Protective device for preventing sand slope migration of submarine pipeline

Abstract

The invention provides a protection device for preventing sand slope migration of a submarine pipeline, which comprises an angle plate arranged on the submarine pipeline, and the angle plate is parallel to the submarine pipeline and is positioned above the submarine pipeline; the hammock is arranged on the submarine pipeline in a spanning manner, is in sliding fit with the angle plate and can move in the axial direction of the angle plate / submarine pipeline; the monitoring unit is arranged between the angle plate and the submarine pipeline and used for monitoring whether the submarine pipeline is suspended or not in real time; the collecting units are arranged on the two sides of the hammock and used for collecting quicksand on the periphery of the submarine pipeline; and the landfill units are arranged on the two sides of the hammock and used for landfill the collected quicksand to the bottom of the submarine pipeline to form a sand slope. The device can automatically monitor whether the sand slope of the submarine pipeline is lost or not and can automatically collect and fill drift sand after the sand slope is lost so as to form a new sand slope at the bottom of the submarine pipeline, the safety and stability of the submarine pipeline can be guaranteed, and the operation and maintenance risk and cost are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submarine pipeline protection, in particular to a protection device for preventing sand dune migration of submarine pipelines. BACKGROUND

[0002] The submarine topography is complex and diverse, including deep-sea plains, trenches, seamounts and coral reefs, etc. The sand dunes are mainly distributed on the continental shelf edge or shallow sea area. Due to the demand for oil and gas resource development, submarine pipelines often need to pass through sand dune areas, but the existence of sand dunes will bring significant risks, such as pipeline suspension, deformation or burial caused by sand dune migration. Suspended pipelines are prone to bending deformation or even fatigue rupture under the action of gravity, water flow and wave force, causing oil and gas leakage; and sand dune migration may also cause the pipeline to bear uneven lateral force, leading to displacement or instability. In addition, sand dune collapse or accumulation may bury the pipeline, increase external load and hinder detection and maintenance.

[0003] At present, the existing technology lacks a special device for repairing sand dunes of submarine pipelines, and it is difficult to effectively solve the problems of pipeline suspension, lateral instability and burial, etc. in a timely manner, resulting in high pipeline operation risk and high maintenance cost. Therefore, it is urgent to develop a device that can adapt to complex submarine environments and stabilize the repair of sand dunes to affect the pipeline, so as to ensure the safety and long-term stability of the pipeline. SUMMARY

[0004] The embodiments of the present application at least provide a protection device for preventing sand dune migration of submarine pipelines, which integrates monitoring, collecting and filling functions, can automatically monitor whether the sand dune of the submarine pipeline is lost, and can automatically collect and fill the flowing sand to form a new sand dune at the bottom of the submarine pipeline after the sand dune is lost, which helps to ensure the safety and stability of the submarine pipeline and reduce the operation and maintenance risk and cost.

[0005] The embodiments of the present application provide a protection device for preventing sand dune migration of submarine pipelines, comprising: An angle plate is arranged on the submarine pipeline, and the angle plate is parallel to the submarine pipeline and located above the submarine pipeline; A hammock is arranged on the submarine pipeline and is in sliding cooperation with the angle plate, and the hammock can move along the axial direction of the angle plate / the submarine pipeline; A monitoring unit is arranged between the angle plate and the submarine pipeline, and the monitoring unit is used for monitoring whether the submarine pipeline is suspended in real time; A collecting unit is arranged on both sides of the hammock, and the collecting unit is used for collecting the flowing sand around the submarine pipeline; A filling unit is arranged on both sides of the hammock, and the filling unit is used for filling the collected flowing sand to the bottom of the submarine pipeline to form a sand dune.

[0006] In an alternative embodiment, the monitoring unit comprises a cylinder sleeve, a ring pipe, a T-shaped column and a sensing assembly; The cylinder sleeve is arranged on the side of the angle plate facing the submarine pipeline; The ring pipe is sleeved on the submarine pipeline, and the axis of the ring pipe coincides with the axis of the submarine pipeline; The T-shaped column is arranged on the ring pipe and sleeved in the cylinder sleeve, and the T-shaped column can descend with the ring pipe when the ring pipe loses the sand slope bearing capacity; The sensing assembly is arranged between the T-shaped column and the cylinder sleeve, and the sensing assembly can detect the descending distance of the T-shaped column to determine whether the submarine pipeline is suspended.

[0007] In an alternative embodiment, the sensing assembly comprises a trigger ring and a sensing ring; The trigger ring is arranged on the inner wall of the cylinder sleeve; The sensing ring is arranged on the outer wall of the end of the T-shaped column close to the angle plate, and the sensing ring can contact the trigger ring to achieve sensing when the T-shaped column descends, so that the controller controls the collection unit and the filling unit to work.

[0008] In an alternative embodiment, the collection unit comprises a sliding table, a hydraulic rod, a shovel and a filtering device; The sliding table is arranged at both ends of the bottom surface of the hammock, and the sliding table can move in the direction of approaching or moving away from the submarine pipeline relative to the hammock; The hydraulic rod is connected between the sliding table and the hammock, and the hydraulic rod is used to drive the sliding table to move in the direction of approaching or moving away from the submarine pipeline; The shovel is arranged on the bottom surface of the sliding table, and the side of the shovel facing the submarine pipeline is provided with a cavity, and the side of the shovel is provided with a sand inlet communicating with the cavity; The filtering device is arranged on the shovel, and the filtering device is provided with a sand outlet communicating with the sand inlet, and the filtering device is arranged to separate the flowing sand in the seawater and send the separated flowing sand into the cavity.

[0009] In an alternative embodiment, the filtering device comprises a filter cartridge, an electric valve, an angle valve, a water valve, a filter plate, a pad, an electric telescopic rod and a rotating device; The filter cartridge is provided with the sand outlet at one end facing the shovel, and the filter cartridge is provided with a water inlet and a water outlet in sequence in the direction away from the sand outlet on the side of the filter cartridge; The electric valve is arranged between the sand outlet and the sand inlet, and the electric valve is used to open and close to make the sand outlet and the sand inlet on and off; The angle valve is arranged at the water inlet, and is used for discharging the seawater and sand mixture into the filter cylinder; The water valve is arranged at the water outlet, and is used for discharging the seawater in the filter cylinder; The filter plate is movably arranged in the filter cylinder, and is used for filtering out the sand in the mixture; The pad plate is rotatably arranged at the side of the filter plate, and can close or open the filter hole of the filter plate by rotating circumferentially relative to the filter plate; The electric telescopic rod is arranged outside the filter cylinder, one end of the electric telescopic rod penetrates through the filter cylinder and is connected with the pad plate, and the electric telescopic rod is used for driving the filter plate to move to send the filtered sand out through the sand outlet when the pad plate closes the filter hole of the filter plate; The rotating device is arranged outside the filter cylinder and is connected with the electric telescopic rod, and the rotating device is used for driving the electric telescopic rod and the pad plate to rotate circumferentially to close or open the filter hole of the filter plate.

[0010] In an alternative embodiment, the shovel can move relative to the sliding table in a direction approaching or away from the submarine pipeline; The collecting unit further comprises a side plate and a spring rod; The side plate is arranged at the side of the shovel away from the submarine pipeline; The spring rod is connected between the side plate and the sliding table, and the spring rod is arranged to limit the relative movement of the shovel and the sliding table when no external force is applied.

[0011] In an alternative embodiment, the filling unit comprises a shovel plate and a telescopic movable column; The shovel plate is arranged in the cavity, and the shovel plate can move relative to the shovel in a direction approaching or away from the submarine pipeline to fill the sand in the cavity to the bottom of the submarine pipeline; The telescopic movable column is arranged at the side of the shovel away from the submarine pipeline and is connected with the shovel plate, and the telescopic movable column is used for driving the shovel plate to move in a direction approaching or away from the submarine pipeline.

[0012] In an alternative embodiment, the filling unit further comprises a guard plate, a cross rod, a spiral spring, an L-shaped plate, a positive plate and a negative plate; The guard plate is arranged at the telescopic movable column; The cross rod is arranged in the guard plate, and the cross rod can move relative to the guard plate in a direction approaching or away from the submarine pipeline, and one end of the cross rod close to the submarine pipeline is connected with the shovel plate; The helical spring is sleeved on the cross bar and located between the guard plate and the shovel plate, and is arranged to limit relative movement of the guard plate and the shovel plate when no external force is applied. The L-shaped plate is arranged on the side of the guard plate away from the submarine pipeline. The positive plate is arranged at the end of the cross bar away from the submarine pipeline. The negative plate is arranged on the L-shaped plate, and the negative plate triggers a reset signal when contacting the positive plate, and the reset signal is used to control the retractable movable column to retract the shovel plate.

[0013] In an optional embodiment, the protection device for preventing the sand slope of the submarine pipeline from migrating further comprises a cleaning unit arranged on the hammock, and the cleaning unit is used to blow the drifting sand on the corner plate.

[0014] In an optional embodiment, the cleaning unit comprises a water tank, an air pump, a flow emission tank and a toothed plate. The air pump is arranged on the top surface of the hammock. The water tank is arranged at both ends of the moving direction of the hammock and connected with the air outlet end of the air pump, and the water tank is used to output airflow under the pumping action of the air pump. The flow emission tank is arranged on the side of the water tank away from the hammock and connected with the air outlet end of the water tank, and the flow emission tank is used to emit airflow to the corner plate. The toothed plate is arranged on the side of the water tank away from the hammock, and the toothed plate is used to disperse the drifting sand on the corner plate when the hammock moves.

[0015] The above technical solutions of the present application have the following beneficial technical effects: The protection device for preventing the sand slope of the submarine pipeline from migrating of the present application embodiment integrates the monitoring, collecting and landfill functions, can automatically monitor whether the sand slope of the submarine pipeline is lost, and can automatically collect and landfill the drifting sand to form a new sand slope at the bottom of the submarine pipeline after the sand slope is lost, which helps to protect the safety and stability of the submarine pipeline and reduce the operation and maintenance risk and cost.

[0016] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. The drawings incorporated into the description and forming a part of the description, show the embodiments consistent with the present application, and are used to explain the technical solutions of the present application. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0018] Figure 1 A structural schematic diagram of a protection device for preventing sand slope migration of a submarine pipeline is shown in the present application. Figure 2 A schematic diagram of the protection device for preventing sand slope migration of a submarine pipeline in Figure 1 is shown from another perspective. Figure 3 An assembly schematic diagram of a hammock and an angle plate in Figure 1 is shown. Figure 4 A schematic diagram of the hammock and the angle plate in Figure 1 after separation is shown. Figure 5 An installation schematic diagram of a ring pipe in Figure 1 is shown. Figure 6 An installation schematic diagram of a sleeve and a T-shaped column in Figure 5 is shown. Figure 7 A structural schematic diagram of a filtering device in Figure 1 is shown. Figure 8 A sectional view of the filtering device in Figure 7 is shown. Figure 9 An internal schematic diagram of a shovel in Figure 1 is shown. Figure 10 A structural schematic diagram of a filling unit in Figure 9 is shown. Figure 11 A structural schematic diagram of a cleaning unit in Figure 1 is shown. A structural schematic diagram of a cleaning unit in 10, submarine pipeline; 11, flange; 100, gusset; 101, locking ring; 200, hammock; 201, mouth groove; 202, semicircular groove; 300, monitoring unit; 301, barrel sleeve; 302, ring pipe; 303, T column; 304, trigger ring; 305, induction ring; 306, reset spring; 307, bracket; 308, camera; 400, collection unit; 401, sliding table; 402, hydraulic rod; 403, shovel; 404, filtering device; 405, filter cartridge; 406, angle valve; 407, water valve; 408, filter plate; 409, backing plate; 410, electric telescopic rod; 411, building bin; 412, guide bar; 413, mouth bar; 414, cover; 415, side plate; 416, spring rod; 500, landfill unit; 501, shovel plate; 502, telescopic movable column; 503, guard plate; 504, cross rod; 505, helical spring; 506, L-shaped plate; 507, positive plate; 508, negative plate; 600, cleaning unit; 601, water tank; 602, air pump; 603, flow injection tank; 604, toothed plate; 605, table plate. DETAILED DESCRIPTION

[0019] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in the embodiments, numerical expressions, and numerical values, unless specifically stated otherwise, do not limit the scope of the present application.

[0020] Embodiments of the present application will be described in detail below with reference to drawings, examples of which are shown in the drawings, in which the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application only and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of the present application.

[0021] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0022] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] Reference Figures 1 to 11 The embodiment of the present application provides a protection device for preventing sand slope migration of a submarine pipeline, which comprises an angle plate 100, a hammock 200, a monitoring unit 300, a collecting unit 400 and a landfill unit 500. The angle plate 100 is arranged on the submarine pipeline 10, and the angle plate 100 is parallel to the submarine pipeline 10 and located above the submarine pipeline 10. The hammock 200 is arranged on the submarine pipeline 10 and is in sliding fit with the angle plate 100, and the hammock 200 can move along the axial direction of the angle plate 100 / submarine pipeline 10. The monitoring unit 300 is arranged between the angle plate 100 and the submarine pipeline 10, and the monitoring unit 300 is used for monitoring whether the submarine pipeline 10 is suspended in real time. The collecting unit 400 is arranged on both sides of the hammock 200, and the collecting unit 400 is used for collecting drifting sand around the submarine pipeline 10. The landfill unit 500 is arranged on both sides of the hammock 200, and the landfill unit 500 is used for filling the collected drifting sand to the bottom of the submarine pipeline 10 to form a sand slope. The protection device for preventing sand slope migration of the submarine pipeline integrates the functions of monitoring, collecting and landfilling, can automatically monitor whether the sand slope of the submarine pipeline 10 is lost, and can automatically collect and landfill the drifting sand to form a new sand slope at the bottom of the submarine pipeline 10 after the sand slope is lost, which helps to ensure the safety and stability of the submarine pipeline 10 and reduce the operation and maintenance risk and cost.

[0025] Reference Figure 2 and Figure 4In some embodiments, the gusset 100 is provided with locking rings 101 which are spaced along the extension direction of the gusset 100, and the gusset 100 is mounted on the flange 11 disc of the end of the submarine pipeline 10 by the locking rings 101. In the present embodiment, the locking rings 101 are arc-shaped as a whole, and are clamped on the edge of the flange 11 disc, and the outer surface of the locking rings 101 is provided with clamping grooves for clamping the gusset 100.

[0026] With reference to Figure 9 In some embodiments, the bottom surface of the hammock 200 is provided with a mouth groove 201, and the hammock 200 is slidably fitted with the gusset 100 through the mouth groove 201.

[0027] In some embodiments, the hammock 200 is in an inverted U-shaped structure. As shown in Figure 9 For example, the bottom surface of the hammock 200 is provided with a semicircular recess 202, and the mouth groove 201 is arranged in the semicircular recess 202, and the radius of the semicircular recess 202 is not less than the radius of the locking ring 101, so that the mounting seat does not interfere with the hammock 200, and the hammock 200 cannot be slid from one side to the other side of the mounting seat / flange 11.

[0028] In some embodiments, the hammock 200 can be provided with a propeller or a water jet propulsion device to achieve movement.

[0029] With reference to Figure 3 , Figure 5 and Figure 6 In some embodiments, the monitoring unit 300 includes a barrel sleeve 301, a ring pipe 302, a T-shaped column 303 and a sensing assembly. The barrel sleeve 301 is arranged on the side of the gusset 100 facing the submarine pipeline 10. The ring pipe 302 is sleeved on the submarine pipeline 10, and the axis of the ring pipe 302 coincides with the axis of the submarine pipeline 10. The T-shaped column 303 is arranged on the ring pipe 302 and is sleeved in the barrel sleeve 301, and the T-shaped column 303 can descend with the ring pipe 302 when the ring pipe 302 loses the support of the sand slope. The sensing assembly is arranged between the T-shaped column 303 and the barrel sleeve 301, and the sensing assembly can detect the descending distance of the T-shaped column 303 to determine whether the submarine pipeline 10 is suspended. In this way, the function of real-time monitoring whether the submarine pipeline 10 is suspended can be realized. Specifically, when the sand slope is washed away by seawater, the bottom of the submarine pipeline 10 lacks support, the ring pipe 302 falls under the action of its own gravity, at the same time, the T-shaped column 303 descends with the ring pipe 302, and the sensing assembly detects the descending distance of the T-shaped column 303 when the T-shaped column 303 descends, so as to determine whether the submarine pipeline 10 is suspended. Subsequently, when the sand slope is repaired, the ring pipe 302 can ascend and drive the T-shaped column 303 to return to the initial position.

[0030] With reference to Figure 5In some embodiments, the number of the barrel sleeves 301 and the T-shaped columns 303 is two, two barrel sleeves 301 are arranged at two ends of the angle plate 100 respectively, and two T-shaped columns 303 are arranged at two ends of the barrel sleeves 301 respectively. Of course, in other embodiments, the number of the barrel sleeves 301 and the T-shaped columns 303 can be more.

[0031] In some embodiments, the barrel sleeve 301 and the T-shaped column 303 are in sliding fit, and the bottom of the barrel sleeve 301 is provided with a limiting part, and the T-shaped column 303 is provided with a flange, and the flange and the limiting part can form a limit for limiting the T-shaped column 303 from disengaging from the barrel sleeve 301.

[0032] Reference Figure 6 In some embodiments, the sensing assembly includes a trigger ring 304 and a sensing ring 305. The trigger ring 304 is arranged on the inner wall (of the groove) of the barrel sleeve 301. The sensing ring 305 is arranged on the outer wall of the end of the T-shaped column 303 close to the angle plate 100, and the sensing ring 305 can contact the trigger ring 304 when the T-shaped column 303 is lowered to achieve sensing, so that the controller controls the collection unit 400 and the filling unit 500 to work. That is, the relative position between the sensing ring 305 and the trigger ring 304 can be used to determine the warning level, for example, 1, the sensing ring 305 and the trigger ring 304 are in a separated state, there is no current passing through the circuit, at this time the coil pipe 302 is lifted by the sand, and the suspension standard is not reached; 2, the sensing ring 305 and the trigger ring 304 are in a contact state, the circuit is turned on, at this time the coil pipe 302 is in a suspended state, and the electric signal generated by sensing can be transmitted to an external alarm module through a wire or a wireless way to alarm (such as sound, light, vibration, etc. Alarm mode), the water surface operator can operate the controller after receiving the alarm information to send a control signal to the collection unit 400 and the filling unit 500 to repair the sand.

[0033] Reference Figure 6 In some embodiments, the monitoring unit 300 further includes a reset spring 306, which is arranged between the T-shaped column 303 and the barrel sleeve 301, and the reset spring 306 is arranged to be able to limit the relative movement of the T-shaped column 303 and the barrel sleeve 301. Specifically, after the coil pipe 302 regains the sand load, the coil pipe 302 drives the T-shaped column 303 to gradually move upward, and the reset spring 306 can exert an upward thrust on the T-shaped column 303 by using its elasticity to limit the relative movement of the T-shaped column 303 and the barrel sleeve 301. In this embodiment, the reset spring 306 is sleeved outside the T-shaped column 303 and located between the flange of the T-shaped column 303 and the limiting part of the barrel sleeve 301. In addition, in the underwater environment, the coil pipe 302 is easy to fluctuate up and down under the action of seawater, and the reset spring 306 can limit the T-shaped column 303 to move up and down when the coil pipe 302 fluctuates, prevent the trigger ring 304 and the sensing ring 305 from being contacted in advance, and at the same time play a role in buffering energy absorption and protecting the coil pipe 302.

[0034] Referring to Figures 1 to 4 In some embodiments, the monitoring unit 300 further comprises a bracket 307 and a camera 308. The bracket 307 is arranged on the outer wall of the hammock 200. The camera 308 is arranged on the bracket 307, and the camera 308 is used to acquire seabed image information and determine whether the seabed pipeline 10 is suspended according to the acquired image information. In the present embodiment, the number of brackets 307 is two, and the two brackets 307 are symmetrically arranged on the two sides of the hammock 200 (i.e. the two sides of the hammock 200 in the direction perpendicular to the seabed pipeline 10). The number of cameras 308 is four, and two cameras 308 form a group and are symmetrically arranged at the two ends of the bracket 307 in the axial direction of the seabed pipeline 10. In a specific implementation, the image acquired by the camera 308 can also be used to determine the relative position of the hammock 200 and the angle plate 100, so as to calibrate the position between the hammock 200 and the angle plate 100. For example, when the images acquired by the cameras 308 on the two sides are symmetrical with each other, it can be determined that the hammock 200 is in a position relative to the angle plate 100, otherwise the hammock 200 needs to be moved transversely or the angle of the hammock 200 needs to be adjusted, and then the hammock 200 is mounted on the angle plate 100.

[0035] Referring to Figures 2 to 4 In some embodiments, the collecting unit 400 comprises a sliding table 401, a hydraulic rod 402, a bucket 403 and a filtering device 404. The sliding table 401 is arranged at the two ends of the bottom surface of the hammock 200 (i.e. the two sliding tables 401 are symmetrically arranged at the two ends of the bottom surface of the hammock 200), and the sliding table 401 can move relative to the hammock 200 in the direction of approaching or moving away from the seabed pipeline 10. The hydraulic rod 402 is connected between the sliding table 401 and the hammock 200 (i.e. the main body of the hydraulic rod 402 is connected to the sliding table 401, and the telescopic rod of the hydraulic rod 402 is connected to the hammock 200), and the hydraulic rod 402 is used to extend or retract to drive the sliding table 401 to move in the direction of approaching or moving away from the seabed pipeline 10. The bucket 403 is arranged on the bottom surface of the sliding table 401, and the side of the bucket 403 facing the seabed pipeline 10 is provided with a cavity. The side surface of the bucket 403 is provided with a sand inlet port in communication with the cavity. The filtering device 404 is arranged on the bucket 403, and the filtering device 404 is provided with a sand outlet port in communication with the sand inlet port. The filtering device 404 is arranged to separate the drifting sand in the seawater and send the separated drifting sand into the cavity. The working process of the collecting unit 400 is as follows: 1) after receiving the control signal of the controller, the hydraulic rod 402 is controlled to drive the sliding table 401 to move in the direction of approaching the seabed pipeline 10 until the bucket 403 abuts against the outer wall of the ring pipe 302 or the side surface of the sand slope; 2) the filtering device 404 is controlled to separate the drifting sand in the seawater, and then the separated drifting sand is sent into the cavity of the bucket 403, ready for backfilling.

[0036] In some embodiments, the sliding table 401 and the hammock 200 are slidingly fitted. For example, the bottom surface of the hammock 200 is provided with a sliding rail, and the upper surface of the sliding table 401 is provided with a sliding groove, and the sliding table 401 and the hammock 200 are slidingly fitted through the sliding groove and the sliding rail.

[0037] In some embodiments, the side of the bucket 403 facing the submarine pipeline 10 is adapted to the shape of the sand slope. For example, the side of the sand slope is arc-shaped, and the side of the bucket 403 facing the submarine pipeline 10 is also arc-shaped.

[0038] Reference is made to Figure 7 and Figure 8In some embodiments, the filtering device 404 includes a filter cylinder 405, an electric valve, an angle valve 406, a water valve 407, a filter plate 408, a pad plate 409, an electric telescopic rod 410, and a rotating device. The filter cylinder 405 is provided with a sand outlet at one end facing the bucket 403, and a water inlet and a water outlet are sequentially arranged on the side of the filter cylinder 405 away from the sand outlet. The electric valve is arranged between the sand outlet and the sand inlet, and is used to open and close the sand outlet and the sand inlet. The angle valve 406 is arranged at the water inlet, and is used to discharge the mixture of seawater and sand into the inside of the filter cylinder 405. The water valve 407 is arranged at the water outlet, and is used to discharge seawater in the inside of the filter cylinder 405. The filter plate 408 is movably arranged in the inside of the filter cylinder 405, and is used to filter out sand in the mixture. The pad plate 409 is rotatably arranged on the side of the filter plate 408, and can close or open the filter holes of the filter plate 408 by rotating circumferentially relative to the filter plate 408. The electric telescopic rod 410 is arranged outside the filter cylinder 405, one end of the electric telescopic rod 410 penetrates through the filter cylinder 405 and is connected with the pad plate 409, and the electric telescopic rod 410 is used to drive the filter plate 408 to move to send the filtered sand out through the sand outlet when the pad plate 409 closes the filter holes of the filter plate 408. The rotating device is arranged outside the filter cylinder 405 and is connected with the electric telescopic rod 410, and is used to drive the electric telescopic rod 410 and the pad plate 409 to rotate circumferentially to close or open the filter holes of the filter plate 408. The working process of the filtering device 404 is as follows: 1) control the rotating device to drive the electric telescopic rod 410 and the pad plate 409 to rotate circumferentially to make the pad plate 409 open the filter holes of the filter plate 408, and control the electric valve to close at the same time; 2) open the angle valve 406 and the water valve 407, and the mixture of seawater and sand is pumped into the inside of the filter cylinder 405 by the angle valve 406, wherein the sand is blocked by the filter plate 408, and the seawater is pumped out by the water valve 407 after passing through the filter plate 408; 3) when the sand reaches a certain amount, control the rotating device to drive the electric telescopic rod 410 and the pad plate 409 to rotate circumferentially to make the pad plate 409 close the filter holes of the filter plate 408, and control the electric valve to open at the same time; 4) control the electric telescopic rod 410 to extend, and use the filter plate 408 and the pad plate 409 to push the sand to make it enter the cavity of the bucket 403 through the electric valve, so as to realize sand collection. It should be understood that, in specific implementation, the angle valve 406 and the water valve 407 can be alternately opened and closed. Moreover, the water inlet of the angle valve 406 and the water outlet of the water valve 407 can be respectively connected with an external water pump to provide power for the inflow and outflow of seawater.

[0039] REFERENCE Figure 7 AND Figure 8In some embodiments, the electric valve comprises a housing 411, a guide 412, a mouth 413 and a cover 414. The housing 411 is arranged outside the sand outlet and connected to the filter cylinder 405 and / or the bucket 403. The housing 411 is provided with an opening on the side close to the sand outlet. The guide 412 is arranged in the housing 411 and extends along the radial direction of the sand outlet. The mouth 413 is arranged in the housing 411 and can move back and forth along the extension direction of the guide 412 under the power drive. The cover 414 is arranged on the end of the mouth 413 close to the opening. The cover 414 has a first position and a second position relative to the guide 412. In the first position, the cover 414 exits the sand outlet to make it communicate with the sand inlet. In the second position, the cover 414 enters the sand outlet to cut off the passage between the sand inlet and the sand outlet. In this way, the on-off function of the electric valve can be realized. It should be understood that in specific implementations, the mouth 413 can be arranged as an electric sliding block, or a power push rod can be arranged in the housing 411 to drive the movement of the mouth 413.

[0040] In some embodiments, the angle valve 406 can be connected to an external conveying pipe to expand the range of pumpable sand and ensure the sufficiency of sand supply.

[0041] In some embodiments, the angle valve 406 and the water valve 407 are both one-way flow valves.

[0042] In some embodiments, the rotating device can be a combination of a rotating air cylinder and a connecting rod or a gear. It should be understood that in specific implementations, the rotating device can be arranged on the outer wall of the bucket 403.

[0043] Reference Figure 1 In some embodiments, the filter device 404 is symmetrically arranged on the opposite ends of the sliding table 401 (i.e. the opposite ends of the sliding table 401 along the axial direction of the seabed pipeline 10). In this way, the collection efficiency can be improved and the structural gravity center can be stabilized.

[0044] Reference Figure 2 and Figure 4In some embodiments, the bucket 403 is movable relative to the slide base 401 in a direction approaching or moving away from the submarine pipeline 10. The collection unit 400 further comprises a side plate 415 and a spring rod 416. The side plate 415 is arranged on a side of the bucket 403 away from the submarine pipeline 10. The spring rod 416 is connected between the side plate 415 and the slide base 401, and is arranged to restrict the relative movement between the bucket 403 and the slide base 401 when no external force is applied. In this way, the bucket 403 can be kept in contact with the pipe 302 or the sand slope, ensuring the sealing between the bucket 403 and the pipe 302 or the sand slope, and improving the sand slope forming degree in the later stage. Specifically, when the bucket 403 moves in a direction approaching the submarine pipeline 10 to abut against the outer wall of the pipe 302 or the side of the sand slope, the bucket 403 has a tendency to move in a direction moving away from the submarine pipeline 10 under the action of a reverse force, i.e., the bucket 403 drives the side plate 415 to move in a direction moving away from the submarine pipeline 10, while the spring rod 416 is in a stretched state, and the force generated by the stretching of the spring rod 416 can keep the bucket 403 in contact with the pipe 302 or the sand slope, ensure the sealing between the bucket 403 and the pipe 302 or the sand slope, and indirectly improve the sand slope forming degree in the later stage. It should be understood that, in specific implementations, the bucket 403 is fixedly connected to the slide base 401, which can also avoid excessive pressure between the bucket 403 and the pipe 302 or the sand slope, affecting the structural safety.

[0045] Reference Figure 2 , Figure 3 and Figure 10 In some embodiments, the filling unit 500 comprises a shovel plate 501 and a telescopic movable column 502. The shovel plate 501 is arranged in the cavity and is movable relative to the bucket 403 in a direction approaching or moving away from the submarine pipeline 10, so as to fill the flowing sand in the cavity to the bottom of the submarine pipeline 10. The telescopic movable column 502 is arranged on a side of the bucket 403 away from the submarine pipeline 10 and is connected to the shovel plate 501, and is used to drive the shovel plate 501 to move in a direction approaching or moving away from the submarine pipeline 10. The working process of the filling unit 500 is as follows: 1) after receiving the control signal of the controller, the telescopic movable column 502 is controlled to drive the shovel plate 501 to move in a direction moving away from the submarine pipeline 10, so that the shovel plate 501 is located on the rear side of the sand inlet (i.e., the side away from the submarine pipeline 10); 2) after the filtering device 404 sends enough flowing sand into the cavity, the telescopic movable column 502 is controlled to drive the shovel plate 501 to move in a direction approaching the submarine pipeline 10, so as to push the flowing sand to the bottom of the submarine pipeline 10; 3) the above operations are repeated until the flowing sand forms a sand slope at the bottom of the submarine pipeline 10. It should be understood that, in specific implementations, the shovel plate 501 is formed in a shape consistent with the side of the sand slope.

[0046] In some embodiments, the shovel plate 501 is in clearance fit with the inner wall of the bucket 403, and the shovel plate 501 can move inside the bucket 403 to push the seawater in the bucket 403 and achieve the plugging of the bucket 403. Specifically, before the bucket 403 moves away from the submarine pipeline 10 and abuts against the outer wall of the ring pipeline 302 or the side of the sand slope, the shovel plate 501 can first move away from the submarine pipeline 10 (to the end of the bucket 403 facing the submarine pipeline 10), push the seawater in the bucket 403, and achieve temporary plugging of the bucket 403. After the bucket 403 abuts against the outer wall of the ring pipeline 302 or the side of the sand slope, the shovel plate 501 starts to perform the filling action, which can avoid the seawater remaining in the bucket 403 to limit the movement of the shovel plate 501 and affect the filling function.

[0047] In some embodiments, the telescopic movable column 502 can be an electric push rod, a hydraulic push rod, etc.

[0048] Reference Figure 10 In some embodiments, the filling unit 500 further comprises a guard plate 503, a crossbar 504, a spiral spring 505, an L-shaped plate 506, a positive plate 507, and a negative plate 508. The guard plate 503 is arranged on the telescopic movable column 502. The crossbar 504 is arranged through the guard plate 503, and the crossbar 504 can move relative to the guard plate 503 in the direction of approaching or moving away from the submarine pipeline 10. The end of the crossbar 504 close to the submarine pipeline 10 is connected with the shovel plate 501. The spiral spring 505 is sleeved on the crossbar 504 and located between the guard plate 503 and the shovel plate 501. The spiral spring 505 is arranged to limit the relative movement of the guard plate 503 and the shovel plate 501 when no external force is applied. The L-shaped plate 506 is arranged on the side of the guard plate 503 away from the submarine pipeline 10. The positive plate 507 is arranged on the end of the crossbar 504 away from the submarine pipeline 10. The negative plate 508 is arranged on the L-shaped plate 506. When the negative plate 508 contacts the positive plate 507, a reset signal is triggered, and the reset signal is used to control the telescopic movable column 502 to retract the shovel plate 501. In this way, the movement of the shovel plate 501 can be controlled. Specifically, when the telescopic movable column 502 drives the shovel plate 501 to move towards the submarine pipeline 10, the shovel plate 501 is subjected to the reaction force of the quicksand, and has a tendency to move away from the submarine pipeline 10, i.e. the shovel plate 501 compresses the spiral spring 505 and drives the crossbar 504 to move away from the submarine pipeline 10, until the positive plate 507 on the crossbar 504 contacts the negative plate 508 on the L-shaped plate 506, and then it is determined that one filling action is completed. The telescopic movable column 502 can drive the shovel plate 501 to reset and repeat the filling action. Further, when the positive plate 507 and the negative plate 508 can contact each other when the telescopic movable column 502 is not extended, it is determined that the filling is completed, and the sand slope in this section has been formed.

[0049] Reference Figure 1In some embodiments, the protection device for preventing sand dune migration of the submarine pipeline further comprises a cleaning unit 600, which is arranged on the hammock 200 and is used for blowing the drifting sand on the gusset 100. In this way, the surface of the gusset 100 can be kept clean, the drifting sand can be prevented from interfering with the movement of the hammock 200, and the stability and smoothness of the movement of the hammock 200 can be ensured.

[0050] Reference Figure 11 In some embodiments, the cleaning unit 600 comprises a water tank 601, an air pump 602, a jet tank 603, and a toothed plate 604. The air pump 602 is arranged on the top surface of the hammock 200. The water tank 601 is arranged at both ends of the moving direction of the hammock 200 (i.e., two water tanks 601 are symmetrically arranged at both ends of the moving direction of the hammock 200), the air inlet end of the water tank 601 is connected with the air outlet end of the air pump 602, and the water tank 601 is used for outputting air flow under the pumping action of the air pump 602. The jet tank 603 is arranged on the side of the water tank 601 away from the hammock 200, the air inlet end of the jet tank 603 is connected with the air outlet end of the water tank 601 through an air pipe, and the jet tank 603 is used for jetting air flow to the gusset 100. The toothed plate 604 is arranged on the side of the water tank 601 away from the hammock 200, and the toothed plate 604 is used for dispersing the drifting sand on the gusset 100 when the hammock 200 moves. The working process of the cleaning unit 600 is as follows: during the movement of the hammock 200 along the extension direction of the gusset 100, the air pump 602 is turned on, the air pump 602 provides pumping pressure to the water tank 601 located at the front end of the hammock 200, so that the water tank 601 outputs air flow, and finally the air flow is jetted to the surface of the gusset 100 through the jet tank 603, so as to promote the seawater to move along the moving direction of the hammock 200 under the blowing action, and clean the drifting sand deposited on the surface of the gusset 100. At the same time, during the movement of the hammock 200, the toothed plate 604 located at the front end of the hammock 200 can slide over the surface of the gusset 100 to disperse the accumulated drifting sand into small streams, so as to ensure the cleaning effect and avoid affecting the stability and smoothness of the movement of the hammock 200 due to incomplete cleaning. Similarly, during the movement of the hammock 200 along the extension direction of the gusset 100, the air pump 602 provides pumping pressure to the water tank 601 located at the rear end of the hammock 200.

[0051] In some embodiments, the lower end of the water tank 601 is attached to the gusset 100. In this way, the contact between the water tank 601 and the gusset 100 can be blocked, the backflow of seawater can be prevented, and the problem of re-covering of the drifting sand can be solved.

[0052] In some embodiments, the outlet of the jet tank 603 is located on the side of the jet tank 603 away from the hammock 200, and the jet angle of the outlet of the jet tank 603 and the gusset 100 have an included angle of 150°. Of course, in other embodiments, the included angle between the jet direction of the jet tank 603 and the gusset 100 can also be other angles.

[0053] Reference Figure 11 In some embodiments, the cleaning unit 600 further comprises a platform 605 arranged on the top surface of the hammock 200, the extending direction of the platform 605 is consistent with the extending direction of the corner board 100, and the water tank 601 and the air pump 602 are integrated on the platform 605. In a specific arrangement, the cleaning unit 600 can be pre-assembled first, and then installed on the hammock 200.

[0054] The protection device for preventing the sand slope of the submarine pipeline from migrating according to the embodiment of the application integrates the monitoring, collecting and landfill functions, can automatically monitor whether the sand slope of the submarine pipeline 10 is lost, and can automatically collect and landfill the flowing sand to form a new sand slope at the bottom of the submarine pipeline 10 after the sand slope is lost, which helps to ensure the safety and stability of the submarine pipeline 10 and reduce the operation and maintenance risk and cost.

[0055] One or more embodiments of the present specification are intended to cover all such alternatives, modifications and variations falling within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement and the like made in the spirit and principle of one or more embodiments of the present specification should be included in the protection scope of the present application.

[0056] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A protective device for preventing the migration of sand dunes along submarine pipelines, characterized in that, include: Angle plate, wherein the angle plate is disposed on the subsea pipeline, the angle plate is parallel to the subsea pipeline and is located above the subsea pipeline; A hammock, which is straddled on a submarine pipeline and slidably engaged with the angle plate, and the hammock is capable of moving along the axial direction of the angle plate / submarine pipeline; A monitoring unit is disposed between the corner plate and the subsea pipeline, and the monitoring unit is used to monitor in real time whether the subsea pipeline is suspended in the air. A collection unit is provided on both sides of the hammock, and the collection unit is used to collect quicksand around the submarine pipeline; A landfill unit is provided on both sides of the hammock. The landfill unit is used to fill the collected quicksand to the bottom of the submarine pipeline to form a sand slope.

2. The protective device for preventing the migration of sand dunes along submarine pipelines according to claim 1, characterized in that, The monitoring unit includes a sleeve, a coil, a T-joint column, and a sensing component; The sleeve is disposed on the side of the angle plate facing the subsea pipeline; The coiled tube is fitted onto the subsea pipeline, and the axis of the coiled tube coincides with the axis of the subsea pipeline. The T-shaped column is installed on the coiled tube and fitted in the sleeve. The T-shaped column can follow the coiled tube downward when the coiled tube loses the sand slope bearing capacity. The sensing component is disposed between the T-joint column and the sleeve, and the sensing component can detect the downward distance of the T-joint column to determine whether the subsea pipeline is suspended.

3. The protective device for preventing the migration of sand dunes along submarine pipelines according to claim 2, characterized in that, The sensing component includes a trigger ring and a sensing ring; The trigger ring is disposed on the inner wall of the sleeve; The sensing ring is disposed on the outer wall of the end of the T-joint column near the corner plate. The sensing ring can contact the trigger ring when the T-joint column moves downward to achieve sensing, so that the controller controls the acquisition unit and the landfill unit to work.

4. The protective device for preventing the migration of sand dunes along submarine pipelines according to claim 1, characterized in that, The acquisition unit includes a slide, a hydraulic rod, a bucket, and a filter device; The sliding platform is disposed at both ends of the bottom surface of the hammock, and the sliding platform can move relative to the hammock in a direction that approaches or moves away from the subsea pipeline; The hydraulic rod is connected between the slide and the hammock, and the hydraulic rod is used to drive the slide to move toward or away from the subsea pipeline; The bucket is disposed on the bottom surface of the slide platform, and a cavity is provided on the side of the bucket facing the subsea pipeline. A sand inlet connected to the cavity is provided on the side of the bucket. The filter device is installed in the bucket, and the filter device is provided with a sand outlet connected to the sand inlet. The filter device is configured to separate quicksand from seawater and send the separated quicksand into the cavity.

5. The protective device for preventing the migration of sand dunes along submarine pipelines according to claim 4, characterized in that, The filtration device includes a filter cartridge, an electric valve, an angle valve, a water valve, a filter plate, a pad, an electric telescopic rod, and a rotating device; The filter cylinder is provided with the sand outlet at one end facing the bucket, and the filter cylinder is provided with a water inlet and a water outlet in sequence along the side away from the sand outlet. The electric valve is located between the sand outlet and the sand inlet, and the electric valve is used to open and close the sand outlet and the sand inlet to switch them on and off. The angle valve is located at the water inlet and is used to discharge the mixture of seawater and quicksand into the filter cartridge. The water valve is located at the outlet and is used to discharge seawater from inside the filter cartridge. The filter plate is movably disposed inside the filter cylinder, and the filter plate is used to filter out quicksand from the mixture; The pad is rotatably disposed on the side of the filter plate, and the pad can close or open the filter holes of the filter plate by rotating circumferentially relative to the filter plate. The electric telescopic rod is installed outside the filter cylinder. One end of the electric telescopic rod passes through the filter cylinder and is connected to the pad. The electric telescopic rod is used to drive the filter plate to move when the pad closes the filter holes of the filter plate so as to send the filtered sand out through the sand outlet. The rotating device is located outside the filter cylinder and connected to the electric telescopic rod. The rotating device is used to drive the electric telescopic rod and the pad to rotate circumferentially to close or open the filter holes of the filter plate.

6. The protective device for preventing the migration of sand dunes along submarine pipelines according to claim 4, characterized in that, The bucket is capable of moving relative to the slide in a direction that approaches or moves away from the subsea pipeline; The acquisition unit also includes a side plate and a spring rod; The side plate is located on the side of the bucket away from the subsea pipeline; The spring rod is connected between the side plate and the slide, and the spring rod is configured to limit the relative movement of the bucket and the slide when no external force is applied.

7. The protective device for preventing the migration of sand dunes along submarine pipelines according to claim 4, characterized in that, The landfill unit includes a shovel and a telescopic movable column; The shovel plate is disposed in the cavity, and the shovel plate can move relative to the bucket in a direction that approaches or moves away from the subsea pipeline, so as to fill the quicksand in the cavity to the bottom of the subsea pipeline; The telescopic movable column is located on the side of the bucket away from the subsea pipeline and is connected to the shovel plate. The telescopic movable column is used to drive the shovel plate to move in a direction closer to or away from the subsea pipeline.

8. The protective device for preventing the migration of sand dunes along a submarine pipeline according to claim 7, characterized in that, The landfill unit also includes a protective plate, a crossbar, a helical spring, an L-shaped plate, a positive electrode plate, and a negative electrode plate; The protective plate is installed on the telescopic movable column; The crossbar passes through the protective plate and can move relative to the protective plate in a direction that is closer to or farther from the subsea pipeline. The end of the crossbar that is closer to the subsea pipeline is connected to the shovel plate. The helical spring is sleeved on the crossbar and located between the guard plate and the shovel plate. The helical spring is configured to limit the relative movement of the guard plate and the shovel plate when no external force is applied. The L-shaped plate is disposed on the side of the protective plate away from the subsea pipeline; The positive electrode plate is disposed at the end of the crossbar away from the subsea pipeline; The negative electrode is disposed on the L-shaped plate. When the negative electrode comes into contact with the positive electrode, a reset signal is triggered. The reset signal is used to control the telescopic movable column to retract the shovel plate.

9. The protective device for preventing the migration of sand dunes along submarine pipelines according to claim 1, characterized in that, The protective device for preventing the migration of sand dunes along the submarine pipeline also includes a cleaning unit, which is installed on the hammock and is used to blow away the quicksand that falls onto the corner plate.

10. The protective device for preventing the migration of sand dunes along a submarine pipeline according to claim 9, characterized in that, The cleaning unit includes a water tank, an air pump, a jet chamber, and a toothed plate; The air pump is installed on the top surface of the hammock; The water tanks are located at both ends of the hammock's direction of movement and connected to the air outlet of the air pump. The water tanks are used to output airflow under the pump pressure of the air pump. The jet chamber is located on the side of the water tank away from the hammock and is connected to the air outlet of the water tank. The jet chamber is used to jet airflow toward the corner plate. The toothed plate is disposed on the side of the water tank away from the hammock, and the toothed plate is used to disperse quicksand that falls on the corner plate when the hammock moves.

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