A device and method for supporting and backfilling a suspended submarine pipeline

Abstract

The present invention discloses a device and method for supporting and backfilling a suspended submarine pipeline, which belongs to the technical field of submarine facility protection. The method comprises: step one: arranging a plurality of supporting and backfilling units along the longitudinal direction of the submarine pipeline, and each supporting and backfilling unit is arranged at the suspended submarine pipeline; wherein, an annular pipeline wrapping tube is wrapped around the outer wall of the submarine pipeline, and a left support plate and a right support plate are respectively arranged at the two ends of the upper part of the lower annular wrapping part, so as to support the submarine pipeline at the suspended submarine pipeline; step two: in the process of sand flow flowing along the longitudinal direction of the submarine pipeline, the sand flow is blocked by the upper quicksand fan-shaped baffle and the lower quicksand fan-shaped baffle, and the sand flow flows along the upper quicksand fan-shaped baffle and the lower quicksand fan-shaped baffle to the left support plate and the right support plate, and finally is guided to the suspended submarine pipeline below the submarine pipeline through the sand guide hole to achieve backfilling.

Description

Technical Field

[0001] The present invention belongs to the technical field of submarine facility protection, and in particular relates to a device and method for supporting and backfilling a suspended portion of a submarine pipeline. Background Art

[0002] In recent years, ocean development has become increasingly frequent, and the construction of submarine facilities has become more diverse. This has led to new issues related to the operation of these facilities that urgently need to be addressed. During submarine facility construction, excessive seawater flow can cause scouring of the contact area between the facility and the seabed, leading to the gradual hollowing out of the seabed soil, and causing the facility to become suspended or sink. In particular, submarine cables operate in complex marine environments, where waves and currents work together to form vortices near the cables. The movement of the water entrains the mud near the bottom of the pipeline, causing it to scour the mud surface. The resulting pits and scouring make the suspended submarine cables more susceptible to fatigue damage, and the damage caused by third-party impact damage is even more severe, creating a risk factor for the normal and safe operation of submarine cables.

[0003] In short, there is currently a lack of a support and backfill device for the suspended part of the submarine pipeline to protect the submarine pipe and cable, so as to reduce the pressure of operation and maintenance and ensure the long-term safe service of the submarine equipment. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a supporting and backfilling device and method for the suspended part of a submarine pipeline, so as to solve the problem that there is currently a lack of a supporting and backfilling device for the suspended part of a submarine pipeline to protect the submarine cable.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention discloses a support and backfill device for a suspended portion of a submarine pipeline, comprising a plurality of support and backfill unit elements sequentially arranged along the longitudinal direction of the submarine pipeline, each support and backfill unit element being arranged at the suspended portion of the submarine pipeline between the submarine pipeline and the seabed;

[0007] Each supporting backfill unit includes multiple annular pipe wrapping tubes, supporting mechanisms and backfilling mechanisms.

[0008] A plurality of annular pipe wrapping tubes are wrapped around the outer wall of the submarine pipeline at intervals, and each annular pipe wrapping tube includes an upper annular wrapping portion and a lower annular wrapping portion;

[0009] The support mechanism includes a left support plate and a right support plate, and the top ends of the left support plate and the right support plate are respectively arranged on the outer walls on both sides of the lower annular wrapping portion;

[0010] The backfill mechanism includes a plurality of upper quicksand fan-shaped baffles, a plurality of lower quicksand fan-shaped baffles, and a plurality of sand guide holes. Each upper annular wrapping portion is provided with a plurality of upper quicksand fan-shaped baffles, and each lower annular wrapping portion is provided with a plurality of lower quicksand fan-shaped baffles. The plurality of sand guide holes are distributed on the plate surfaces of the left support plate and the right support plate.

[0011] The support mechanism supports the submarine pipeline at a suspended position of the submarine pipeline through a left support plate and a right support plate, wherein the plates of the left support plate and the right support plate are respectively used to be clamped on both sides of the submarine pipeline, and the bottom ends of the left support plate and the right support plate are respectively used to support the seabed;

[0012] The backfill mechanism blocks the external silt through a plurality of upper quicksand fan-shaped baffles and a plurality of lower quicksand fan-shaped baffles, and guides the silt to the suspended portion of the submarine pipeline below the submarine pipeline through a plurality of sand guide holes to achieve backfilling.

[0013] Preferably, the upper annular wrapping portion and the lower annular wrapping portion are butted together to form a complete annular shape.

[0014] Furthermore, the upper annular wrapping portion is a 1 / 3 arc end, and the lower annular wrapping portion is a 2 / 3 arc end.

[0015] Furthermore, the outer walls of the upper annular wrapping part and the lower annular wrapping part are both provided with flanges. After the upper annular wrapping part and the lower annular wrapping part are docked, the two flanges are fastened by bolts, thereby docking the upper annular wrapping part and the lower annular part together.

[0016] Preferably, the left support plate and the right support plate are symmetrical with respect to the longitudinal mid-vertical plane of the submarine pipeline.

[0017] Specifically, the left support plate and the right support plate are both three-legged support plates, including a main support plate, an outer sub-support plate and an inner sub-support plate. The top ends of the main support plates of the left support plate and the right support plate are respectively arranged on the outer walls on both sides of the upper part of the lower annular wrapping part; the outer sub-support plates and the inner sub-support plates are respectively located on both sides of the corresponding main support plates, and are parallel to the main support plates.

[0018] Furthermore, a left narrow steel strip and a right narrow steel strip are respectively provided at both ends of the upper portion of the lower annular wrapping portion, and the top ends of the main support plates of the left support plate and the right support plate are respectively fixed on the left narrow steel strip and the right narrow steel strip.

[0019] Furthermore, the left steel narrow strip is connected to the top of the main support plate of the left support plate through a row of left rotating hinges, and each row of left rotating hinges includes several rotating hinges; the right steel narrow strip is connected to the top of the main support plate of the right support plate through a row of right rotating hinges, and each row of right rotating hinges includes several rotating hinges.

[0020] Furthermore, a plurality of sand guide holes are arranged on the plate surfaces of the main support plate, outer auxiliary support plate and inner auxiliary support plate of the left support plate; a plurality of sand guide holes are arranged on the plate surfaces of the main support plate, outer auxiliary support plate and inner auxiliary support plate of the right support plate.

[0021] Preferably, the multiple upper quicksand fan-shaped baffles supporting the backfill unit are arranged on the lower annular wrapping part in parallel with each other and at the same intervals, and the multiple lower quicksand fan-shaped baffles are arranged on the lower annular wrapping part in parallel with each other and at the same intervals, and the inner arc edges of each upper quicksand fan-shaped baffle and each lower quicksand fan-shaped baffle are respectively fixed on the outer arc walls of the upper annular wrapping part and the lower annular wrapping part.

[0022] Preferably, the upper quicksand fan-shaped baffle and the lower quicksand fan-shaped baffle are both flexible thin plates.

[0023] Preferably, the angle between the plate surface of each upper quicksand sector baffle and each lower quicksand sector baffle and the longitudinal centerline of the submarine pipeline is non-right angle.

[0024] Preferably, the upper quicksand fan-shaped baffle and the corresponding lower quicksand fan-shaped baffle intersect each other in space.

[0025] In a second aspect, the present invention discloses a method for supporting and backfilling a suspended portion of a bottom pipeline, using the above-mentioned device, the method comprising the following steps:

[0026] Step 1: several supporting backfill units are respectively arranged along the longitudinal direction of the submarine pipeline, and each supporting backfill unit is arranged at a suspended position of the submarine pipeline;

[0027] The annular pipe wrapping tube is wrapped around the outer wall of the submarine pipeline, and the two ends of the upper part of the lower annular wrapping part are respectively provided with a left support plate and a right support plate to support the submarine pipeline at the suspended part of the submarine pipeline;

[0028] Step 2: As the sand flows longitudinally along the submarine pipeline, it is blocked by the upper and lower quicksand fan-shaped baffles. The sand flows along the upper and lower quicksand fan-shaped baffles to the left support plate and the right support plate, and is finally guided through the sand guide holes to the suspended part of the submarine pipeline below the submarine pipeline to achieve backfilling.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The present invention discloses a support and backfill device for a suspended submarine pipeline, comprising a plurality of support and backfill units sequentially arranged along the longitudinal direction of the submarine pipeline, each support and backfill unit being arranged at the suspended submarine pipeline between the submarine pipeline and the seabed; each support and backfill unit comprising a plurality of annular pipeline wrapping tubes, a support mechanism and a backfill mechanism, the plurality of annular pipeline wrapping tubes being wrapped around the outer wall of the submarine pipeline at intervals, each annular pipeline wrapping tube comprising an upper annular wrapping portion and a lower annular wrapping portion; the support mechanism comprising a left support plate and a right support plate, the top ends of the left support plate and the right support plate being respectively arranged on the outer walls on both sides of the lower annular wrapping portion; the backfill mechanism comprising a plurality of upper quicksand fan-shaped baffles, a plurality of lower quicksand fan-shaped baffles Baffles and multiple sand guide holes, each upper annular wrapping portion is equipped with multiple upper quicksand fan-shaped baffles, each lower annular wrapping portion is equipped with multiple lower quicksand fan-shaped baffles, and multiple sand guide holes are distributed on the plate surfaces of the left support plate and the right support plate; wherein the support mechanism supports the submarine pipeline at the suspended part of the submarine pipeline through the left support plate and the right support plate, the plate bodies of the left support plate and the right support plate are respectively used to be clamped on both sides of the submarine pipeline, and the bottom ends of the left support plate and the right support plate are respectively used to support the seabed; the backfilling mechanism blocks the external mud and sand through the multiple upper quicksand fan-shaped baffles and the multiple lower quicksand fan-shaped baffles, and these mud and sand are drained to the suspended part of the submarine pipeline below the submarine pipeline through the multiple sand guide holes to achieve backfilling. The support and backfilling device for the suspended part of the submarine pipeline disclosed in the present invention is not only conducive to supporting the suspended pipeline, but also can slow down the seabed water flow, reorganize the seabed flow state, promote the sedimentation and achieve backfilling, and has strong adaptability to the suspended submarine pipeline.

[0031] (2) The present invention discloses a method for supporting and backfilling a suspended submarine pipeline, comprising: step one: arranging a plurality of supporting backfill units along the longitudinal direction of the submarine pipeline, and each supporting backfill unit is arranged at the suspended submarine pipeline; wherein, an annular pipeline wrapping tube is wrapped around the outer wall of the submarine pipeline, and a left support plate and a right support plate are respectively arranged at the two ends of the upper part of the lower annular wrapping part, so as to support the submarine pipeline at the suspended submarine pipeline; step two: in the process of flowing longitudinally along the submarine pipeline, the sand flow is blocked by the upper quicksand fan-shaped baffle and the lower quicksand fan-shaped baffle, and the sand flow flows along the upper quicksand fan-shaped baffle and the lower quicksand fan-shaped baffle to the left support plate and the right support plate, and finally is guided to the suspended submarine pipeline below the submarine pipeline through the sand guide hole to achieve backfilling. The method for supporting and backfilling a suspended submarine pipeline disclosed in the present invention not only provides fixed support for the submarine pipeline at the suspended portion, but also realizes backfilling, thereby slowing down the flow rate of submarine water and its scouring of seabed soil, changing the flow pattern of water, promoting soil siltation, and effectively preventing water scouring and silting. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1This is a schematic diagram of the support and backfill device provided in Example 1 of the present invention applied to a suspended portion of a submarine pipeline, wherein details such as sand guide holes are not shown;

[0033] Figure 2 yes Figure 1 The cross-sectional view of the support backfill unit element obtained by cutting along the AA direction;

[0034] Figure 3 for Figure 2 Exploded diagram;

[0035] Figure 4 for Figure 3 A partial enlarged view of the lower annular wrapping portion;

[0036] Figure 5 A front view of the supporting backfill unit provided in Example 1 of the present invention;

[0037] Figure 6 for Figure 5 A partial enlarged view of the upper portion of the supporting backfill unit;

[0038] Figure 7 A top view of the supporting backfill unit provided in Example 1 of the present invention.

[0039] Explanation of reference numerals: 100 - submarine pipeline, 200 - seabed, 300 - suspended portion of submarine pipeline, 400 - support backfill unit;

[0040] 1- annular pipe wrapping cylinder; 10- flange, 11- upper annular wrapping portion; 12- lower annular wrapping cylinder;

[0041] 2-support mechanism, 21-left support plate, 210-left steel narrow strip, 211-left rotating hinge, 22-right support plate, 220-right steel narrow strip, 221-right rotating hinge, 231-main support plate; 232-outer auxiliary support plate; 233-inner auxiliary support plate;

[0042] 3- backfill mechanism, 31- upper quicksand fan-shaped baffle, 32- lower quicksand fan-shaped baffle, 33- sand guide hole. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0044] Invention Concept: To address the current lack of a support and backfill device for a suspended submarine pipeline to protect submarine cables, the present invention discloses a support and backfill device and method for a suspended submarine pipeline. A plurality of support and backfill units 400 are sequentially arranged longitudinally along a submarine pipeline 100, each of which is arranged at a suspended submarine pipeline location 300. To support the submarine pipeline 100 at the suspended submarine pipeline location 300, the support and backfill unit 400 includes a support mechanism comprising a left support plate 21 and a right support plate 22, both of which are three-legged support plates for supporting the submarine pipeline 100 at the suspended submarine pipeline location 300. Furthermore, the support and backfill unit 400 also includes a backfill mechanism comprising an upper quicksand fan-shaped baffle 31, a lower quicksand fan-shaped baffle 32, and a sand guide hole 33 for guiding external sediment to the suspended location below the submarine pipeline 100 to achieve backfilling.

[0045] Example 1: A support and backfill device for a suspended submarine pipeline

[0046] Embodiment 1 of the present invention provides a supporting and backfilling device for a suspended portion of a submarine pipeline, and its structure is described in detail below with reference to the accompanying drawings.

[0047] Reference Figure 1 The support and backfill device for the suspended part of the submarine pipeline includes a plurality of support and backfill units 400 arranged in sequence along the longitudinal direction of the submarine pipeline 100. Each support and backfill unit 400 is arranged at the suspended part 300 of the submarine pipeline between the submarine pipeline 100 and the seabed 200.

[0048] The suspended portion 300 of the submarine pipeline refers to an area where the submarine pipeline 100 cannot contact the seabed 200 , and is usually a suspended submarine pipeline with no support in the middle and unable to contact the seabed.

[0049] The supporting and backfilling device for suspended submarine pipelines disclosed in the present invention can be applied not only to long-distance suspended pipelines but also to short-distance suspended span pipelines, and only the length of the annular pipeline wrapping tube 1 needs to be increased.

[0050] refer to Figure 2 and Figure 3 The supporting backfill unit 400 includes multiple annular pipe wrapping tubes 1, a supporting mechanism 2 and a backfill mechanism 3.

[0051] Each annular pipe wrapping tube 1 includes an upper annular wrapping portion 11 and a lower annular wrapping portion 12. The upper annular wrapping portion 11 and the lower annular wrapping portion 12 are connected to form a complete annular shape. Multiple annular pipe wrapping tubes 1 are wrapped around the outer wall of the submarine pipeline 100 at intervals.

[0052] The support mechanism 2 includes a left support plate 21 and a right support plate 22. The top ends of the left support plate 21 and the right support plate 22 are respectively arranged on the outer walls on both sides of the lower annular wrapping portion 12. The plates of the left support plate 21 and the right support plate 22 are respectively used to be clamped on both sides of the submarine pipeline 100. The bottom ends of the left support plate 21 and the right support plate 22 are respectively used to support the seabed 200.

[0053] The backfill mechanism 3 includes a plurality of upper quicksand fan-shaped baffles 31, a plurality of lower quicksand fan-shaped baffles 32, and a plurality of sand guide holes 33. Each upper annular wrapping portion 11 is equipped with a plurality of upper quicksand fan-shaped baffles 31, and each lower annular wrapping portion 12 is equipped with a plurality of lower quicksand fan-shaped baffles 32. The inner arc edges of each upper quicksand fan-shaped baffle 31 and each lower quicksand fan-shaped baffle 32 are respectively fixed to the outer arc walls of the upper annular wrapping portion 11 and the lower annular wrapping portion 12; the plurality of sand guide holes 33 are distributed on the plate surfaces of the left support plate 21 and the right support plate 22.

[0054] The support mechanism supports the submarine pipeline 100 at the suspended position 300 of the submarine pipeline through the left support plate 21 and the right support plate 22;

[0055] The backfill mechanism 3 blocks the external silt through a plurality of upper quicksand fan-shaped baffles 31 and a plurality of lower quicksand fan-shaped baffles 32 , and guides the silt to the suspended portion 300 of the submarine pipeline below the submarine pipeline 100 through a plurality of sand guide holes 33 to achieve backfilling.

[0056] Specifically, the upper annular wrapping portion 11 is a 1 / 3 arc end, and the lower annular wrapping portion 12 is a 2 / 3 arc end.

[0057] More specifically, the upper annular wrapping portion 11 and the lower annular wrapping portion 12 are both made of steel. The central angle of the upper annular wrapping portion 11 is 120°, and the central angle of the lower annular wrapping portion 12 is 240°.

[0058] As a specific implementation method for achieving the docking of the upper annular wrapping part 11 and the lower annular part, the outer walls of the upper annular wrapping part 11 and the lower annular wrapping part 12 are both provided with flanges 10. After the upper annular wrapping part 11 and the lower annular wrapping part 12 are docked, the two flanges 10 are fastened by bolts, thereby docking the upper annular wrapping part 11 and the lower annular part together.

[0059] Preferably, the left support plate 21 and the right support plate 22 are symmetrical with respect to the longitudinal mid-vertical plane of the submarine pipeline 100 .

[0060] As a specific embodiment, the left support plate 21 and the right support plate 22 are both three-legged support plates, including a main support plate 231, an outer sub-support plate 232 and an inner sub-support plate 233. The top ends of the main support plates 231 of the left support plate 21 and the right support plate 22 are respectively arranged on the outer walls on both sides of the upper part of the lower annular wrapping portion 12; the outer sub-support plates 232 and the inner sub-support plates 233 are respectively located on both sides of the corresponding main support plates 231 and are parallel to the main support plates 231.

[0061] Among them, the bottom ends of the main support plates 231 of the left support plate 21 and the right support plate 22 can penetrate into the seabed mud and play a supporting role; the outer secondary support plates 232 and the inner secondary support plates 233 can also touch the seabed to further improve the stabilization effect.

[0062] More specifically, refer to Figure 4 A left steel narrow strip 210 and a right steel narrow strip 220 are respectively provided at both ends of the upper part of the lower annular wrapping part 12, and the top ends of the main support plates 231 of the left support plate 21 and the right support plate 22 are respectively fixed on the left steel narrow strip 210 and the right steel narrow strip 220.

[0063] In order to enhance the flexibility of the left support plate 21 and the right support plate 22, the left steel narrow strip 210 is connected to the top of the main support plate 231 of the left support plate 21 through a row of left rotating hinges 211, and each row of left rotating hinges 211 includes a plurality of rotating hinges. The right steel narrow strip 220 is connected to the top of the main support plate 231 of the right support plate 22 through a row of right rotating hinges 221, and each row of right rotating hinges 221 includes a plurality of rotating hinges, such as Figure 5 and Figure 6 shown.

[0064] As a specific implementation method for connecting the outer secondary support plate 232 and the inner secondary support plate 233 to the main support plate 231 , the top ends of the outer secondary support plate 232 and the inner secondary support plate 233 are fixed to the corresponding main support plate 231 through vertical elbows.

[0065] As a specific method of implementing the sand guide holes 33, multiple sand guide holes 33 are arranged on the plate surfaces of the main support plate 231, the outer auxiliary support plate 232 and the inner auxiliary support plate 233 of the left support plate 21; multiple sand guide holes 33 are arranged on the plate surfaces of the main support plate 231, the outer auxiliary support plate 232 and the inner auxiliary support plate 233 of the right support plate 22.

[0066] Since the quicksand flows along the submarine pipeline 200 , the flow rate at the upper portion of the submarine pipeline 200 is greater than that at the lower portion. Preferably, the width of the upper quicksand sector baffle 31 should be greater than the width of the corresponding lower quicksand sector baffle 32 .

[0067] In order to increase the sand-blocking effect of the upper quicksand fan-shaped baffle 31, in the same supporting backfill unit 400, multiple upper quicksand fan-shaped baffles 31 are arranged on the lower annular wrapping part 12 in parallel with each other and at the same intervals, and multiple lower quicksand fan-shaped baffles 32 are arranged on the lower annular wrapping part 12 in parallel with each other and at the same intervals, and the inner arc edges of each upper quicksand fan-shaped baffle 31 and each lower quicksand fan-shaped baffle 32 are respectively fixed on the outer arc walls of the upper annular wrapping part 11 and the lower annular wrapping part 12.

[0068] In order to receive quicksand, preferably, the upper quicksand fan-shaped baffle 31 and the lower quicksand fan-shaped baffle 32 are both flexible thin plates.

[0069] Furthermore, in order to improve the sand blocking effect, the angle between the plate surface of each upper quicksand sector baffle 31 and each lower quicksand sector baffle 32 and the longitudinal center line of the submarine pipeline 200 is non-right angle, such as Figure 7 shown.

[0070] Preferably, the upper quicksand sector baffle 31 and the corresponding lower quicksand sector baffle 32 intersect each other in space.

[0071] In order to make the upper quicksand fan-shaped baffle 31 and the corresponding lower quicksand fan-shaped baffle 32 intersect each other in space, specifically, the angle between the plate surface of the upper quicksand fan-shaped baffle 31 and the longitudinal center line of the submarine pipeline 200 is an acute angle, and the angle between the plate surface of the lower quicksand fan-shaped baffle 32 and the longitudinal center line of the submarine pipeline 200 is an obtuse angle; or the angle between the plate surface of the upper quicksand fan-shaped baffle 31 and the longitudinal center line of the submarine pipeline 200 is an obtuse angle, and the angle between the plate surface of the lower quicksand fan-shaped baffle 32 and the longitudinal center line of the submarine pipeline 200 is an acute angle.

[0072] Example 2: A method for supporting and backfilling the suspended portion of a bottom pipe

[0073] Embodiment 2 of the present invention provides a method for supporting and backfilling a suspended portion of a bottom pipe, using the apparatus of embodiment 1. The method includes the following steps:

[0074] Step 1: several supporting backfill units 400 are respectively arranged along the longitudinal direction of the submarine pipeline 100, and each supporting backfill unit 400 is arranged at the suspended portion 300 of the submarine pipeline;

[0075] The annular pipe wrapping tube 1 is wrapped around the outer wall of the submarine pipeline 100, and the left support plate 21 and the right support plate 22 are respectively arranged at the two ends of the upper part of the lower annular wrapping portion 12 to support the submarine pipeline at the suspended position 300 of the submarine pipeline.

[0076] Step 2: As the sand flows longitudinally along the submarine pipeline 100, it is blocked by the upper quicksand fan-shaped baffle 31 and the lower quicksand fan-shaped baffle 32. The sand flows along the upper quicksand fan-shaped baffle 31 and the lower quicksand fan-shaped baffle 32 to the left support plate 21 and the right support plate 22, and is finally guided through the sand guide hole 33 to the submarine pipeline suspended area 300 below the submarine pipeline 100 to achieve backfilling.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A supporting and backfilling device for a suspended submarine pipeline, characterized in that: It comprises a plurality of supporting backfill unit elements (400) arranged in sequence longitudinally along the submarine pipeline (100), each supporting backfill unit element (400) being arranged at a suspended portion (300) of the submarine pipeline between the submarine pipeline (100) and the seabed (200); Each supporting backfill unit (400) comprises a plurality of annular pipe wrapping cylinders (1), a supporting mechanism (2) and a backfill mechanism (3). A plurality of annular pipe wrapping tubes (1) are wrapped at intervals on the outer wall of a submarine pipeline (100), each annular pipe wrapping tube (1) comprising an upper annular wrapping portion (11) and a lower annular wrapping portion (12); The support mechanism (2) comprises a left support plate (21) and a right support plate (22), and the top ends of the left support plate (21) and the right support plate (22) are respectively arranged on the outer walls on both sides of the lower annular wrapping portion (12); The backfill mechanism (3) comprises a plurality of upper quicksand fan-shaped baffles (31), a plurality of lower quicksand fan-shaped baffles (32) and a plurality of sand guide holes (33), each upper annular wrapping portion (11) is provided with a plurality of upper quicksand fan-shaped baffles (31), each lower annular wrapping portion (12) is provided with a plurality of lower quicksand fan-shaped baffles (32), and the plurality of sand guide holes (33) are distributed on the plate surfaces of the left support plate (21) and the right support plate (22); The support mechanism (2) supports the submarine pipeline (100) at the suspended portion (300) of the submarine pipeline via a left support plate (21) and a right support plate (22), wherein the plates of the left support plate (21) and the right support plate (22) are respectively used to be clamped on both sides of the submarine pipeline (100), and the bottom ends of the left support plate (21) and the right support plate (22) are respectively used to support the seabed (200); The backfill mechanism (3) blocks the external sediment through a plurality of upper quicksand fan-shaped baffles (31) and a plurality of lower quicksand fan-shaped baffles (32), and guides the sediment through a plurality of sand guide holes (33) to the suspended portion (300) of the submarine pipeline below the submarine pipeline (100), thereby achieving backfilling.

2. The supporting and backfilling device for the suspended part of the submarine pipeline according to claim 1 is characterized in that: The upper annular wrapping portion (11) and the lower annular wrapping portion (12) are butted together to form a complete annular shape.

3. The supporting and backfilling device for the suspended portion of a submarine pipeline according to claim 2 is characterized in that: The upper annular wrapping portion (11) is a 1 / 3 arc end, and the lower annular wrapping portion (12) is a 2 / 3 arc end; The outer walls of the upper annular wrapping portion (11) and the lower annular wrapping portion (12) are both provided with flanges (10). After the upper annular wrapping portion (11) and the lower annular wrapping portion (12) are butted together, the two flanges (10) are fastened by bolts, thereby butting the upper annular wrapping portion (11) and the lower annular portion together.

4. The supporting and backfilling device for the suspended portion of a submarine pipeline according to claim 1 is characterized in that: The left support plate (21) and the right support plate (22) are symmetrical with respect to the longitudinal mid-vertical plane of the submarine pipeline (100).

5. The supporting and backfilling device for the suspended portion of a submarine pipeline according to claim 1 is characterized in that: The left support plate (21) and the right support plate (22) are both three-legged support plates, including a main support plate (231), an outer auxiliary support plate (232) and an inner auxiliary support plate (233). The top ends of the main support plates (231) of the left support plate (21) and the right support plate (22) are respectively arranged on the outer walls on both sides of the upper portion of the lower annular wrapping portion (12); The outer auxiliary support plate (232) and the inner auxiliary support plate (233) are respectively located on both sides of the corresponding main support plate (231) and are parallel to the main support plate (231).

6. The supporting and backfilling device for the suspended portion of a submarine pipeline according to claim 5, characterized in that: A left steel narrow strip (210) and a right steel narrow strip (220) are respectively provided at both ends of the upper portion of the lower annular wrapping portion (12); and the top ends of the main support plates (231) of the left support plate (21) and the right support plate (22) are respectively fixed on the left steel narrow strip (210) and the right steel narrow strip (220); The left steel narrow strip (210) is connected to the top of the main support plate (231) of the left support plate (21) via a row of left rotating hinges (211), and each row of left rotating hinges (211) includes a plurality of rotating hinges; the right steel narrow strip (220) is connected to the top of the main support plate (231) of the right support plate (22) via a row of right rotating hinges (221), and each row of right rotating hinges (221) includes a plurality of rotating hinges.

7. The supporting and backfilling device for the suspended portion of a submarine pipeline according to claim 5, characterized in that: A plurality of sand guide holes (33) are arranged on the plate surfaces of the main support plate (231), the outer auxiliary support plate (232), and the inner auxiliary support plate (233) of the left support plate (21); A plurality of sand guide holes (33) are arranged on the plate surfaces of the main support plate (231), the outer auxiliary support plate (232), and the inner auxiliary support plate (233) of the right support plate (22).

8. The supporting and backfilling device for the suspended portion of a submarine pipeline according to claim 1 is characterized in that: The plurality of upper quicksand fan-shaped baffles (31) of the supporting backfill unit (400) are arranged on the lower annular wrapping portion (12) in parallel with each other and at the same intervals, and the plurality of lower quicksand fan-shaped baffles (32) are arranged on the lower annular wrapping portion (12) in parallel with each other and at the same intervals, and the inner arc edges of each upper quicksand fan-shaped baffle (31) and each lower quicksand fan-shaped baffle (32) are respectively fixed on the outer arc walls of the upper annular wrapping portion (11) and the lower annular wrapping portion (12).

9. The supporting and backfilling device for the suspended portion of a submarine pipeline according to claim 8, characterized in that: The upper quicksand fan-shaped baffle (31) and the lower quicksand fan-shaped baffle (32) are both flexible thin plates; The angle between the plate surface of each upper quicksand fan-shaped baffle (31) and each lower quicksand fan-shaped baffle (32) and the longitudinal centerline of the submarine pipeline (200) is non-right angle; The upper quicksand fan-shaped baffle (31) and the corresponding lower quicksand fan-shaped baffle (32) intersect each other in space.

10. A method for supporting and backfilling a suspended portion of a bottom pipeline, using the device according to any one of claims 1 to 9, the method comprising the following steps: Step 1: a plurality of supporting backfill unit elements (400) are respectively arranged along the longitudinal direction of the submarine pipeline (100), and each supporting backfill unit element (400) is arranged at a suspended portion (300) of the submarine pipeline; The annular pipe wrapping tube (1) is wrapped around the outer wall of the submarine pipe (100), and the upper ends of the lower annular wrapping portion (12) are respectively provided with a left support plate (21) and a right support plate (22) to support the submarine pipe at the suspended portion (300) of the submarine pipe. Step 2: During the longitudinal flow of the sand along the submarine pipeline (100), the sand flow is blocked by the upper sand fan-shaped baffle (31) and the lower sand fan-shaped baffle (32). The sand flow flows along the upper sand fan-shaped baffle (31) and the lower sand fan-shaped baffle (32) to the left support plate (21) and the right support plate (22), and finally is guided to the submarine pipeline suspended portion (300) below the submarine pipeline (100) through the sand guide hole (33) to achieve backfilling.

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