System capable of promoting inward scouring and backfilling of two sides of submarine pipe ditch

Abstract

The invention relates to a system capable of promoting inward scouring and backfilling of two sides of a submarine pipe ditch, which comprises the submarine pipe ditch, a sand gathering and scouring mechanism and a sand guiding and backfilling mechanism, and a submarine pipeline is arranged in the submarine pipe ditch; the sand gathering and flushing mechanism comprises a right blocking and flushing column and a left blocking and flushing column which are arranged on the seabed on the two sides of the submarine pipe ditch respectively, and the right blocking and flushing column is used for blocking and collecting sand on the seabed on the right side of the submarine pipe ditch and enabling the sand on the seabed on the right side to flow and flush into the submarine pipe ditch; the left blocking scouring column is used for blocking and collecting sand on a seabed on the left side of the submarine pipe ditch and enabling the sand on the seabed on the left side to flow and rush into the submarine pipe ditch; the sand guiding and backfilling mechanism comprises a right blocking backfilling column and a left blocking backfilling column which are arranged on the two sides of the submarine pipeline in the submarine pipe ditch respectively, and the right blocking backfilling column is used for receiving quicksand flowing down from the seabed on the right side and enabling the quicksand to cover the submarine pipeline; the left blocking backfilling column is used for bearing quicksand flowing down from the seabed on the left side and enabling the quicksand to cover the submarine pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of submarine facility protection, and in particular relates to a system capable of promoting inward flushing and backfilling of both sides of a submarine trench. Background Art

[0002] In recent years, ocean development has become more and more frequent, and the construction of submarine facilities has become more diverse. As a result, problems related to the operation of facilities have arisen, which urgently need to be solved.

[0003] In the construction of submarine facilities, it is first necessary to excavate a submarine trench to bury the pipes, and then backfill the submarine trench.

[0004] However, during the current backfilling process of the submarine trench, it is difficult to completely bury the submarine pipeline or achieve the expected ideal soil cover thickness due to the influence of natural submarine water flow movement, and it is impossible to ensure that there is a certain soil cover thickness above the pipeline. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a system that can promote inward scouring and backfilling on both sides of the submarine trench, so as to solve the problem that during the current backfilling process of the submarine trench, it is difficult to completely bury the submarine pipeline or reach the expected ideal soil cover thickness due to the influence of natural submarine water flow movement, and it is impossible to ensure that there is a certain soil cover thickness above the pipeline.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The invention discloses a system capable of promoting inward scouring and backfilling of both sides of a submarine trench, comprising a submarine trench, a sand collecting and scouring mechanism and a sand guiding and backfilling mechanism. A submarine pipeline is installed in the submarine trench; The sand gathering and flushing mechanism comprises a right baffle flushing column and a left baffle flushing column, wherein the right baffle flushing column and the left baffle flushing column are respectively arranged on the seabed on both sides of the submarine trench, wherein the right baffle flushing column is formed by a plurality of right baffle flushing assemblies arranged in a row along the seabed on the right side of the submarine trench, and is used to block and collect sand on the seabed on the right side of the submarine trench, and the right baffle flushing assembly comprises a baffle, and at least one right sand flow collecting device is arranged on the baffle, and the right sand flow collecting device is used to make the sand on the right side of the seabed flow to form quicksand, and flush it into the submarine trench; the left baffle flushing column is formed by a plurality of left baffle flushing assemblies arranged in a row along the seabed on the left side of the submarine trench, and is used to block and collect sand on the seabed on the left side of the submarine trench, and the left baffle flushing assembly comprises a baffle, and at least one left sand flow collecting device is arranged on the baffle, and the left sand flow collecting device is used to make the sand on the left side of the seabed flow to form quicksand, and flush it into the submarine trench; The sand-guiding backfilling mechanism comprises a right backfilling column and a left backfilling column, both of which are located in the submarine trench and are respectively arranged on both sides of the submarine pipeline along the length direction of the submarine pipeline, wherein the right backfilling column is composed of a plurality of right flexible sand-guiding upright plates arranged in a row at intervals along the right side of the submarine pipeline, and is used to receive the quicksand flowing down from the right seabed, and to cover the quicksand on the right seabed on the submarine pipeline; the left backfilling column is composed of a plurality of left flexible sand-guiding upright plates arranged in a row at intervals along the left side of the submarine pipeline, and is used to receive the quicksand flowing down from the left seabed, and to cover the quicksand on the left seabed on the submarine pipeline.

[0007] Preferably, the lower part of the baffle is vertically inserted into the seabed of the submarine trench, wherein the lower part of the baffle of the right baffle flushing assembly is buried in the seabed on the right side of the submarine trench, and the lower part of the baffle of the left baffle flushing assembly is buried in the seabed on the left side of the submarine trench.

[0008] Preferably, each right sand flow collection device and each left sand flow collection device include a guide pipe and a square funnel, the guide pipe is slidably arranged on the baffle, and the outer end of the guide pipe is connected to the square funnel; the opening of the square funnel faces outward, wherein the square funnel of the right baffle scouring assembly faces rightward, and is used to receive the sand collected on the seabed on the right side of the submarine trench, and the square funnel of the left baffle scouring assembly faces leftward, and is used to receive the sand collected on the seabed on the left side of the submarine trench; wherein the baffles of the right baffle scouring assembly and the left baffle scouring assembly are respectively used to block the sand on the right and left seabeds of the submarine trench, and the more the sand is blocked, the more sand is washed away. Gradually gather; when the sand bodies on the right side gather on the seabed on the right side of the submarine trench, once these sand bodies are higher than the square funnel of the right baffle scouring assembly, the sand bodies higher than the opening of the square funnel will enter the diversion pipe through the square funnel of the right baffle scouring assembly, and flow out from the diversion pipe of the right baffle scouring assembly to form quicksand, which is washed into the submarine trench; similarly, when the sand bodies on the left side gather on the seabed on the left side of the submarine trench, once these sand bodies are higher than the square funnel of the left baffle scouring assembly, the sand bodies higher than the opening of the square funnel will enter the diversion pipe through the square funnel of the left baffle scouring assembly, and flow out from the diversion pipe of the left baffle scouring assembly to form quicksand, which is washed into the submarine trench; As the height of the square funnel decreases, the guide pipe connected to the square funnel can slide from top to bottom on the baffle, thereby driving the corresponding square funnel to move downward to ensure that the square funnel of the right baffle scouring assembly or the left baffle scouring assembly is lower than the sand collected around it.

[0009] Furthermore, each right sand flow collection device and each left sand flow collection device are configured with a sliding mechanism, each sliding mechanism includes a slide, a pulley and a connecting piece, a slide is provided in the middle and upper part of the baffle, a pulley is provided in the slide, and the guide pipes of the right baffle flushing assembly and the left baffle flushing assembly are respectively connected to the pulleys of the corresponding sliding mechanisms through corresponding connecting pieces, thereby realizing that the guide pipe is slidably set on the baffle, and the guide pipe can slide from top to bottom along the slide of the baffle.

[0010] Preferably, more than two slides are provided in the middle and upper part of the baffle, and a pulley is configured in each slide; a water-permeable gauze is provided between the top edge of each slide and each pulley, and the top and bottom sides of the water-permeable gauze are attached by Velcro; when the guide tube slides on the baffle, the pulley drives the water-permeable gauze to unfold, so that a water-permeable and sand-impermeable net is formed in the middle and upper part of the slide.

[0011] Furthermore, the inner end port of the guide tube is provided with a one-way valve, which can only allow the sand in the guide tube to flow out from the inner end of the guide tube, but prohibit the sand around the outer end port of the guide tube from entering the guide tube.

[0012] Furthermore, the one-way valve includes a hinge and a movable door plate, and the movable door plate is arranged at the inner end port of the corresponding guide tube through the hinge; when the sand in the guide tube flows out through the inner end of the guide tube, the quicksand impacts the movable door plate outward, the movable door plate expands outward, and the one-way valve is in a conducting state; when the sand around the outer side of the inner end port of the guide tube enters the guide tube, the quicksand impacts the movable door plate inward, the movable door plate retracts inward, and the one-way valve is in a closed state.

[0013] Furthermore, the right flexible sand guide plate and the left flexible sand guide plate each include a top baffle, a flexible sand guide plate and a bottom baffle, the top baffle and the bottom baffle are both flexible baffles, which are respectively arranged at the top and bottom ends of the flexible sand guide plate; wherein the flexible sand guide plate is closely arranged with several layers of movable sheet rows from top to bottom, and each layer of movable sheet rows is closely arranged with several movable sheet units, each movable sheet unit includes an movable sheet, and the movable sheet can be opened to the side close to the submarine pipeline; the bottom end of the movable sheet of the upper movable sheet unit is placed on The top end of the corresponding lower movable sheet unit, and the bottom end of the movable sheet of the upper movable sheet unit are located on the side of the lower movable sheet unit close to the submarine pipeline; when one of the right flexible sand-guiding uprights of the right backfill column receives the quicksand flowing down from the right seabed, or when one of the left flexible sand-guiding uprights of the left backfill column receives the quicksand flowing down from the left seabed, the quicksand is loaded on the movable sheet of the corresponding movable sheet unit, and at the same time forces the movable sheet to open to the side close to the submarine pipeline, and the quicksand slides along the movable sheet until it covers the submarine pipeline. Furthermore, the flexible sand guide plate includes a rubber frame, in which a plurality of steel wires are distributed laterally from top to bottom; the movable sheet unit includes a movable sheet and a tube unit, and the top edge of the movable sheet is fixedly connected to the outer wall of the tube unit along the length direction of the tube unit; a tube unit with a plurality of movable sheet units is passed through each steel wire and adjacent movable sheet units are closely arranged to form a layer of movable sheet rows; the spacing between adjacent steel wires just accommodates a row of movable sheet units, thereby forming the flexible sand guide plate with a plurality of layers of movable sheet rows closely arranged from top to bottom.

[0014] Preferably, the movable sheet is densely covered with quicksand holes.

[0015] Preferably, the bottoms of the bottom baffles of the right flexible sand guide upright and the left flexible sand guide upright are both provided with load-bearing steel plates, and the bottom surfaces of the load-bearing steel plates are provided with fixing piles.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a system capable of promoting inward scouring and backfilling on both sides of a submarine trench, comprising a submarine trench, a sand-gathering scouring mechanism and a sand-guiding backfilling mechanism. A submarine pipeline is installed in the submarine trench. The sand-gathering scouring mechanism comprises a right-blocking scouring column and a left-blocking scouring column, which are respectively arranged on the seabeds on both sides of the submarine trench, wherein the right-blocking scouring column is formed by a plurality of right-baffle scouring assemblies arranged in a row along the seabed on the right side of the submarine trench, and is used to block and collect sand on the seabed on the right side of the submarine trench. The right-baffle scouring assembly comprises a baffle, and at least one right sand flow collecting device is arranged on the baffle, and the right sand flow collecting device is used to make the sand on the right side of the seabed flow to form quicksand and scour it into the submarine trench; the left-blocking scouring column is formed by a plurality of left-baffle scouring assemblies arranged in a row along the seabed on the left side of the submarine trench, and is used to block and collect sand on the seabed on the right side of the submarine trench. The invention blocks and collects the sand on the seabed on the left side of the submarine trench. The left baffle scouring assembly includes a baffle, on which is arranged at least one left sand flow collecting device, which is used to make the sand on the left seabed flow to form quicksand and flush it into the submarine trench; the sand guiding backfilling mechanism includes a right baffle backfilling column and a left baffle backfilling column, which are respectively arranged on both sides of the submarine pipeline in the submarine trench, wherein the right baffle backfilling column is composed of a plurality of right flexible sand guiding upright plates arranged in a row along the right side of the submarine pipeline, and is used to receive the quicksand flowing down from the right seabed, and to cover the quicksand on the right seabed on the submarine pipeline; the left baffle backfilling column is composed of a plurality of left flexible sand guiding upright plates arranged in a row along the left side of the submarine pipeline, and is used to receive the quicksand flowing down from the left seabed, and to cover the quicksand on the left seabed on the submarine pipeline. The present invention discloses a system capable of promoting inward scouring and backfilling on both sides of a submarine trench, which is beneficial to increasing the seabed scouring flow rate, promoting sediment initiation, slowing down the flow rate in the reverse direction, promoting sediment deposition, having a large backfilling effect on the submarine pipeline trench, and having strong environmental adaptability, and solving the problem that, during the current submarine trench backfilling process, it is difficult to completely bury the submarine pipeline or reach the expected ideal soil cover thickness due to the influence of natural submarine water flow movement, and it is impossible to ensure that there is a certain soil cover thickness above the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall cross-sectional schematic diagram of the system capable of promoting inward scouring and backfilling of both sides of a submarine trench provided in Example 1 of the present invention; Figure 2 for Figure 1 A partial enlarged view of the right baffle flushing assembly in FIG. 1 , wherein the view is also a side view of the right baffle flushing assembly in an initial state; Figure 3 A side view of the right baffle flushing assembly provided in Example 1 of the present invention in service; Figure 4 A schematic diagram of the structure of a sliding mechanism provided in Example 1 of the present invention; Figure 5A front view of the right baffle flushing assembly provided in Example 1 of the present invention in service; Figure 6 A schematic diagram of the structure of a one-way valve provided in Example 1 of the present invention; Figure 7 for Figure 1 A partial enlarged view of the backfill device in the submarine trench; Figure 8 for Figure 7 A further enlarged view of the backfill device in FIG. Fig. 9 A front view of the right flexible sand guide plate or the left flexible sand guide plate provided in Example 1 of the present invention; Fig.10 A front view of the flexible sand guide plate provided in Example 1 of the present invention; Fig.11 A three-dimensional view of the movable sheet unit provided in Example 1 of the present invention.

[0018] Description of reference numerals: 100 - submarine trench, 200 - submarine pipeline; 11-right baffle flushing assembly, 12-left baffle flushing assembly; 100- baffle, 101- flow guide tube, 102- square funnel; 13-sliding mechanism, 131-slideway, 132-pulley, 133-connecting member; 14- one-way valve, 141- hinge, 142- movable door panel; 15-permeable gauze; 21-right flexible sand guide plate, 22-left flexible sand guide plate; 201-top baffle, 202-bottom baffle, 203-load-bearing steel plate, 204-fixed pile; 23-flexible sand guide plate, 231-rubber frame, 232-steel wire; 24-movable sheet unit, 240-movable sheet, 241-tube unit. DETAILED DESCRIPTION

[0019] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the 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. On the contrary, these embodiments are provided in order 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.

[0020] In order to solve the problem that it is difficult to completely bury the submarine pipeline or reach the expected ideal soil cover thickness during the backfilling process of the submarine trench due to the influence of the natural submarine water flow movement, and it is impossible to ensure that there is a certain soil cover thickness above the pipeline, the present invention discloses a system that can promote inward scouring and backfilling on both sides of the submarine trench, including a submarine trench, a sand-gathering scouring mechanism and a sand-guiding backfilling mechanism. A submarine pipeline is installed in the submarine trench. The sand-gathering scouring mechanism includes a right baffle scouring column and a left baffle scouring column, which are respectively arranged on the seabed on both sides of the submarine trench. The sand-guiding backfilling mechanism includes a right baffle backfilling column and a left baffle backfilling column, which are respectively arranged on both sides of the submarine pipeline in the submarine trench, wherein the sand-gathering scouring mechanism can increase the flow rate of seawater flowing from the outside of the trench, promote the starting of the soil inside the trench, and prevent the sand inside the trench from flowing out; the sand-guiding backfilling mechanism can limit the quicksand to only enter the area between the left and right flexible sand-guiding vertical plates and cover the top of the submarine pipeline, but cannot flow out. The system disclosed in the present invention can promote inward scouring and backfilling on both sides of the submarine trench, which can not only completely bury the submarine pipeline and ensure that there is a certain thickness of soil cover above the pipeline, but also effectively accelerate the backfilling speed of the submarine pipeline, improve the backfilling efficiency, and greatly improve the economy of submarine trench backfilling, which is extremely important for the development of submarine trench backfilling.

[0021] Example 1: A system that can promote inward scouring and backfilling of both sides of a submarine trench Embodiment 1 of the present invention provides a system that can promote inward scouring and backfilling on both sides of a submarine trench, and its structure is described in detail below with reference to the accompanying drawings.

[0022] refer to Figure 1 The system capable of promoting inward scouring and backfilling on both sides of a submarine trench comprises a submarine trench 100, a sand collecting and scouring mechanism and a sand guiding and backfilling mechanism.

[0023] The submarine trench 100 is formed by a depression in the seabed, with raised seabeds on both sides of the submarine trench 100. A submarine pipeline 200 is installed in the submarine trench 100.

[0024] The sand collecting and flushing mechanism comprises a right baffle flushing column and a left baffle flushing column, wherein the right baffle flushing column and the left baffle flushing column are respectively arranged on the seabed on both sides of the submarine trench 100, wherein the right baffle flushing column is formed by a plurality of right baffle flushing assemblies 11 arranged in a row along the seabed on the right side of the submarine trench 100, and is used to block and collect sand on the seabed on the right side of the submarine trench 100, and the right baffle flushing assembly 11 comprises a baffle 100, and at least one right sand flow collecting device is arranged on the baffle 100, and the right sand flow collecting device is used to collect sand on the right side of the submarine trench 100. The left baffle scouring column is formed by a plurality of left baffle scouring assemblies 12 arranged in a row along the seabed on the left side of the submarine trench 100, and is used to block and collect the sand on the seabed on the left side of the submarine trench 100. The left baffle scouring assembly 12 includes a baffle 100, and at least one left sand flow collecting device is arranged on the baffle 100. The left sand flow collecting device is used to make the sand on the left seabed flow to form quicksand and flush it into the submarine trench 100. The sand-guiding backfilling mechanism includes a right backfilling column and a left backfilling column, both of which are located in the submarine trench 100 and are respectively arranged on both sides of the submarine pipeline 200 along the length direction of the submarine pipeline 200, wherein the right backfilling column is composed of a plurality of right flexible sand-guiding upright plates 21 arranged in a row along the right side of the submarine pipeline 200, and is used to receive the quicksand flowing down from the right seabed, and to cover the quicksand on the right seabed on the submarine pipeline 200; the left backfilling column is composed of a plurality of left flexible sand-guiding upright plates 22 arranged in a row along the left side of the submarine pipeline 200, and is used to receive the quicksand flowing down from the left seabed, and to cover the quicksand on the left seabed on the submarine pipeline 200.

[0025] Preferably, the right-blocking scouring column and the left-blocking scouring column are symmetrically distributed along the longitudinal center line of the submarine trench 100 ; the right-blocking backfill column and the left-blocking backfill column are symmetrically distributed along the longitudinal center line of the submarine trench 100 .

[0026] Since the sediment deposition speed in the submarine trench 100 is too slow, the burial cannot be completed at the optimal time sometimes. The right sand flow collection device or the left sand flow collection device formed by welding the square funnel 102 and the guide pipe 101 can effectively stimulate the sediment on both sides of the submarine trench to start, so that the sediment is suspended, so as to move and return to sedimentation under the action of water flow.

[0027] Specifically, refer to Figure 2 and Figure 3The lower part of the baffle 100 is vertically inserted into the seabed of the submarine trench 100, wherein the lower part of the baffle 100 of the right baffle scouring assembly 11 is buried in the seabed on the right side of the submarine trench 100, and the lower part of the baffle 100 of the left baffle scouring assembly 12 is buried in the seabed on the left side of the submarine trench 100.

[0028] As a specific implementation method, continue to refer to Figure 2 and Figure 3 Each right sand flow collection device and each left sand flow collection device comprises a guide pipe 101 and a square funnel 102, the guide pipe 101 is slidably arranged on the baffle 100, and the outer end of the guide pipe 101 is connected to the square funnel 102; The opening of the square funnel 102 faces outward, wherein the square funnel 102 of the right baffle scouring assembly 11 faces rightward, and is used to receive sand collected on the seabed on the right side of the submarine trench 100, and the square funnel 102 of the left baffle scouring assembly 12 faces leftward, and is used to receive sand collected on the seabed on the left side of the submarine trench 100; The baffles 100 of the right baffle scouring assembly 11 and the left baffle scouring assembly 12 are used to block the sand on the right and left seabeds of the submarine trench 100, respectively. The sand is blocked more and more and gradually gathered. When the sand bodies on the right side gather on the seabed on the right side of the submarine trench 100, once these sand bodies are higher than the square funnel 102 of the right baffle scouring assembly 11, the sand bodies higher than the opening of the square funnel 102 will enter the guide pipe 101 through the square funnel 102 of the right baffle scouring assembly 11, and flow out of the guide pipe 101 of the right baffle scouring assembly 11 to form quicksand, which is washed into the submarine trench 100; Similarly, when the sand on the left side gathers on the seabed on the left side of the submarine trench 100, once the sand is higher than the square funnel 102 of the left baffle scouring assembly 12, the sand higher than the opening of the square funnel 102 will enter the guide pipe 101 through the square funnel 102 of the left baffle scouring assembly 12, and flow out of the guide pipe 101 of the left baffle scouring assembly 12 to form quicksand, which is washed into the submarine trench 100.

[0029] Since the sand body that is higher than the square funnel 102 of the right baffle scouring assembly 11 or the square funnel 102 that is higher than the left baffle scouring assembly 12 flows into the square funnel 102 and flows into the submarine trench 100 through the guide pipe 101, the height of the sand body around the square funnel 102 is getting lower and lower. In order to lower the height of the right sand flow collection device and the left sand flow collection device, the guide pipe 101 slides on the baffle 100. As the height of the square funnel 102 decreases, the guide pipe 101 connected to the square funnel 102 can slide from top to bottom on the baffle 100, thereby driving the corresponding square funnel 102 to move downward, so as to ensure that the square funnel 102 of the right baffle scouring assembly 11 or the left baffle scouring assembly 12 is lower than the sand body collected around it.

[0030] As a specific implementation method for realizing that the guide pipe 101 is slidably arranged on the baffle 100, each right sand flow collection device and each left sand flow collection device are equipped with a sliding mechanism 13, each sliding mechanism includes a slideway 131, a pulley 132 and a connecting member 133, such as Figure 4 shown.

[0031] A slide 131 is provided at the middle and upper part of the baffle 100, and a pulley 132 is configured in the slide 131. The guide pipes 101 of the right baffle flushing assembly 11 and the left baffle flushing assembly 12 are respectively connected to the pulleys 132 of the corresponding sliding mechanism 13 through corresponding connecting pieces 133, thereby realizing that the guide pipe 101 is slidably set on the baffle 100, and the guide pipe 101 can slide from top to bottom along the slide 131 of the baffle 100.

[0032] Preferably, at least two slideways 131 are provided in the middle and upper part of the baffle 100, and each slideway 131 is provided with a pulley 132. Figure 5 shown.

[0033] As the guide tube 101 slides on the baffle 100, the gap between the top edge of the slide 131 and the pulley 132 becomes larger and larger. In order to prevent sand from passing through this gap, a permeable gauze 15 is arranged between the top edge of each slide 131 and each pulley 132, and the top side and the bottom side of the permeable gauze 15 are attached by Velcro.

[0034] When the guide tube 101 slides on the baffle 100, the pulley 132 drives the water-permeable gauze 15 to unfold, so that a water-permeable and sand-impermeable net is formed in the middle and upper part of the slideway 131. Figure 5 shown.

[0035] Specifically, male Velcro is provided on both sides of the upper side of the water-permeable gauze 15, and female Velcro is provided on both sides of the top edge of the slide 131. The top of the water-permeable gauze 15 is adhered to the top edge of the slide 131 by Velcro.

[0036] In order to prevent the sand around the inner end of the guide pipe 101 from entering the guide pipe 101 and causing backflow, the inner end of the guide pipe 101 is provided with a one-way valve 14, and the one-way valve 14 can only allow the sand in the guide pipe 101 to flow out from the inner end of the guide pipe 101, but prohibit the sand around the inner end of the guide pipe 101 from entering the guide pipe 101.

[0037] As a specific implementation method, refer to Figure 6 The one-way valve 14 includes a hinge 141 and a movable door plate 142 , and the movable door plate 142 is arranged at the inner end port of the corresponding guide tube 101 through the hinge 141 .

[0038] When the sand in the guide tube 101 flows out through the inner end of the guide tube 101, the quicksand impacts the movable door plate 142 outward, the movable door plate 142 expands outward, and the one-way valve 14 is in a conducting state; when the sand around the outer side of the inner end port of the guide tube 101 enters the guide tube 101, the quicksand impacts the movable door plate 142 inward, the movable door plate 142 retracts inward, and the one-way valve 14 is in a closed state.

[0039] As a specific implementation method for receiving the quicksand flowing down from the seabed on one side and making the quicksand on the seabed on the side cover the submarine pipeline 200, refer to Figure 7 , Figure 8 and Fig. 9 The right flexible sand guide plate 21 and the left flexible sand guide plate 22 both include a top baffle 201, a flexible sand guide plate 23 and a bottom baffle 202. The top baffle 201 and the bottom baffle 202 are both flexible baffles, which are respectively arranged at the top and bottom ends of the flexible sand guide plate 23.

[0040] Among them, reference Fig.10 The flexible sand guide plate 23 has several layers of movable sheet rows closely arranged from top to bottom, and each layer of movable sheet rows is closely arranged with several movable sheet units 24, each movable sheet unit 24 includes a movable sheet 240, and the movable sheet 240 can be opened to the side close to the submarine pipeline 200.

[0041] The bottom end of the movable sheet 240 of the upper movable sheet unit 24 is placed on the top of the corresponding lower movable sheet unit 24 , and the bottom end of the movable sheet 240 of the upper movable sheet unit 24 is located on the side of the lower movable sheet unit 24 close to the submarine pipeline 200 .

[0042] When one of the right flexible sand-guiding uprights 21 of the right backfill column receives the quicksand flowing down from the right seabed, or when one of the left flexible sand-guiding uprights 22 of the left backfill column receives the quicksand flowing down from the left seabed, the quicksand is loaded on the movable sheet 240 of the corresponding movable sheet unit 24, and at the same time the movable sheet is forced to open toward the side close to the submarine pipeline 200, and the quicksand slides down along the movable sheet until it covers the submarine pipeline 200. More specifically, the flexible sand guide plate 23 includes a rubber frame 231 , in which a plurality of steel wires 232 are distributed laterally from top to bottom.

[0043] refer to Fig.11 The movable sheet unit 24 includes a movable sheet 240 and a tube unit 241 , and the top edge of the movable sheet 240 is fixedly connected to the outer wall of the tube unit 241 along the length direction of the tube unit 241 .

[0044] A plurality of tube units 241 of movable sheet units 24 are passed through each steel wire 232 and adjacent movable sheet units 24 are closely arranged to form a layer of movable sheet rows; the spacing between adjacent steel wires 232 just accommodates a row of movable sheet units 24, thereby forming the flexible sand guide plate 23 with several layers of movable sheet rows closely arranged from top to bottom.

[0045] Specifically, the rubber frame 231 is in a rectangular shape.

[0046] In order to improve the efficiency of quicksand passing through the flexible sand guide plate 23 , preferably, the movable sheet 240 is a rectangular sheet, and the movable sheet 240 is densely covered with quicksand holes.

[0047] In order to ensure the bearing capacity of the right flexible sand guide plate 21 and the left flexible sand guide plate 22, the bottom of the bottom baffle 202 of the right flexible sand guide plate 21 and the left flexible sand guide plate 22 are both provided with load-bearing steel plates 203, and the bottom surface of the load-bearing steel plates 203 is provided with fixing piles 204.

[0048] Specifically, the load-bearing steel plate 203 is in a rectangular shape.

[0049] Example 2: A method for promoting inward scouring and backfilling of both sides of a submarine trench Embodiment 2 of the present invention provides a method for promoting inward scouring and backfilling of both sides of a submarine trench, using the system for promoting inward scouring and backfilling of both sides of a submarine trench of embodiment 1, the method comprises the following steps: Sand collection and scouring: the right-blocking scouring column blocks and collects the sand on the right side of the submarine trench 100, and the right sand flow collecting device causes the sand on the right side of the seabed to flow to form quicksand, which is washed into the submarine trench 100; at the same time, the left-blocking scouring column blocks and collects the sand on the left side of the submarine trench 100, and the left sand flow collecting device causes the sand on the left side of the seabed to flow to form quicksand, which is washed into the submarine trench 100; Sand-guiding backfilling: the right backfilling column receives the quicksand flowing down from the right seabed, and makes the quicksand on the right seabed cover the submarine pipeline 200; at the same time, the left backfilling column receives the quicksand flowing down from the left seabed, and makes the quicksand on the left seabed cover the submarine pipeline 200.

[0050] In the process that the baffles 100 of the right baffle scouring assembly 11 and the left baffle scouring assembly 12 respectively block the sand bodies on the right and left seabeds of the submarine trench 100, more and more sand bodies are blocked and gradually gathered; when the sand bodies on the right side are gathered on the seabed on the right side of the submarine trench 100, once these sand bodies are higher than the square funnel 102 of the right baffle scouring assembly 11, the sand bodies higher than the opening of the square funnel 102 will pass through the square funnel 102 of the right baffle scouring assembly 11 into the guide pipe 101, and from the right The guide pipe 101 of the baffle scouring assembly 11 flows out to form quicksand, which is washed into the submarine trench 100; similarly, when the sand on the left side gathers on the seabed on the left side of the submarine trench 100, once these sand bodies are higher than the square funnel 102 of the left baffle scouring assembly 12, the sand bodies higher than the opening of the square funnel 102 will enter the guide pipe 101 through the square funnel 102 of the left baffle scouring assembly 12, and flow out from the guide pipe 101 of the left baffle scouring assembly 12 to form quicksand, which is washed into the submarine trench 100.

[0051] As the height of the square funnel 102 decreases, the guide pipe 101 connected to the square funnel 102 can slide from top to bottom on the baffle 100, thereby driving the corresponding square funnel 102 to move downward to ensure that the square funnel 102 of the right baffle flushing assembly 11 or the left baffle flushing assembly 12 is lower than the sand collected around it.

[0052] When the guide tube 101 slides on the baffle 100 , the pulley 132 drives the water-permeable gauze 15 to unfold, so that a water-permeable and sand-impermeable net is formed in the middle and upper part of the baffle 100 .

[0053] 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 embodiments of the present invention.

Claims

1. A system capable of promoting inward scouring and backfilling of both sides of a submarine trench, comprising a submarine trench (100), wherein a submarine pipeline (200) is installed in the submarine trench (100), characterized in that: Also includes A sand collecting and flushing mechanism comprises a right baffle flushing column and a left baffle flushing column, the right baffle flushing column and the left baffle flushing column being respectively arranged on the seabed on both sides of a submarine trench (100), wherein the right baffle flushing column is formed by a plurality of right baffle flushing assemblies (11) arranged in a row along the seabed on the right side of the submarine trench (100) at intervals, and is used to block and collect sand on the seabed on the right side of the submarine trench (100), the right baffle flushing assembly (11) comprising a baffle (100), the baffle (100) being provided with at least one right sand flow collecting device, the right sand flow collecting device being used to collect sand on the seabed on the right side of the submarine trench (100) The sand on the right seabed is caused to flow to form quicksand, which is flushed into the submarine trench (100); the left baffle scouring column is formed by a plurality of left baffle scouring assemblies (12) arranged in a row along the seabed on the left side of the submarine trench (100) at intervals, and is used to block and collect sand on the seabed on the left side of the submarine trench (100); the left baffle scouring assembly (12) comprises a baffle (100), and at least one left sand flow collecting device is arranged on the baffle (100); the left sand flow collecting device is used to cause the sand on the left seabed to flow to form quicksand, which is flushed into the submarine trench (100); A sand-guiding backfilling mechanism comprises a right backfilling column and a left backfilling column, wherein the right backfilling column and the left backfilling column are both located in a submarine trench (100) and are respectively arranged on both sides of a submarine pipeline (200) along the length direction of the submarine pipeline (200), wherein the right backfilling column is formed by a plurality of right flexible sand-guiding upright plates (21) arranged in a row at intervals along the right side of the submarine pipeline (200), and is used to receive quicksand flowing down from the right seabed, and to cover the quicksand on the right seabed on the submarine pipeline (200); and the left backfilling column is formed by a plurality of left flexible sand-guiding upright plates (22) arranged in a row at intervals along the left side of the submarine pipeline (200), and is used to receive quicksand flowing down from the left seabed, and to cover the quicksand on the left seabed on the submarine pipeline (200).

2. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 1, characterized in that: The lower part of the baffle (100) is vertically inserted into the seabed of the submarine pipeline trench (100), wherein the lower part of the baffle (100) of the right baffle scouring assembly (11) is buried in the seabed on the right side of the submarine pipeline trench (100), and the lower part of the baffle (100) of the left baffle scouring assembly (12) is buried in the seabed on the left side of the submarine pipeline trench (100); Each right sand flow collection device and each left sand flow collection device comprises a guide pipe (101) and a square funnel (102); the guide pipe (101) is slidably arranged on the baffle (100); the outer end of the guide pipe (101) is butt-jointed with the square funnel (102); The opening of the square funnel (102) faces outward, wherein the square funnel (102) of the right baffle scouring assembly (11) faces rightward and is used to receive sand collected on the seabed on the right side of the submarine trench (100), and the square funnel (102) of the left baffle scouring assembly (12) faces leftward and is used to receive sand collected on the seabed on the left side of the submarine trench (100); The baffles (100) of the right baffle scouring assembly (11) and the left baffle scouring assembly (12) are used to block sand on the right and left seabeds of the submarine trench (100), respectively, and the sand is blocked more and more and gradually gathered; When the sand bodies on the right side gather on the seabed on the right side of the submarine trench (100), once the sand bodies are higher than the square funnel (102) of the right baffle scouring assembly (11), the sand bodies higher than the opening of the square funnel (102) will enter the guide pipe (101) through the square funnel (102) of the right baffle scouring assembly (11), and flow out of the guide pipe (101) of the right baffle scouring assembly (11) to form quicksand, which is scour into the submarine trench (100); Similarly, when the sand bodies on the left side gather on the seabed on the left side of the submarine trench (100), once the sand bodies are higher than the square funnel (102) of the left baffle scouring assembly (12), the sand bodies higher than the opening of the square funnel (102) will enter the guide pipe (101) through the square funnel (102) of the left baffle scouring assembly (12), and flow out of the guide pipe (101) of the left baffle scouring assembly (12) to form quicksand, which is washed into the submarine trench (100); As the height of the square funnel (102) decreases, the guide pipe (101) connected to the square funnel (102) can slide from top to bottom on the baffle (100), thereby driving the corresponding square funnel (102) to move downward, so as to ensure that the square funnel (102) of the right baffle flushing assembly (11) or the left baffle flushing assembly (12) is lower than the sand collected in the surrounding area.

3. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 2, characterized in that: Each right sand flow collection device and each left sand flow collection device is provided with a sliding mechanism (13), each sliding mechanism comprising a slideway (131), a pulley (132) and a connecting member (133). A slideway (131) is provided at the middle and upper part of the baffle (100), and a pulley (132) is arranged in the slideway (131). The guide pipes (101) of the right baffle flushing assembly (11) and the left baffle flushing assembly (12) are respectively connected to the pulleys (132) of the corresponding sliding mechanisms (13) through corresponding connecting pieces (133), thereby achieving that the guide pipe (101) is slidably arranged on the baffle (100), and the guide pipe (101) can slide from top to bottom along the slideway (131) of the baffle (100).

4. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 3, characterized in that: More than two slideways (131) are provided at the middle and upper part of the baffle (100), and a pulley (132) is disposed in each slideway (131); A water-permeable gauze (15) is provided between the top edge of each slideway (131) and each pulley (132), and the top side and the bottom side of the water-permeable gauze (15) are attached by Velcro; When the guide tube (101) slides on the baffle (100), the pulley (132) drives the water-permeable gauze (15) to unfold, so that a water-permeable and sand-impermeable net is formed in the middle and upper part of the slideway (131).

5. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 2, characterized in that: The inner end port of the flow guide tube (101) is provided with a one-way valve (14). The one-way valve (14) can only allow the sand in the flow guide tube (101) to flow out from the inner end of the flow guide tube (101), but prohibits the sand around the outer side of the inner end port of the flow guide tube (101) from entering the flow guide tube (101).

6. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 5, characterized in that: The one-way valve (14) comprises a hinge (141) and a movable door plate (142); the movable door plate (142) is arranged at an inner end port of a corresponding flow guide pipe (101) via the hinge (141); When the sand in the guide tube (101) flows out through the inner end of the guide tube (101), the quicksand impacts the movable door plate (142) outwardly, the movable door plate (142) expands outwardly, and the one-way valve (14) is in a conducting state; When the sand around the outer side of the inner end port of the flow guide pipe (101) enters the flow guide pipe (101), the quicksand impacts the movable door plate (142) inwardly, and the movable door plate (142) retracts inwardly, and the one-way valve (14) is in a closed state.

7. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 1, characterized in that: The right flexible sand guide upright plate (21) and the left flexible sand guide upright plate (22) both comprise a top baffle plate (201), a flexible sand guide plate (23) and a bottom baffle plate (202); the top baffle plate (201) and the bottom baffle plate (202) are both flexible baffle plates, and are respectively arranged at the top end and the bottom end of the flexible sand guide plate (23); The flexible sand guide plate (23) is closely arranged with a plurality of layers of movable sheet rows from top to bottom, each layer of movable sheet rows is closely arranged with a plurality of movable sheet units (24), each movable sheet unit (24) comprises a movable sheet (240), and the movable sheet (240) can be opened toward a side close to the submarine pipeline (200); The bottom end of the movable sheet (240) of the upper movable sheet unit (24) is placed on the top end of the corresponding lower movable sheet unit (24), and the bottom end of the movable sheet (240) of the upper movable sheet unit (24) is located on a side of the lower movable sheet unit (24) close to the submarine pipeline (200); When one of the right flexible sand-guiding uprights (21) of the right backfill column receives quicksand flowing down from the right seabed, or when one of the left flexible sand-guiding uprights (22) of the left backfill column receives quicksand flowing down from the left seabed, the quicksand is loaded onto the movable sheet (240) of the corresponding movable sheet unit (24), and the movable sheet is forced to open toward the side close to the submarine pipeline (200), and the quicksand slides down along the movable sheet until it covers the submarine pipeline (200).

8. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 7, characterized in that: The flexible sand guide plate (23) comprises a rubber frame (231), and a plurality of steel wires (232) are distributed laterally from top to bottom in the rubber frame (231); The movable sheet unit (24) comprises a movable sheet (240) and a tube unit (241), and the top edge of the movable sheet (240) is fixedly connected to the outer wall of the tube unit (241) along the length direction of the tube unit (241); A plurality of tubular body units (241) of movable sheet units (24) are passed through each steel wire (232), and adjacent movable sheet units (24) are closely arranged to form a layer of movable sheet rows; the spacing between adjacent steel wires (232) is just enough to accommodate a row of movable sheet units (24), thereby forming the flexible sand guide plate (23) having a plurality of layers of movable sheet rows closely arranged from top to bottom.

9. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 8, characterized in that: The movable sheet (240) is densely covered with quicksand holes.

10. The system for promoting inward flushing and backfilling of both sides of a submarine trench according to claim 8, characterized in that: The bottoms of the bottom baffles (202) of the right flexible sand guide plate (21) and the left flexible sand guide plate (22) are both provided with load-bearing steel plates (203), and the bottom surfaces of the load-bearing steel plates (203) are provided with fixing piles (204).

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