Suspended critical pressure difference experimental device for pipeline scouring on muddy seabed

Abstract

The invention discloses a muddy seabed pipeline scouring suspended critical pressure difference experiment device, and particularly relates to the technical field of seabed pipeline pressure difference experiments, the muddy seabed pipeline scouring suspended critical pressure difference experiment device comprises a reinforcing support ring, a support detection experiment assembly is arranged on the reinforcing support ring, and the support detection experiment assembly comprises a simulation water sump arranged on the outer side of the reinforcing support ring. According to the device, the condition that the pipeline is installed in the seabed can be simulated through the simulation water sump, the reinforcing butt-joint flow guide head can be stressed due to the fact that the triangular flow guide cover is scoured by a high-pressure medium, then the reinforcing butt-joint flow guide head can drive the pipeline to shake, and the stress condition of the pipeline for conveying the medium in the seabed is simulated; the deflection angle of the reinforcing supporting ring is detected through the displacement sensor, then the stress condition of the pipeline in the seabed during scouring and medium conveying is detected, the pipeline scouring critical pressure difference can be detected more accurately, an important parameter basis is provided for design and construction of the submarine pipeline, and safe operation of the pipeline is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of seabed pipeline differential pressure experiments, and more specifically, to an experimental device for the critical differential pressure of pipeline scouring and suspension on a muddy seabed. Background Art

[0002] For exposed submarine pipelines, the suspension of the seabed at the bottom of the pipeline is mainly caused by the scouring and damage of seepage at the bottom of the seabed, and the seepage damage is closely related to the differential pressure on both sides of the pipeline. The critical differential pressure for the suspension of the seabed at the bottom of the pipeline at different exposed heights is not the same. Understanding the critical differential pressure for the suspension of the pipeline helps to evaluate the possibility of the suspension of the exposed pipeline, thereby providing technical support for the safety maintenance of the pipeline.

[0003] Among them, the patent with the publication number CN209589421U discloses an experimental device for the critical differential pressure of submarine pipeline scouring and suspension on a muddy seabed, including a water tank, a partition board, and a model pipe; the partition board is placed in the water tank, and both sides of the partition board are sealed with the side walls of the water tank. The model pipe is fixed at the bottom of the partition board, and both ends of the model pipe are sealed with the side walls of the water tank. The lowermost end of the side wall of the model pipe does not contact the bottom of the water tank. The bottom of the water tank is covered with muddy sand, and the bottom of the model pipe is buried in the muddy sand to isolate both sides of the partition board; When this structure is in use, water is continuously injected into the water tank on the left side of the partition board to raise the water level. When the water level is raised to a height H1 (H1 > H2), observe whether piping occurs at the root position on the right side of the model pipe. If it occurs, record the water level H1 on the left side at this time. Then, the differential water level H1 - H2 is the critical suspension pressure difference under the condition of the buried depth E of the model pipe. However, this structure is not easy to simulate the force and sway of the pipeline on the seabed during use, and it is not easy to accurately detect the critical differential pressure of pipeline scouring. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an experimental device for the critical differential pressure of pipeline scouring and suspension on a muddy seabed, aiming to solve the problems raised in the above background art.

[0005] The present invention provides the following technical solution: An experimental device for the critical differential pressure of pipeline scouring and suspension on a muddy seabed, including a strengthening support ring, and a support detection experiment component is arranged on the strengthening support ring; The support detection experiment component includes a simulated water tank arranged outside the strengthening support ring. A plurality of limiting support rods for lifting are fixedly arranged on the inner wall of the strengthening support ring, and a first strengthening connection ring body for lifting is rotatably connected to each of the limiting support rods. A second strengthening connection ring body for lifting is rotatably connected to the middle of the first strengthening connection ring body. A strengthening docking diversion head for docking with the pipeline is rotatably connected to the middle of the second strengthening connection ring body, and a strengthening frame body for support is fixedly arranged on the inner wall of the strengthening docking diversion head; A support seat is installed on the outside of the simulated sump through bolts. A displacement sensor for deflection detection is arranged on the support seat. A plurality of signal lights are arranged on the displacement sensor. A plurality of flow dividing plate bodies for support are installed on one side of the reinforcing frame body through bolts. Support pads are fixedly arranged on each of the flow dividing plate bodies. Guide plates are fixedly arranged on a plurality of the support pads. The shape of the guide plate is triangular. A flow guiding cavity for flow guiding is formed between two adjacent guide plates. A triangular flow guiding cover is clamped on the outside of the guide plate. One end of the support pad is fixedly provided with a limiting cross bar. The limiting cross bar penetrates through the triangular flow guiding cover and extends to the outside of the triangular flow guiding cover. The shape of the triangular flow guiding cover is triangular. The triangular flow guiding cover is clamped with the guide plate; It can be seen that in the above technical solution, when the reinforced docking flow guiding head shakes, it can drive the second reinforced connecting ring body to deflect on the first reinforced connecting ring body. The first reinforced connecting ring body can undergo appropriate displacement on the limiting support rod, so that the reinforced support ring is stressed and drives the limiting clamping plate and the docking shaft to rotate. When the docking shaft rotates, it drives the reinforced cylinder and the displacement sensor to rotate. The displacement sensor detects the deflection angle of the reinforced support ring, and then realizes the detection of the scouring of the pipeline in the seabed and the stress condition when transporting the medium. By simulating the shaking condition of the pipeline on the seabed, the critical pressure difference of pipeline scouring can be detected more accurately, providing an important parameter basis for the design and construction of submarine pipelines and helping to ensure the safe operation of the pipeline; Optionally, in a possible implementation manner, a converging head is fixedly arranged at one end of the reinforced docking flow guiding head. The converging head extends to the outside of the flow dividing plate body and is clamped with the flow dividing plate body. One end of the displacement sensor is fixedly provided with a reinforced cylinder. A limiting frame is rotatably connected to the outside of the reinforced cylinder. The limiting frame is located on the support seat and is detachably connected to the support seat through bolts. A clamping plate is fixedly arranged at one end of the limiting frame. A limiting sleeve is clamped in the clamping plate. The reinforced cylinder is located in the middle of the limiting sleeve. A docking shaft is rotatably connected to the middle of the limiting sleeve. A limiting clamping plate is fixedly arranged at one end of the docking shaft. One end of the docking shaft extends to the reinforced cylinder and is clamped with the reinforced cylinder. The limiting clamping plate extends to the reinforced support ring and is clamped with the reinforced support ring. A plurality of flow dividing holes are formed through the reinforced support ring; It can be seen that in the above technical solution, a pipeline is installed at the end of the enhanced docking flow guide head through a flange, and appropriate water and gravel, soil and impurity existing in the seabed are injected into the simulation water tank, so as to enable the simulation water tank to simulate the situation of the pipeline installed in the seabed. The medium is conveyed into the pipeline through the enhanced docking flow guide head, and the conveyed medium is gathered by the gathering head, so that the conveyed medium is in a state of high pressure and gathered together. The high-pressure medium is shunted through each diversion cavity and contacts the triangular diversion cover. Due to the fact that the triangular diversion cover is scoured by the high-pressure medium, the enhanced docking flow guide head can be stressed, and then the enhanced docking flow guide head can drive the pipeline to shake, realizing the stress condition of the simulated pipeline conveying the medium in the seabed.

[0006] The technical effects and advantages of the present invention are as follows: 1. In the present invention, a pipeline is installed at the end of the enhanced docking flow guide head through a flange, and appropriate water and gravel, soil and impurity existing in the seabed are injected into the simulation water tank, so as to enable the simulation water tank to simulate the situation of the pipeline installed in the seabed. By simulating the shaking situation of the pipeline on the seabed, the critical pressure difference of pipeline scouring can be detected more accurately, providing an important parameter basis for the design and construction of submarine pipelines and helping to ensure the safe operation of the pipelines; 2. In the present invention, the conveyed medium is gathered by the gathering head, so that the conveyed medium is in a state of high pressure and gathered together. The high-pressure medium is shunted through each diversion cavity and contacts the triangular diversion cover. Due to the fact that the triangular diversion cover is scoured by the high-pressure medium, the enhanced docking flow guide head can be stressed, and then the enhanced docking flow guide head can drive the pipeline to shake, realizing the stress condition of the simulated pipeline conveying the medium in the seabed; 3. When the enhanced docking flow guide head shakes, it can drive the second enhanced connection ring body to deflect on the first enhanced connection ring body, and the first enhanced connection ring body can undergo an appropriate displacement on the limit support rod, so that the enhanced support ring is stressed and drives the limit clamping plate and the docking shaft to rotate. When the docking shaft rotates, it drives the enhanced cylinder and the displacement sensor to rotate. The deflection angle of the enhanced support ring is detected by the displacement sensor, and then the stress condition of the pipeline scoured and conveying the medium in the seabed is detected; In summary, through the corresponding cooperation of each structure, the simulated sump can simulate the situation of the pipeline installed in the seabed. The reason that the triangular deflector is washed by the high-pressure medium causes the reinforced docking deflector head to be stressed, and then the reinforced docking deflector head can drive the pipeline to shake, realizing the stress situation of the simulated pipeline transporting the medium in the seabed. When the docking shaft rotates, it drives the reinforcing cylinder and the displacement sensor to rotate. The deflection angle of the reinforced support ring is detected by the displacement sensor, and then the stress situation of the pipeline being washed and transporting the medium in the seabed is detected. By simulating the shaking situation of the pipeline on the seabed, the critical pressure difference of pipeline erosion can be detected more accurately, providing an important parameter basis for the design and construction of subsea pipelines and helping to ensure the safe operation of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the present disclosure, the drawings required for use in some embodiments will be briefly introduced below. Obviously, the drawings in the following description are only the drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and do not limit the actual dimensions of the products, the actual processes of the methods, the actual timings of the signals, etc. involved in the embodiments of the present disclosure.

[0008] Figure 1 It is the front view of the overall structure of the present invention.

[0009] Figure 2 It is the side view of the overall structure of the present invention.

[0010] Figure 3 It is the three-dimensional view of the reinforced docking deflector head, the flow dividing plate body, the limiting cross bar and the triangular deflector of the present invention.

[0011] Figure 4 For the present invention Figure 3 is the cross-sectional view.

[0012] Figure 5 For the present invention Figure 4 is the three-dimensional view.

[0013] Figure 6 It is the three-dimensional view of the support seat, the limiting frame, the reinforcing cylinder, the displacement sensor, the limiting clamping plate, the limiting sleeve and the clamping plate of the present invention.

[0014] Figure 7 It is the three-dimensional view of the reinforced support ring, the limiting support rod, the docking shaft and the limiting clamping plate of the present invention.

[0015] The reference numerals are: 1, reinforcing support ring; 2, limiting support rod; 3, first reinforcing connection ring body; 4, second reinforcing connection ring body; 5, reinforcing butt joint flow guide head; 6, reinforcing frame body; 7, flow dividing plate body; 8, support backing plate; 9, flow guide plate; 10, limiting cross bar; 11, triangular flow guide cover; 12, converging head; 13, support seat; 14, limiting frame; 15, clamping plate; 16, limiting sleeve; 17, limiting clamping plate; 18, reinforcing cylinder; 19, displacement sensor; 20, docking shaft; 21, flow dividing hole; 22, signal lamp; 23, simulated water sump. Specific embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] As shown in the attached Figure 1 - Figure 7 For the experimental device for the critical pressure difference of pipeline scour and suspension on the muddy seabed, through the support detection experimental component arranged on the reinforcing support ring 1, and through the corresponding cooperation of each structure, the simulated water sump 23 can simulate the situation of the pipeline installed in the seabed. The reason for the triangular flow guide cover 11 to be scoured by the high-pressure medium causes the reinforcing butt joint flow guide head 5 to be stressed, and then the reinforcing butt joint flow guide head 5 can drive the pipeline to shake, realizing the stress situation of the simulated pipeline transporting the medium in the seabed. When the docking shaft 20 rotates, it drives the reinforcing cylinder 18 and the displacement sensor 19 to rotate. The displacement sensor 19 detects the deflection angle of the reinforcing support ring 1, and then realizes the detection of the stress situation of the pipeline being scoured and transporting the medium in the seabed. By simulating the shaking situation of the pipeline on the seabed, the critical pressure difference of pipeline scour can be detected more accurately, providing an important parameter basis for the design and construction of submarine pipelines, helping to ensure the safe operation of the pipeline, and the specific structural settings of the components are as follows; The support detection experimental component includes a simulated water sump 23 arranged outside the reinforcing support ring 1. A plurality of limiting support rods 2 for lifting are fixedly arranged on the inner wall of the reinforcing support ring 1, and a first reinforcing connection ring body 3 for lifting is rotatably connected to each limiting support rod 2. The middle part of the first reinforcing connection ring body 3 is rotatably connected to a second reinforcing connection ring body 4 for lifting. The middle part of the second reinforcing connection ring body 4 is rotatably connected to a reinforcing butt joint flow guide head 5 for docking with the pipeline. A reinforcing frame body 6 for support is fixedly arranged on the inner wall of the reinforcing butt joint flow guide head 5; A support base 13 is installed on the outside of the simulated water sump 23 by bolts. A displacement sensor 19 for deflection detection is arranged on the support base 13. A plurality of signal lights 22 are arranged on the displacement sensor 19. On one side of the strengthening frame body 6, a plurality of flow dividing plate bodies 7 for supporting are installed by bolts. And a support backing plate 8 is fixedly arranged on each flow dividing plate body 7. A flow guiding plate 9 is fixedly arranged on a plurality of support backing plates 8. The shape of the flow guiding plate 9 is set as a triangle. And a flow guiding cavity for guiding is formed between every two adjacent flow guiding plates 9. A triangular flow guiding cover 11 is clamped on the outside of the flow guiding plate 9. One end of the support backing plate 8 is fixedly provided with a limiting cross bar 10. The limiting cross bar 10 penetrates through the triangular flow guiding cover 11 and extends to the outside of the triangular flow guiding cover 11. The shape of the triangular flow guiding cover 11 is set as a triangle. The triangular flow guiding cover 11 is clamped with the flow guiding plate 9; One end of the strengthening butt joint flow guiding head 5 is fixedly provided with a gathering head 12. The gathering head 12 extends to the outside of the flow dividing plate body 7 and is clamped with the flow dividing plate body 7. One end of the displacement sensor 19 is fixedly provided with a strengthening cylinder 18. A limiting frame 14 is rotatably connected to the outside of the strengthening cylinder 18. The limiting frame 14 is located on the support base 13 and is detachably connected with the support base 13 by bolts. One end of the limiting frame 14 is fixedly provided with a clamping plate 15. A limiting sleeve 16 is clamped in the clamping plate 15. The strengthening cylinder 18 is located in the middle of the limiting sleeve 16. A butt joint shaft 20 is rotatably connected to the middle of the limiting sleeve 16. One end of the butt joint shaft 20 is fixedly provided with a limiting clamping plate 17. One end of the butt joint shaft 20 extends to the strengthening cylinder 18 and is clamped with the strengthening cylinder 18. The limiting clamping plate 17 extends to the strengthening support ring 1 and is clamped with the strengthening support ring 1. A plurality of flow dividing holes 21 are penetrated and opened on the strengthening support ring 1.

[0018] During use according to the above structure, the staff installs the device at a designated position. A pipeline is installed at the end of the strengthening butt joint flow guiding head 5 through a flange. And appropriate water and gravel, soil and impurities existing in the seabed are injected into the simulated water sump 23, so as to realize that the simulated water sump 23 can simulate the situation of installing the pipeline in the seabed; At the same time, high-pressure medium is conveyed into the pipeline through a water pump via the strengthening butt joint flow guiding head 5. The conveyed medium is gathered by the gathering head 12, so that the conveyed medium is in a state of being high-pressure and gathered together. The high-pressure medium is divided by each flow guiding cavity and contacts with the triangular flow guiding cover 11. Due to the fact that the triangular flow guiding cover 11 is washed by the high-pressure medium, the strengthening butt joint flow guiding head 5 can be stressed. Then the strengthening butt joint flow guiding head 5 can drive the pipeline to shake, so as to realize the stress situation of the simulated pipeline conveying medium in the seabed; When the enhanced docking deflector head 5 shakes, it can drive the second enhanced connection ring body 4 to deflect on the first enhanced connection ring body 3. The first enhanced connection ring body 3 can then undergo appropriate displacement on the limit support rod 2, causing the enhanced support ring 1 to be stressed and driving the limit clamping plate 17 and the docking shaft 20 to rotate. When the docking shaft 20 rotates, it drives the enhanced cylinder 18 and the displacement sensor 19 to rotate. The displacement sensor 19 detects the deflection angle of the enhanced support ring 1, thereby detecting the scouring of the pipeline in the seabed and the force on the pipeline when transporting the medium. By simulating the shaking of the pipeline on the seabed, the critical scouring pressure difference of the pipeline can be detected more accurately, providing an important parameter basis for the design and construction of submarine pipelines and helping to ensure the safe operation of the pipeline.

[0019] Different from the prior art, the present application discloses an experimental device for the critical scouring suspension pressure difference of pipelines on muddy seabeds. Through the simulation water tank 23, the situation of the pipeline installed in the seabed can be simulated. Due to the high-pressure medium scouring of the triangular deflector 11, the enhanced docking deflector head 5 can be stressed, and then the enhanced docking deflector head 5 can drive the pipeline to shake, realizing the simulation of the force on the pipeline when transporting the medium in the seabed. When the docking shaft 20 rotates, it drives the enhanced cylinder 18 and the displacement sensor 19 to rotate. The displacement sensor 19 detects the deflection angle of the enhanced support ring 1, thereby detecting the scouring of the pipeline in the seabed and the force on the pipeline when transporting the medium. By simulating the shaking of the pipeline on the seabed, the critical scouring pressure difference of the pipeline can be detected more accurately, providing an important parameter basis for the design and construction of submarine pipelines and helping to ensure the safe operation of the pipeline.

[0020] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A critical pressure difference experimental device for suspended pipeline scouring on a muddy seabed, comprising a reinforced support ring (1), characterized in that: The reinforcing support ring (1) is provided with a support detection experimental component; The support detection experimental assembly comprises a simulated water tank (23) arranged outside a reinforced support ring (1); a plurality of limit support rods (2) for lifting are fixedly arranged on the inner wall of the reinforced support ring (1); and each of the limit support rods (2) is rotatably connected to a first reinforced connection ring body (3) for lifting; a second reinforced connection ring body (4) for lifting is rotatably connected to the middle of the first reinforced connection ring body (3); a reinforced docking guide head (5) for docking with a pipeline is rotatably connected to the middle of the second reinforced connection ring body (4); and a reinforced frame body (6) for supporting is fixedly arranged on the inner wall of the reinforced docking guide head (5); A support seat (13) is mounted on the outer side of the simulated water tank (23) via bolts, a displacement sensor (19) for deflection detection is arranged on the support seat (13), and a plurality of signal lights (22) are arranged on the displacement sensor (19).

2. The critical pressure difference experimental device for pipeline scouring suspended on a muddy seabed according to claim 1 is characterized in that: A plurality of flow divider plates (7) for support are mounted on one side of the reinforcement frame (6) by means of bolts, and a support pad (8) is fixedly provided on each of the flow divider plates (7).

3. The critical pressure difference experimental device for pipeline scouring suspended on a muddy seabed according to claim 2 is characterized in that: A guide plate (9) is fixedly arranged on each of the plurality of support pads (8); the guide plate (9) is arranged to be triangular in shape, and a guide cavity for guiding flow is formed between each two adjacent guide plates (9).

4. The critical pressure difference experimental device for pipeline scouring suspended on a muddy seabed according to claim 3 is characterized in that: A triangular air guide cover (11) is clamped on the outer side of the air guide plate (9), and a limiting cross bar (10) is fixedly provided on one end of the support pad (8).

5. The critical pressure difference experimental device for pipeline scouring suspended on a muddy seabed according to claim 4 is characterized in that: The limiting cross bar (10) passes through the triangular air deflector (11) and extends to the outside of the triangular air deflector (11); the triangular air deflector (11) is in a triangular shape; and the triangular air deflector (11) is snap-connected to the deflector plate (9).

6. The critical pressure difference experimental device for pipeline scouring suspended on a muddy seabed according to claim 1 is characterized by: A gathering head (12) is fixedly provided at one end of the reinforced docking guide head (5), and the gathering head (12) extends to the outside of the diverter plate body (7) and is clamped with the diverter plate body (7).

7. The critical pressure difference experimental device for pipeline scouring suspended on a muddy seabed according to claim 1 is characterized by: A reinforcing tube (18) is fixedly provided at one end of the displacement sensor (19); the outer side of the reinforcing tube (18) is rotatably connected to a limit frame (14); the limit frame (14) is located on the support seat (13) and is detachably connected to the support seat (13) via bolts.

8. The suspended critical pressure difference experimental device for pipeline scouring on a muddy seabed according to claim 7 is characterized by: A clamping plate (15) is fixedly provided at one end of the limit frame (14), a limit sleeve (16) is clamped inside the clamping plate (15), and the reinforcing tube (18) is located in the middle of the limit sleeve (16).

9. The suspended critical pressure difference experimental device for pipeline scouring on a muddy seabed according to claim 8 is characterized by: The middle part of the limiting sleeve (16) is rotatably connected to a docking shaft (20), one end of the docking shaft (20) is fixedly provided with a limiting clamping plate (17), and one end of the docking shaft (20) extends to the reinforcing tube (18) and is clamped to the reinforcing tube (18).

10. The suspended critical pressure difference experimental device for pipeline scouring on a muddy seabed according to claim 9, characterized in that: The limit clamping plate (17) extends to the reinforcing support ring (1) and is clamped to the reinforcing support ring (1). The reinforcing support ring (1) is provided with a plurality of diversion holes (21).

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