outlet end, the mounting shell includes a vertical shell, a drive shaft is rotatably mounted inside the mounting shell and the vertical shell, a plurality of drive threads are provided on the drive shaft, an external support plate is threadedly mounted on the drive thread, a gear located in the vertical shell is fixedly mounted on the drive shaft, the gear is meshed with a tooth plate, and the end of the tooth plate is fixedly connected to the output rod.

[0007] Preferably, the top of the outer support plate is slidably connected to the mounting shell, and the tooth plate is slidably connected to the vertical shell wall.

[0008] Preferably, the inner support device includes a frame fixed on the inner tube, an inner frame is fixedly installed in the frame, a plurality of arc grooves are opened on the inner frame, a slider is fixedly installed in the middle of the inner support plate, the slider is slidably installed in the arc groove, the bottom of the inner support plate is rotatably installed on the frame, and a trough arc head is fixedly installed on the top of the inner support plate, and the trough arc head is located in the trough of the corrugated tube.

[0009] Preferably, a same metal pull rope is fixed between the tops of several inner support plates, a limit roller is rotatably installed in the frame, and the metal pull rope is fixedly connected to the bottom of the limit roller and the extension rod.

[0010] Preferably, the pipe sleeve is fixedly mounted with a flange, ear plates are fixed on both sides of the end pipe, a support rod is slidably mounted between the two ear plates on the same side, and a nut is threadedly mounted on the support rod.

[0011] Preferably, the ear plate is provided with an extension portion, an auxiliary rod is fixedly installed between the extension portions on the same side, a stabilizing ring is fixedly installed on the outer support plate, and the auxiliary rod is arranged to penetrate the stabilizing ring.

[0012] A method for laying a stress-resistant marine pipeline comprises the following steps: S1: Weld the outer support device to the pipe sleeve, weld several bases at intervals on some wave crests of the corrugated pipe, hinge the base and the outer support plate, and weld the inner support device to the surface of the inner pipe; S2: inserting the inner tube into the corrugated tube, inserting a plurality of inner support plates into the troughs between adjacent outer support plates, and then welding and fixing the inner tube and the end tube at the inlet end; S3: Weld the oil cylinder to the pipe sleeve, fix the push plate and the wave crest near the outlet end of the pipe by welding, and connect the extension rod and the supporting device; S4: Align the flange of the sleeve with the flange of the pipe at the connection and install it with bolts.

[0013] Compared with the existing technology, the beneficial effects of the present invention are: the present invention respectively arranges an outer supporting device and an inner supporting device inside and outside the bellows, and the outer supporting plate and the inner supporting plate can be operated from the outside and inside of the bellows respectively, so that the crests and troughs of the bellows are moved respectively, thereby eliminating stress and ensuring its normal extension, and the energy recovery device recovers and converts the energy generated by the bellows, so that the outer supporting plate and the inner supporting plate can be driven to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 It is a schematic structural diagram of the inner support device of the present invention; Figure 4 It is a schematic structural diagram of the external support device of the present invention; Figure 5 is a schematic cross-sectional structure diagram of the energy recovery device of the present invention; Figure 6 It is a schematic diagram of the top structure of the present invention.

[0015] Figure numerals: 1. bellows; 2. end pipe; 3. pipe sleeve; 4. inner pipe; 5. outer support device; 6. energy recovery device; 7. inner support device; 8. ear plate; 9. support rod; 10. nut; 11. auxiliary rod; 12. stabilizing ring; 51. mounting shell; 52. drive shaft; 53. drive thread; 54. outer support plate; 55. base; 56. vertical shell; 57. gear; 58. tooth plate; 61. cylinder; 62. output rod; 63. load-bearing rod; 64. extension rod; 65. push plate; 71. frame; 72. inner frame; 73. inner support plate; 74. arc groove; 75. slider; 76. limit roller; 77. metal pull rope; 78. trough arc head. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] See attached Figure 1-6, a stress-resistant marine pipeline, comprising a pipeline body consisting of a bellows 1 and an inner pipe 4, the inner pipe 4 is located in the bellows 1, the two ends of the bellows 1 are respectively the inlet end and the outlet end of the fluid in the pipeline, the inlet end and the outlet end are both provided with an end pipe 2 fixedly connected to the bellows 1, the inner pipe 4 is fixedly connected to the end pipe 2 at the inlet end, the end pipes 2 at both ends are fixed with a pipe sleeve 3, both sides of the pipe sleeve 3 located at the outlet end are provided with an external support device 5 and an energy recovery device 6 located outside the bellows 1, and both sides of the inner pipe 4 are provided with an internal support device 7 located inside the bellows 1; The outer support device 5 includes a plurality of bases 55 installed at intervals on the crests of the corrugated pipe 1, and the base 55 is hinged with an outer support plate 54. The inner support device 7 includes a plurality of inner support plates 73 installed at intervals in the troughs of the corrugated pipe 1, and the inner support plate 73 is located between two adjacent outer support plates 54. The outer support plates 54 and the inner support plates 73 are both arranged vertically to the ground where the corrugated pipe 1 is installed. The plurality of outer support plates 54 and the inner support plates 73 are all arranged along the forward direction of the fluid in the pipeline and away from the outlet end of the pipeline. like Figure 2 and Figure 3 As shown in the figure, arrow A represents the direction of fluid flow. Figure 2 It can be seen that one end of the inner tube 4 is fixedly connected to the end tube 2 at the inlet end. When in use, the bellows 1 is extended in the direction of the fluid advance. The end of the fixed inner tube 4 can be called the rear telescopic end, and the other end can be called the front telescopic end. The fluid direction is from the rear telescopic end to the front telescopic end. It should be noted that this is a common pipeline structure and function in this technology. It should also be noted that when the existing pipeline is in use, because the fluid advances in the direction from the rear telescopic end to the front telescopic end, the expansion stress is often concentrated in the rear telescopic end. When stress concentration occurs, this part often does not stretch. In this solution, it can be seen from the figure that the outer support plate 54 and the inner support plate 73 are both arranged from the pipeline inlet end to the outlet end, which is arranged along the fluid advance direction. It can also be understood that it is arranged from the rear telescopic end to the front telescopic end. During operation, the outer support plate 54 can pull the wave crest from the outside, and the inner support plate 73 can push the wave trough from the inside, which will cause the wave crest and wave trough of the rear telescopic end to stretch, and the stress can be eliminated after stretching. In addition, the outer support plates 54 and the inner support plates 73 are spaced apart from each other and arranged inside and outside the bellows 1 to ensure to the greatest extent that each wave crest and wave trough can eliminate stress and stretch, and avoid conflict between adjacent outer support plates 54 and inner support plates 73.

[0018] The energy recovery device 6 includes a cylinder 61 fixed on the pipe sleeve 3, and also includes a push plate 65 fixed on a wave crest of the corrugated pipe 1. The push plate 65 is arranged near the outlet end of the pipeline. A force-bearing rod 63 hinged to the push plate 65 is provided on the first side of the cylinder 61. An output rod 62 for driving a plurality of outer support plates 54 to move is provided on the second side of the cylinder 61. The output rod 62 includes an extension rod 64 located on the third side of the cylinder 61. The extension rod 64 drives a plurality of inner support plates 73 to move. The plurality of outer support plates 54 and the inner support plates 73 all move in the forward direction of the fluid.

[0019] like Figure 2 As shown, the push plate 65 is fixed on the second wave crest near the outlet end in this embodiment, because the wave crest at the outlet end tends to move first, and the movement is characterized by rapid and wide-range extension, so the push plate 65 is fixed there to ensure that the extension force of the bellows 1 is recovered most quickly and to the maximum extent; like Figure 5 As shown in the figure, arrow B represents the moving direction of the output rod 62 and the extension rod 64. When the bellows 1 is extended, the push plate 65 moves with the wave crest there, so that the push plate 65 will push the force-bearing rod 63 to squeeze the oil cylinder 61, so that the output rod 62 moves. The movement of the output rod 62 will drive the extension rod 64 to move, so that the outer support plate 54 and the inner support plate 73 will both move in the direction of fluid advance, so that the wave crest and trough at the rear telescopic end part are extended through the movement of the two, thereby eliminating stress and ensuring normal expansion and contraction at this place. In addition, this method can recover and convert energy.

[0020] Specifically, the outer support device 5 includes a mounting shell 51 fixed on the pipe sleeve 3 at the outlet end, the mounting shell 51 includes a vertical shell 56, a driving shaft 52 is rotatably mounted in the mounting shell 51 and the vertical shell 56, a plurality of driving threads 53 are provided on the driving shaft 52, an outer support plate 54 is threadedly mounted on the driving thread 53, a gear 57 located in the vertical shell 56 is fixedly mounted on the driving shaft 52, a toothed plate 58 is meshed with the gear 57, the end of the toothed plate 58 is fixedly connected to the output rod 62, the top of the outer support plate 54 is slidably connected to the mounting shell 51, and the toothed plate 58 is slidably connected to the wall of the vertical shell 56; When the pipeline is in use, the bellows 1 will extend from the outlet end of the pipeline, so that the push plate 65 moves with the extension of the bellows 1. The push plate 65 pushes the force rod 632 to move into the oil cylinder 61 during the movement. The hydraulic oil in the oil cylinder 61 is squeezed, so that the hydraulic oil will push the output rod 62 to move. The movement of the output rod 62 will push the tooth plate 58 to move. The tooth plate 58 will engage the gear 57 to rotate during the movement, thereby rotating the drive shaft 52. When the drive shaft 52 rotates, several outer support plates 54 will move on the driving thread 53 in the direction of fluid advancement, and the outer support plate 54 will pull the base 55 when it moves, thereby pulling the wave crest near the rear telescopic end to move in the direction of fluid advancement, so that the stress there will be eliminated and it will stretch normally.

[0021] In addition, the inner support device 7 includes a frame body 71 fixed on the inner tube 4, an inner frame 72 is fixedly installed in the frame body 71, a plurality of arc grooves 74 are provided on the inner frame 72, a slider 75 is fixedly installed in the middle of the inner support plate 73, the slider 75 is slidably installed in the arc groove 74, the bottom of the inner support plate 73 is rotatably installed on the frame body 71, a trough arc head 78 is fixedly installed on the top of the inner support plate 73, the trough arc head 78 is located in the trough of the corrugated tube 1, the same metal pull rope 77 is fixed between the tops of the plurality of inner support plates 73, a limit roller 76 is rotatably installed in the frame body 71, and the metal pull rope 77 is fixedly connected to the extension rod 64 through the bottom of the limit roller 76; When the pipeline is in use, the bellows 1 will extend from the outlet end of the pipeline, so that the push plate 65 moves with the extension of the bellows 1. The push plate 65 pushes the force-bearing rod 63 to move into the oil cylinder 61 during the movement. The hydraulic oil in the oil cylinder 61 is squeezed, so that the hydraulic oil will push the output rod 62 to move. The movement of the output rod 62 will drive the extension rod 64 to move, so that the extension rod 64 pulls the metal pull rope 77. The metal pull rope 77 will pull several inner support plates 73 through the limit of the limit roller 76. The inner support plate 73 will rotate with its bottom fulcrum. The rotating inner support plate 73 will cause the trough arc head 78 on its top to push the trough of the bellows 1, so that the trough can move in the direction of the fluid forward, so that the stress at this point is eliminated and it can stretch normally.

[0022] The outer support plate 54 and the inner support plate 73 can be used to operate from the outside and the inside of the bellows 1 respectively, so that the crest and the trough of the bellows 1 can be moved respectively, thereby eliminating stress and ensuring its normal extension; When the bellows 1 contracts, the bellows 1 will start to contract from the outlet end, which will drive the push plate 65 to move back, so that the push plate 65 can pull the force rod 63 to move, so that the hydraulic oil in the oil cylinder 61 flows back, so that the output rod 62 moves back, and the output rod 62 moves back, which will drive the tooth plate 58 to move back, so that the meshing gear 57 rotates in the opposite direction, and the gear 57 will drive the drive shaft 52 to rotate in the opposite direction, so that the outer support plate 54 moves in the opposite direction, so that the wave crest of the bellows 1 will be pulled in the opposite direction, so that the bellows 1 contracts; When the output rod 62 moves back, it will drive the extension rod 64 to move back, so that the force of the extension rod 64 pulling the metal pull rope 77 disappears, and the metal pull rope 77 no longer pulls the inner support plate 73, so that the force of the trough arc head 78 pushing the trough disappears. Then, as the bellows 1 contracts, the trough of the bellows 1 will also contract due to the absence of the thrust of the trough arc head 78, and the contraction generates a return thrust, so that the trough arc head 78 resets the inner support plate 73.

[0023] It should also be noted that, in this embodiment, Figure 1 and 6 As shown, the pipe sleeve 3 is fixedly installed with a flange, and ear plates 8 are fixed on both sides of the end pipe 2. A support rod 9 is slidably installed between the two ear plates 8 on the same side, and a nut 10 is threadedly installed on the support rod 9, thereby forming a mounting bracket for the pipeline. During installation, the flange and the pipeline can be connected. The stability of the pipeline is ensured by the mounting bracket, and the pipeline will move along the support rod 9, and the support rod 9 plays a guiding role.

[0024] In addition, the ear plate 8 is provided with an extension portion, and an auxiliary rod 11 is fixedly installed between the extension portions on the same side. A stabilizing ring 12 is fixedly installed on the outer support plate 54, and the auxiliary rod 11 passes through the stabilizing ring 12. Through this arrangement, it is ensured that the stabilizing ring 12 can limit the movement of the outer support plate 54 when it moves. It needs to move along the auxiliary rod 11, which ensures the stability of the movement of the outer support plate 54. Moreover, the stabilizing ring 12 itself wraps the pipe, which can improve the structural strength of the mounting bracket.

[0025] The present invention also discloses a method for laying a stress-resistant marine pipeline, comprising the following steps: S1: Weld the outer support device 5 to the pipe sleeve 3, weld a plurality of bases 55 at intervals to some crests of the corrugated pipe 1, then hinge the base 55 and the outer support plate 54, and weld the inner support device 7 to the surface of the inner pipe 4; S2: insert the inner tube 4 into the corrugated tube 1, insert a plurality of inner support plates 73 into the troughs between adjacent outer support plates 54, and then weld and fix the inner tube 4 and the end tube 2 at the inlet end; S3: Weld the oil cylinder 61 to the pipe sleeve 3, fix the push plate 65 and the wave soldering near the outlet end of the pipeline, and connect the extension rod 64 and the support device 7; S4: Align the flange fixed to the pipe sleeve 3 with the flange of the pipe at the connection, and install them with bolts.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A stress-resistant marine pipeline, characterized in that: The invention comprises a pipeline body composed of a bellows (1) and an inner tube (4), wherein the inner tube (4) is located inside the bellows (1), and the two ends of the bellows (1) are respectively the inlet end and the outlet end of the fluid in the pipeline, and the inlet end and the outlet end are both provided with an end tube (2) fixedly connected to the bellows (1), the inner tube (4) is fixedly connected to the end tube (2) at the inlet end, and the end tubes (2) at both ends are fixedly provided with a pipe sleeve (3), and both sides of the pipe sleeve (3) located at the outlet end are provided with an external support device (5) and an energy recovery device (6) located outside the bellows (1), and both sides of the inner tube (4) are provided with an internal support device (7) located inside the bellows (1); The outer support device (5) comprises a plurality of bases (55) installed at intervals on the crests of the corrugated pipe (1), the bases (55) being hingedly connected to an outer support plate (54), the inner support device (7) comprising a plurality of inner support plates (73) installed at intervals in the troughs of the corrugated pipe (1), the inner support plate (73) being located between two adjacent outer support plates (54), the outer support plates (54) and the inner support plates (73) being arranged perpendicular to the ground at the location where the corrugated pipe (1) is installed, and the plurality of outer support plates (54) and the inner support plates (73) are arranged along the advancing direction of the fluid in the pipeline and away from the outlet end of the pipeline; The energy recovery device (6) comprises an oil cylinder (61) fixed on the pipe sleeve (3), and also comprises a push plate (65) fixed on a wave crest of the corrugated pipe (1), the push plate (65) being arranged close to the outlet end of the pipeline, a force-bearing rod (63) hinged to the push plate (65) being arranged on the first side of the oil cylinder (61), an output rod (62) for driving a plurality of outer support plates (54) to move being arranged on the second side of the oil cylinder (61), the output rod (62) comprising an extension rod (64) located on the third side of the oil cylinder (61), the extension rod (64) driving a plurality of inner support plates (73) to move, and the plurality of outer support plates (54) and the inner support plates (73) all move in the forward direction of the fluid.

2. The stress-resistant marine pipeline according to claim 1, characterized in that: The outer support device (5) comprises a mounting shell (51) fixed on the pipe sleeve (3) at the outlet end, the mounting shell (51) comprising a vertical shell (56), a drive shaft (52) rotatably mounted in the mounting shell (51) and the vertical shell (56), a plurality of drive threads (53) being provided on the drive shaft (52), an outer support plate (54) being threadedly mounted on the drive threads (53), a gear (57) located in the vertical shell (56) being fixedly mounted on the drive shaft (52), the gear (57) being meshed with a toothed plate (58), the end of the toothed plate (58) being fixedly connected to the output rod (62).

3. The stress-resistant marine pipeline according to claim 2, characterized in that: The top of the outer support plate (54) is slidably connected to the mounting shell (51), and the tooth plate (58) is slidably connected to the wall of the vertical shell (56).

4. The stress-resistant marine pipeline according to claim 1, characterized in that: The inner support device (7) comprises a frame body (71) fixed on the inner tube (4), an inner frame (72) fixedly mounted in the frame body (71), a plurality of arc-shaped grooves (74) being provided on the inner frame (72), a slider (75) fixedly mounted in the middle of the inner support plate (73), the slider (75) being slidably mounted in the arc-shaped groove (74), the bottom of the inner support plate (73) being rotatably mounted on the frame body (71), a trough arc head (78) fixedly mounted on the top of the inner support plate (73), the trough arc head (78) being located in the trough of the corrugated tube (1).

5. The stress-resistant marine pipeline according to claim 4, characterized in that: A common metal pull rope (77) is fixed between the tops of the plurality of inner support plates (73), a limit roller (76) is rotatably installed in the frame (71), and the metal pull rope (77) is fixedly connected to the bottom of the limit roller (76) and the extension rod (64).

6. The stress-resistant marine pipeline according to claim 1, characterized in that: The pipe sleeve (3) is fixedly mounted with a flange, and ear plates (8) are fixedly mounted on both sides of the end pipe (2). A support rod (9) is slidably mounted between the two ear plates (8) on the same side, and a nut (10) is threadedly mounted on the support rod (9).

7. The stress-resistant marine pipeline according to claim 6, characterized in that: The ear plate (8) is provided with an extension portion, an auxiliary rod (11) is fixedly mounted between the extension portions on the same side, a stabilizing ring (12) is fixedly mounted on the outer support plate (54), and the auxiliary rod (11) is arranged to penetrate the stabilizing ring (12).

8. A method for laying a stress-resistant marine pipeline, using the stress-resistant marine pipeline according to claim 6, characterized in that: The steps include: S1: welding the outer support device (5) to the pipe sleeve (3), welding a plurality of bases (55) at intervals to some of the wave crests of the corrugated pipe (1), hingedly connecting the base (55) and the outer support plate (54), and welding the inner support device (7) to the surface of the inner pipe (4); S2: inserting the inner tube (4) into the corrugated tube (1), inserting a plurality of inner support plates (73) into the troughs between adjacent outer support plates (54), and then welding the inner tube (4) and the end tube (2) at the inlet end to fix them; S3: Weld the oil cylinder (61) to the pipe sleeve (3), fix the push plate (65) and the wave welding near the outlet end of the pipeline, and connect the extension rod (64) and the support device (7); S4: Align the flange of the sleeve (3) with the flange of the pipe at the connection point and install them with bolts.

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