Pile positioning semi-submersible offshore dredging engineering apparatus

Abstract

The present application relates to offshore dredging platform technical field, specifically relates to a kind of pile positioning semi-submersible offshore dredging engineering equipment, including operation platform, lower float and dredging platform, the lower float is fixedly installed in operation platform bottom by support column, the dredging platform is fixedly installed in operation platform middle portion by support frame, and dredging head is installed on the dredging platform, for carrying out dredging work to the below of operation platform, the present application can improve the water level in anchor pile by using the cooperation of siphon water pipe and flexible bag, and utilize siphon effect, sea water in anchor pile is discharged from anchor pile by siphon water pipe, sea water in anchor pile can be quickly discharged, realize fast positioning, in the stage of lifting pile, flexible bag is contracted, utilize negative pressure to help suction sea water, accelerate the balance of sea water pressure inside and outside anchor pile, shorten lifting pile time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore dredging platform, in particular to a pile positioning semi-submersible offshore dredging engineering equipment. BACKGROUND

[0002] Offshore dredging work (i.e. using special equipment to excavate, remove and transport seabed sediments) is a vital and common marine engineering activity, which is necessary for the maintenance or expansion of the port, and the corresponding position of the seabed needs to be dredged or flattened to facilitate the berthing of ships, so the corresponding dredging platform is used for offshore dredging.

[0003] The existing Chinese patent with the application number CN201310258224.8 discloses a self-installed suction pile type movable platform structure, which comprises a ship body platform and a suction pile foundation located below the ship body platform, the suction pile foundation is connected with the ship body platform through a plurality of pile legs, a lifting mechanism and a locking mechanism are arranged between the pile legs and the ship body platform, the suction pile foundation is connected with a water surface monitoring system and an underwater power system, a platform crane is further arranged on the ship body platform, the platform crane can hoist a mud blowing device to perform mud blowing construction, and a plurality of positioning anchors are hoisted at the edge of the ship body platform.

[0004] The Chinese patent with the application number CN201410205804.5 discloses a pile positioning semi-submersible offshore dredging engineering ship, which comprises a semi-submersible platform, a dredging device, a positioning pile, a positioning pile lifting system and a ship moving system; wherein the dredging device is installed on the semi-submersible platform, the positioning pile lifting system is fixed on the semi-submersible platform, the positioning pile is arranged in the positioning pile lifting system, and the ship moving system is connected with the semi-submersible platform.

[0005] Generally speaking, the pile positioning offshore platform can be accurately positioned when carrying out dredging work, and the semi-submersible offshore platform can adjust the floating body draft by the ballast tank, utilize the buoyancy to offset the disturbance of the wave, and enhance the stability, so that the device can provide higher positioning and wave resistance performance. Generally speaking, the moving efficiency of the pile positioning semi-submersible offshore platform during dredging is related to the time required for the lifting and lowering of the positioning pile. When the pile is lifted, seawater needs to be supplemented into the pile, and when the pile is positioned, the pile body is lowered and the seawater in the pile is discharged to generate a fixing effect by negative pressure. Therefore, a lot of time is needed to discharge or suck seawater during positioning and pile lifting, which affects the dredging efficiency of the pile positioning semi-submersible offshore platform. SUMMARY

[0006] In view of the above-mentioned shortcomings of the prior art, the present application provides a pile positioning semi-submersible offshore dredging engineering equipment, which can effectively solve the problem of how to shorten the pile positioning time in the prior art.

[0007] To achieve the above object, the present application is realized by the following technical solutions:

[0008] The present application provides a pile positioning semi-submersible offshore dredging engineering equipment, which comprises a working platform, a lower floating body and a dredging platform, the lower floating body is fixedly installed at the bottom of the working platform through a support column, the dredging platform is fixedly installed at the middle of the working platform through a support frame, and a dredging suction head is installed on the dredging platform for dredging work below the working platform, and the equipment further comprises:

[0009] A positioning pile assembly is arranged at both sides of the working platform, connecting pieces are fixedly installed at both sides of the working platform and the lower floating body, and the positioning pile assembly is installed in the connecting pieces, the positioning pile assembly comprises an anchor pile slidingly inserted into the connecting piece, a sealing assembly is installed at the bottom end of the anchor pile for closing or opening the bottom end of the anchor pile, a water pumping pipe and two air pipes are penetratingly installed in the middle of the top plate of the anchor pile, the water pumping pipe is directly connected with a water pump, the water pump is used for pumping seawater in the anchor pile, a flexible bag is fixedly and inlaidly installed in the anchor pile, the flexible bag has a plurality of and is concentrically distributed upwards and downwards, the air pipes are in the flexible bag, the air pipes are connected with an air pump, the air pump is used for pumping or supplementing gas in the flexible bag, and a siphon water suction pipe is penetratingly and fixedly installed in the anchor pile for assisting in discharging seawater in the anchor pile.

[0010] Further, a gear is fixedly installed on the outside of the anchor pile, a motor is fixedly installed at the bottom of the working platform, and a rack engaged with the gear is fixedly connected to the output end of the motor.

[0011] Further, a plurality of air suction holes are formed in the air pipes, and the plurality of air suction holes correspond to the plurality of air pipes respectively.

[0012] Further, a sealing assembly is installed at the bottom end of the anchor pile for closing or opening the bottom end of the anchor pile, and the sealing assembly comprises a fixed ring slidingly installed in the anchor pile, a push plate oil cylinder is fixedly installed at the center of the fixed ring, the output end of the push plate oil cylinder faces downward, and a blocking plate is fixedly connected to the output end of the push plate oil cylinder.

[0013] Further, a support ring is fixedly connected in the anchor pile, a liquid pushing oil cylinder is fixedly connected to the bottom of the support ring, the output end of the liquid pushing oil cylinder faces downward and is fixedly connected to the top of the fixed ring, a plurality of drainage holes are formed in the bottom of the anchor pile, and the diameters of the drainage holes gradually decrease outward in the anchor pile.

[0014] Further, the siphon water suction pipe comprises a bend pipe fixedly and penetratingly installed at the circumferential side of the anchor pile, the bottom end of the bend pipe extends above the fixed ring, the water pumping pipe is a hose, and a filter screen is fixedly connected to the bottom end of the water pumping pipe.

[0015] Further, the circumference side bottom of the water pumping pipe is fixedly connected with a buoyancy ring, the buoyancy ring provides buoyancy for the bottom end of the water pumping pipe, and with the rising of seawater, the bottom end of the water pumping pipe rises along with the water surface.

[0016] Further, a plurality of partition plates are fixedly connected to the bent pipe through a pipe sleeve, and the plurality of partition plates are respectively arranged between the plurality of flexible bags.

[0017] Further, the siphon water pipe further comprises a folding pipe at one end of the bent pipe, the folding pipe is located outside the anchor pile, the bottom of the bent pipe and the bent pipe are fixedly connected with fixing frames, and the two fixing frames are fixedly connected with a push pipe cylinder.

[0018] Compared with the known prior art, the technical scheme provided by the application has the following beneficial effects:

[0019] 1. By cooperating the siphon water pipe with the flexible bag, the water level in the anchor pile can be raised, and the seawater in the anchor pile can be discharged through the siphon water pipe by the siphon effect, so that the seawater in the anchor pile can be quickly discharged to realize rapid positioning.

[0020] 2. By using the flexible bag at different stages, when the flexible bag is inflated and then shrunk during the positioning of the anchor pile, a negative pressure space is generated in the anchor pile to help seawater enter the anchor pile, during the positioning stage, the flexible bag is inflated to help raise the water level in the anchor pile by reducing the internal space of the anchor pile to help drainage, and during the pile lifting stage, the flexible bag is shrunk to help seawater be sucked in by using negative pressure, so as to accelerate the balance of seawater pressure inside and outside the anchor pile and shorten the pile lifting time. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the application;

[0023] Figure 2 It is a schematic diagram of the positioning pile assembly of the application;

[0024] Figure 3 It is a schematic diagram of the internal structure of the positioning pile assembly of the application;

[0025] Figure 4 It is a schematic diagram of the positioning pile assembly of the application; Figure 3 It is an enlarged view of A in the schematic diagram of the positioning pile assembly of the application;

[0026] Figure 5 Fig. 1 is a schematic view of the siphon water suction pipe of the present application. Figure 3 Fig. 2 is an enlarged view of B in Fig. 1.

[0027] Figure 6 Fig. 3 is a schematic view of the siphon water suction pipe of the present application.

[0028] The reference numbers in the figures represent: 1, working platform; 2, lower floating body; 3, dredging platform; 4, dredging suction head; 5, positioning pile assembly; 501, anchor pile; 502, gear; 503, rack; 504, water pumping pipe; 505, air pipe; 506, flexible bag; 507, buoyancy ring; 508, filter screen; 6, siphon water suction pipe; 601, elbow pipe; 602, folding pipe; 603, fixing frame; 604, push pipe air cylinder; 605, partition plate; 7, sealing assembly; 701, fixing ring; 702, blocking plate; 703, push plate oil cylinder; 704, supporting ring; 705, push liquid oil cylinder; 706, drainage hole. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0030] The present application will be further described below with reference to the embodiments.

[0031] Reference is made to Figures 1 to 6The embodiment is a pile positioning semi-submersible offshore dredging engineering equipment, which comprises a working platform 1, a lower floating body 2 and a dredging platform 3. The lower floating body 2 is fixedly installed at the bottom of the working platform 1 through a support column. The dredging platform 3 is fixedly installed in the middle of the working platform 1 through a support frame. The dredging platform 3 is provided with a dredging suction head 4 for dredging the area below the working platform 1. A positioning pile assembly 5 is arranged at both sides of the working platform 1. Connecting pieces are fixedly installed at both sides of the working platform 1 and the lower floating body 2. The positioning pile assembly 5 is installed in the connecting pieces. The positioning pile assembly 5 comprises an anchor pile 501 slidingly inserted into the connecting pieces. A water pumping pipe 504 and two air pipes 505 are penetratingly installed in the middle of the top plate of the anchor pile 501. The water pumping pipe 504 is directly connected with a water pump. The water pump is used to pump out seawater in the anchor pile 501. A flexible bag 506 is fixedly and inlaidly installed in the anchor pile 501. The air pipes 505 are in the flexible bag 506. The air pipes 505 are connected with an air pump. The air pump is used to pump out or supplement the gas in the flexible bag 506. A siphon water suction pipe 6 is penetratingly and fixedly installed in the anchor pile 501 and used to assist in discharging seawater in the anchor pile 501. A gear 502 is fixedly installed on the outside of the anchor pile 501. A motor is fixedly installed at the bottom of the working platform 1. The output end of the motor is fixedly connected with a rack 503 which is engaged with the gear 502.

[0032] The working platform 1 is used as an offshore platform to provide a space for personnel to work. The dredging platform 3 is connected with the dredging suction head 4. The dredging suction head 4 is used to dredge the seabed area below the working platform 1. The lower floating body 2 provides buoyancy for the working platform 1 and the equipment on the working platform 1. During dredging, the height of the working platform 1 above the water surface can be adjusted by adjusting the ballast tank. When the working platform 1 is lowered by a certain height, the overall gravity center can be lowered, and the rolling, pitching and heaving amplitudes can be reduced. After the positioning pile assembly 5 is lifted, the working platform 1 can be self-propelled or moved by a tugboat by using the buoyancy provided by the lower floating body 2.

[0033] In the preparation stage of dredging, the flexible bag 506 remains in the inflated state, the working platform 1 moves to the working area, and then the anchor pile 501 is lowered, the bottom of the anchor pile 501 sinks to the seabed, and at the same time the air pump is started to suck the gas in the flexible bag 506, increase the internal space of the anchor pile 501, form a negative pressure state, and suck seawater into the anchor pile 501 to help fill the seawater in the anchor pile 501, and then the anchor pile 501 is inserted into the silt at a depth of five to seven meters. During the process of inserting into the silt, seawater can enter the anchor pile 501, and then the seawater in the anchor pile 501 is pumped out by the water pump through the water suction pipe 504 to form a low pressure area in the anchor pile 501, and the pressure of the seawater forces the anchor pile 501 to be firmly fixed in the silt, achieving good positioning effect. Correspondingly, during the lowering process of the anchor pile 501, the ballast tank of the lower floating body 2 can be adjusted to adjust the position of the whole working platform 1, and in turn to adjust the position of the anchor pile 501, so as to adjust the positioning position of the anchor pile 501. During the process of pumping out seawater in the anchor pile 501 by the water suction pipe 504, the air pump inputs gas into the air pipe 505 to force the flexible bag 506 to expand outward and extrude the seawater in the anchor pile 501, which increases the water pressure in the anchor pile 501. At the same time, the air pressure in the flexible bag 506 should be increased before pumping water, so that the flexible bag 506 can always extrude seawater during the process of pumping out seawater. Correspondingly, when extruding seawater, the seawater level in the anchor pile 501 can be higher than that outside the anchor pile 501, and seawater can flow out of the anchor pile 501 along the siphon water suction pipe 6. When the seawater exceeds the highest point of the siphon water suction pipe 6, the seawater has extruded the air in the siphon water suction pipe 6, forming a certain closed space in the siphon water suction pipe 6. At this time, under the higher liquid level difference between the inside and outside of the anchor pile 501, the siphon water suction pipe 6 can suck out the seawater in the anchor pile 501. At this time, the water is pumped out by the water suction pipe 504 and the siphon water suction pipe 6 together, and the siphon water suction pipe 6 is extruded by the flexible bag 506 and the liquid level difference to pump out water. When the seawater level in the anchor pile 501 is level with the outside seawater level, there is no pressure difference between the inside and outside, and the seawater can continue to be discharged from the siphon water suction pipe 6 under the continuous extrusion of the flexible bag 506. In this way, after the position of the water suction pipe 504 is determined, seawater can be quickly pumped out to quickly form a low pressure area in the anchor pile 501, and the anchor pile 501 is fixed by the pressure of seawater, achieving rapid positioning.

[0034] In the dredging stage, the dredging suction head 4 discharges the sediment under the work platform 1, and the flexible bag 506 can maintain the high-pressure expansion state during this process. When the dredging stage is completed, the anchor pile 501 needs to be lifted. Due to the large pressure of seawater, if the lifting system is directly used to lift the anchor pile 501, it may cause damage to the lifting system or the anchor pile 501 cannot be lifted. Therefore, it is necessary to lift a small distance upward and stand still for a period of time to generate a gap between the anchor pile 501 and the sediment, so that seawater can enter the anchor pile 501. After the seawater pressure inside and outside the anchor pile 501 is balanced, the anchor pile 501 is pulled up. Therefore, the gas in the flexible bag 506 can be quickly pumped out at this time to make the flexible bag 506 quickly contract downward, so that the internal space of the anchor pile 501 is quickly increased, which can help quickly suck seawater outside the anchor pile 501 and quickly balance the seawater pressure inside and outside the anchor pile 501, thereby helping to shorten the lifting time of the anchor pile 501.

[0035] It should be noted that the gear 502 and the rack 503 and other components belong to the lifting system of the anchor pile 501, which is a way of lifting. A hydraulic cylinder lifting mechanism can also be used, which belongs to the prior art. No further limitation is made here, and the size of the anchor pile 501 in the figure is only to show the structure of the anchor pile 501. In actual use, the anchor pile 501 and related structures with matching size should be used according to the needs and cost problems. Correspondingly, the dredging suction head 4 can also use related components such as a cutter suction type, a rake suction type, a suction disc type, or a bucket type, which can be adjusted according to dredging needs.

[0036] Specifically, the flexible bag 506 has multiple and concentrically distributed upper and lower, and the air pipe 505 is provided with multiple air suction holes, and the multiple air suction holes are respectively corresponding to the multiple air pipes 505.

[0037] Multiple flexible bags 506 are simultaneously subjected to the air pumping or inflation work of the air pipe 505, intersecting with multiple small flexible bags 506 with the same volume only one large flexible bag 506. Multiple flexible bags 506 can accept more air suction holes for common action, and correspondingly, a more powerful air pump can be used to quickly perform air pumping or inflation work.

[0038] Specifically, the bottom end of the anchor pile 501 is provided with a sealing assembly 7 for closing or opening the bottom end of the anchor pile 501, the sealing assembly 7 comprises a fixed ring 701 slidingly installed in the anchor pile 501, the center of the fixed ring 701 is fixedly provided with a push plate oil cylinder 703, the output end of the push plate oil cylinder 703 faces downward and is fixedly connected with a plug plate 702 on the output end, a supporting ring 704 is fixedly connected in the anchor pile 501, the bottom of the supporting ring 704 is fixedly connected with a liquid pushing oil cylinder 705, the output end of the liquid pushing oil cylinder 705 faces downward and is fixedly connected to the top of the fixed ring 701, a plurality of drainage holes 706 are formed in the bottom of the anchor pile 501, and the diameters of the drainage holes 706 gradually decrease outward in the anchor pile 501.

[0039] Before the pile is lifted, the fixed ring 701 and the plug plate 702 need to be driven downward by the liquid pushing oil cylinder 705 to extrude seawater at the bottom of the anchor pile 501 outward through the drainage holes 706, help loosen the silt at the bottom of the anchor pile 501, and facilitate the seawater into the anchor pile 501, and then the anchor pile 501 is lifted by a distance, so that the lifting resistance can be reduced, or the liquid pushing oil cylinder 705 can be started at the same time when the anchor pile 501 is lifted to extrude seawater outward during the lifting process, thereby helping to reduce the required lifting resistance. It should be noted that the above lifting of the anchor pile 501 is only to lift a distance, and seawater needs to be filled in the anchor pile 501 thereafter.

[0040] When the anchor pile 501 is positioned and sunk, the output end of the push plate oil cylinder 703 is lowered to make the plug plate 702 staggered with the fixed ring 701, and seawater can enter the anchor pile 501 through the fixed ring 701, and when the seawater in the anchor pile 501 is extracted, the plug plate 702 needs to be driven upward by the push plate oil cylinder 703, the plug plate 702 is blocked below the fixed ring 701 to form a sealed space above the fixed ring 701, and the plug plate 702 is below the depth of the anchor pile 501 inserted into the silt, and the drainage holes 706 are distributed below the plug plate 702.

[0041] Specifically, the siphon water suction pipe 6 comprises a bend pipe 601 fixedly installed through the circumference of the anchor pile 501, the bottom end of the bend pipe 601 extends above the fixed ring 701, the water suction pipe 504 is a flexible pipe, and the bottom end of the water suction pipe 504 is fixedly connected with a filter screen 508, the bottom of the circumference of the water suction pipe 504 is fixedly connected with a buoyancy ring 507, and the buoyancy ring 507 provides buoyancy for the bottom end of the water suction pipe 504. With the rising of seawater, the bottom end of the water suction pipe 504 rises with the water surface.

[0042] Specifically, a plurality of partition plates 605 are fixedly connected with the bend pipe 601 through pipe sleeves, and the plurality of partition plates 605 are respectively arranged between the plurality of flexible bags 506.

[0043] When the anchor pile 501 is lowered, seawater and sand and stones are mixed together into the anchor pile 501, and the sand will affect the water pump of the water pumping pipe 504 when pumping.

[0044] The bent pipe 601 serves as a main body, when the water surface exceeds the high point of the bent pipe 601, the seawater is drained by using the siphon effect, and in the process of draining, the flexible bag 506 lifts the seawater height in the anchor pile 501 by extrusion, and the low end of the water pumping pipe 504 uses the buoyancy of the buoyancy ring 507 to make the water pumping pipe 504 be near the water surface, at this time, the bent pipe 601 and the water pumping pipe 504 absorb water in a high-low manner, the bent pipe 601 pumps out the water at the bottom of the anchor pile 501, and the water pumping pipe 504 pumps out the water at a lower height below the water surface, by using the sedimentation of the sand and stones, the water pumping pipe 504 pumps out the cleaner seawater above, and the bent pipe 601 pumps out the turbid seawater below, so that the sand or stones entering the water pumping pipe 504 can be reduced, and the blocking of the filter screen 508 can also reduce the entry of the sand or stones, and the suction of the sand into the water pump is reduced.

[0045] In the waiting stage of the pile lifting, due to the rapid contraction of the flexible bag 506 and the rapid transmission of the negative pressure in the anchor pile 501 to the external seawater of the anchor pile 501, the seawater will quickly flow into the anchor pile 501, and the partition plate 605 can slow down the rising speed of the seawater and weaken the possible situation that the seawater impacts the anchor pile 501, and correspondingly, the partition plate 605 at the connection position of the multiple flexible bags 506 can separate the flexible bags 506 when the flexible bags 506 are inflated, so that the flexible bags 506 have a hard support when being inflated.

[0046] Specifically, the siphon water pipe 6 further comprises a folding pipe 602 at one end of the bent pipe 601, the folding pipe 602 is located outside the anchor pile 501, the bottom of the bent pipe 601 and the bent pipe 601 are both fixedly connected with a fixed frame 603, and the two fixed frames 603 are jointly fixedly connected with a push pipe cylinder 604, and the folding pipe 602 is synchronously elongated when the push pipe cylinder 604 is elongated.

[0047] In the pile lifting stage, the push pipe cylinder 604 can be used to push the fixed frame 603 below the folding pipe 602 downward, and the folding pipe 602 is inserted into the seawater, so that the internal negative pressure space of the anchor pile 501 is communicated with the external seawater, and then the bent pipe 601 can be used to suck the external seawater in the anchor pile 501, and the external seawater is quickly sucked into the anchor pile 501 in cooperation with the lifted anchor pile 501, so that the time required for the seawater pressure balance inside and outside the anchor pile 501 is shortened.

[0048] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A pile positioning semi-submersible offshore dredging engineering equipment, comprising a working platform (1), a lower floating body (2) and a dredging platform (3), the lower floating body (2) is fixedly installed at the bottom of the working platform (1) through a supporting column, the dredging platform (3) is fixedly installed at the middle of the working platform (1) through a supporting frame, and a dredging suction head (4) is installed on the dredging platform (3) for carrying out dredging work below the working platform (1), characterized in that, Also include: The positioning pile assembly (5) is on both sides of the work platform (1), and the connecting pieces are fixedly installed on both sides of the work platform (1) and the lower floating body (2). The positioning pile assembly (5) is installed in the connecting piece. The positioning pile assembly (5) comprises an anchor pile (501) slidingly inserted in the connecting piece. The bottom end of the anchor pile (501) is provided with a sealing assembly (7) for closing or opening the bottom end of the anchor pile (501). The top plate of the anchor pile (501) is provided with a water suction pipe (504) and two air pipes (505) penetratingly installed in the middle part. The water suction pipe (504) is directly connected with a water pump. The water pump is used for pumping out seawater in the anchor pile (501). The anchor pile (501) is provided with a flexible bag (506) fixedly and inlaidly installed therein. The flexible bag (506) has a plurality of and is concentrically distributed upwards and downwards. The air pipe (505) is in the flexible bag (506). The air pipe (505) is connected with an air pump. The air pump is used for pumping out or supplementing the gas in the flexible bag (506). The anchor pile (501) is provided with a siphon water suction pipe (6) penetratingly and fixedly installed therein, which is used for assisting in discharging seawater in the anchor pile (501).

2. A pile positioning semi-submersible offshore dredging installation according to claim 1, characterized in that The outer side of the anchor pile (501) is fixedly provided with a gear (502). The bottom of the work platform (1) is fixedly provided with a motor. The output end of the motor is fixedly connected with a rack (503) engaged with the gear (502).

3. A pile positioning semi-submersible marine dredging installation according to claim 1, characterized in that A plurality of air suction holes are formed in the air pipe (505), and the plurality of air suction holes correspond to the plurality of air pipes (505) respectively.

4. A pile positioning semi-submersible offshore dredging installation according to claim 3, characterized in that The sealing assembly (7) comprises a fixed ring (701) slidingly installed in the anchor pile (501). The center of the fixed ring (701) is fixedly provided with a push plate oil cylinder (703). The output end of the push plate oil cylinder (703) faces downward, and the output end is fixedly connected with a plug plate (702).

5. A pile positioning semi-submersible offshore dredging installation according to claim 4, characterized in that The anchor pile (501) is fixedly connected with a support ring (704). The bottom of the support ring (704) is fixedly connected with a liquid pushing oil cylinder (705). The output end of the liquid pushing oil cylinder (705) faces downward and is fixedly connected to the top of the fixed ring (701). The bottom of the anchor pile (501) is provided with a plurality of drainage holes (706). The drainage holes (706) are gradually reduced in diameter outward in the anchor pile (501).

6. A pile positioning semi-submersible offshore dredging installation according to claim 4, characterized in that The siphon water suction pipe (6) comprises a bend pipe (601) penetratingly and fixedly installed on the circumferential side of the anchor pile (501). The bottom end of the bend pipe (601) extends above the fixed ring (701). The water suction pipe (504) is a flexible pipe, and the bottom end of the water suction pipe (504) is fixedly connected with a filter screen (508).

7. A pile positioning semi-submersible offshore dredging installation according to claim 6, characterized in that The circumferential side bottom of the water suction pipe (504) is fixedly connected with a buoyancy ring (507). The buoyancy ring (507) provides buoyancy for the bottom end of the water suction pipe (504). With the rising of seawater, the bottom end of the water suction pipe (504) rises with the water surface.

8. A pile positioning semi-submersible offshore dredging installation according to claim 7, characterized in that A plurality of partition plates (605) are fixedly connected to the bend pipe (601) through pipe sleeves. The plurality of partition plates (605) are respectively between the plurality of flexible bags (506).

9. A pile positioning semi-submersible offshore dredging installation according to claim 6, characterized in that The siphon water suction pipe (6) further comprises a folding pipe (602) at one end of the elbow pipe (601), the folding pipe (602) is outside the anchor pile (501), the bottom of the elbow pipe (601) and the elbow pipe (601) are fixedly connected with fixing frames (603), the two fixing frames (603) are fixedly connected with a push pipe cylinder (604) in common, when the push pipe cylinder (604) is elongated, the folding pipe (602) is synchronously elongated.

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