CN219621856U - Dredging system for positioning dredging under limited operation condition of high pile wharf beam plate - Google Patents

Abstract

The utility model discloses a dredging system for positioning dredging under the limited operation condition of a beam plate of a high-pile wharf, which comprises a low-topsides semi-submersible type cutter suction vessel, a mud conveying assembly, a high-power pumping vessel and a mud barge, wherein one end of the mud conveying assembly is connected with the low-topsides semi-submersible type cutter suction vessel, the other end of the mud conveying assembly is connected with the high-power pumping vessel, the high-power pumping vessel is connected with the mud barge, the low-topsides semi-submersible type cutter suction vessel comprises a main truss and two lifting windlass, the two lifting windlass are respectively connected with a steel wire rope, the main truss is sleeved on the front of the steel wire rope and positioned at the lower end of the low-topsides semi-submersible type cutter suction vessel, and a small double reamer is arranged on the main truss. The utility model can avoid the influence of height limitation and tide of the high-pile wharf structure beam plate in the construction of the existing water transportation port wharf by adopting the economic novel low-freeboard semi-submerged cutter suction ship to carry out dredging operation under the high-pile beam plate.

Description

Dredging system for positioning dredging under limited operation condition of high pile wharf beam plate

Technical Field

The utility model relates to the technical field of dredging under limited operation conditions of a high-pile wharf beam plate in construction and operation of a water transportation port wharf, in particular to a dredging system for positioning dredging under limited operation conditions of the high-pile wharf beam plate.

Background

Sediment accumulation problems commonly exist under high pile wharf beams in the construction and operation of water transportation ports and wharfs, and the problems need to be maintained through dredging.

The existing dredging mode mainly utilizes a standard cutter-suction ship, the standard cutter-suction ship has higher overseas dispatching cost, the economical efficiency is poor under the condition of small dredging capacity, the ship topside of the existing standard cutter-suction ship is higher, the conventional standard cutter-suction ship can not carry out dredging operation under the high-pile wharf beam plate in most port water areas due to the problem of height limitation from the high-pile wharf beam plate to the water surface, and the cutter-suction ship can only enter the port to carry out dredging operation in a small part of port water areas and only in a low tide level time period. Meanwhile, after the existing standard ship-shaped cutter suction ship enters the lower part of the beam plate of the high-pile wharf, the ship can be positioned and fixed only by temporary measures, and plane positioning dredging of transverse and longitudinal positions cannot be performed accurately, and particularly, the cutter-suction ship cannot perform operation aiming at a dredging area in the middle of a pile body structure under the high-pile wharf, which is constructed.

In addition, the cutter head blades of the existing standard boat-shaped cutter suction boat are bigger and not easy to replace, and have weak adaptability to soil layers, especially to clay geology, so that dredging construction is affected, the work efficiency of the dredging construction is too low, and the time required by the dredging operation is greatly prolonged.

Disclosure of Invention

The utility model aims at solving the technical problems of the prior art dredging mode, and provides a dredging system which adopts an economic and novel low-freeboard semi-submersible type cutter suction dredger to carry out high-pile beam plate dredging operation, can avoid the influence of height limitation and tides of the high-pile wharf beam plate in the existing water-borne port wharf construction structure, can greatly improve the effective operation time of dredging operation, improves the dredging operation efficiency, can flexibly move and fix the low-freeboard semi-submersible type cutter suction dredger through an anchor cable pulley positioning mechanism, ensures the dredging operation precision and construction stability, and improves the clay layer excavation efficiency and pumping conveying efficiency.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the dredging system comprises a low-topside semi-submersible cutter suction boat, a mud conveying assembly, a high-power pump suction boat and a mud barge, wherein one end of the mud conveying assembly is connected with the low-topside semi-submersible cutter suction boat, the other end of the mud conveying assembly is connected with the high-power pump suction boat, the high-power pump suction boat is connected with the mud barge, the low-topside semi-submersible cutter suction boat comprises a main truss and two lifting windlass, steel wire ropes are respectively connected to the two lifting windlass, the main truss is sleeved on the lower end of the low-topside semi-submersible cutter suction boat before being sleeved on the steel wire ropes, a small double reamer is installed on the main truss, a tug boat is installed at the bottom of the mud barge, the mud barge is towed to the dredger, and the two lifting windlass controls the angle of the main truss through controlling the steel wire ropes, so that the dredging depth of the double reamer is controlled.

As a further improvement of the above technical solution, the mud conveying assembly comprises a mud conveying pipe and a mud floating hose, one end of the mud conveying pipe is connected with one end of the mud floating hose, the other end of the mud floating hose is connected with the high-power pumping vessel, the mud conveying pipe is led out from a small double-reamer to ascend to the vicinity of the water surface along a main truss of the low-freeboard semi-submersible winch, the low-freeboard semi-submersible winch is connected to the high-power pumping vessel through the mud floating hose at the stern, the low-freeboard semi-submersible winch is connected to the high-power pumping vessel through the mud conveying pipe and the mud floating hose, the high-power pumping vessel is moored at the peripheral position of the high-pile wharf through adjusting the length of the mud floating hose, the low-freeboard semi-submersible winch is moored at the dredging position under the beam plate of the high-pile wharf, and the mud barge is moored at the periphery of the high-power pumping vessel.

As a further improvement of the technical scheme, the dredging system further comprises an anchor rope pulley positioning mechanism, wherein the anchor rope pulley positioning mechanism comprises an anchor rope, two pulley walking control windlass, two tensioning control windlass, a steel wire rope component and a plurality of groups of pile area pulley blocks, the anchor rope is arranged at the bow and the stern 2 of the high-power pumping vessel, the two pulley walking control windlass and the two tensioning control windlass are arranged at the bow of the high-power pumping vessel, each pulley walking control windlass is positioned at one side of each tensioning control windlass, each group of pile area pulley blocks are arranged at the operation position of the low-freeboard semi-submerged type pumping vessel at intervals, and each group of pile area pulley blocks is used for connecting the high-power pumping vessel with the low-freeboard semi-submerged type pumping vessel through two tensioning steel wires and two walking steel wires.

As a further improvement of the above technical solution, the anchor lines comprise a front splayed anchor line and a rear splayed anchor line, the front splayed anchor line is mounted on the bow of the high-power pumping vessel, and the rear splayed anchor line is mounted on the stern of the high-power pumping vessel.

As a further improvement of the technical scheme, the middle part of the low-freeboard semi-submersible type cutter suction ship is arranged to be of an open structure, and the other end of the mud conveying pipe is fixed on the main truss.

As a further improvement of the technical scheme, the periphery of the low-freeboard semi-submersible type winch is provided with a positioning winch, and both a lifting winch and the positioning winch on the low-freeboard semi-submersible type winch adopt a sinking structure.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The dredging system comprises a low-freeboard semi-submersible type cutter suction dredger, a mud conveying assembly, a high-power pump suction boat and a mud barge, wherein one end of the mud conveying assembly is connected with the low-freeboard semi-submersible type cutter suction boat, the other end of the mud conveying assembly is connected with the high-power pump suction boat, the high-power pump suction boat is connected with the mud barge, the low-freeboard semi-submersible type cutter suction boat comprises a main truss and two lifting windlass, steel wire ropes are respectively connected to the two lifting windlass, the main truss is sleeved on the steel wire ropes and is positioned at the lower end of the low-freeboard semi-submersible type cutter suction boat, a small double reamer is mounted on the main truss, and the two lifting windlass controls the angle of the main truss through controlling the steel wire ropes. According to the utility model, the low-freeboard semi-submerged cutter suction boat with the low freeboard is used for dredging operation under the high-pile beam plate, so that the influence of height limitation and tide of the high-pile wharf beam plate in the existing water-borne port wharf construction structure can be avoided, the effective operation time of dredging operation is greatly prolonged, and the dredging operation efficiency is improved. In addition, the double reamer adopted in the dredging system is a small double reamer and a professional high-power pumping boat, a mud conveying pipe and a mud floating hose integrated system, so that the clay layer excavation efficiency and pumping conveying efficiency can be improved, different reamer cutting systems and proper pumping conveying pipeline integrated systems can be flexibly selected according to different projects and different geological conditions, the optimal working efficiency is achieved, and the engineering applicability is strong.

(2) The dredging system also comprises an anchor cable pulley positioning mechanism, wherein the anchor cable pulley positioning mechanism consists of an anchor cable, two pulley walking control winches, two tensioning control winches, a steel wire rope assembly and a plurality of groups of pile area pulley blocks, the anchor cable is arranged at the bow and the stern 2 of the high-power pumping vessel, the two pulley walking control winches and the two tensioning control winches are arranged at the bow of the high-power pumping vessel, each pulley walking control winch is positioned at one side of each tensioning control winch, each group of pile area pulley blocks are arranged at the operation position of the low-topsides semi-submerged type winch at intervals, and each group of pile area pulley blocks connects the high-power pumping vessel with the low-topsides semi-submerged type winch through the two tensioning steel wires and the two walking steel wires. The utility model can flexibly move and position and fix the novel economic cutter suction dredger through the anchor cable pulley positioning mechanism, can accurately realize plane positioning dredging of transverse and longitudinal positions, improves the dredging operation quality, and ensures the dredging operation precision and the construction stability.

Drawings

FIG. 1 is a schematic diagram of the structure of the novel and economical cutter suction dredger system.

FIG. 2 is an enlarged schematic view of a detail of the novel and economical cutter suction dredger system of the present utility model.

FIG. 3 is a detailed enlarged schematic diagram of the novel and economical cutter suction dredger system of the present utility model.

FIG. 4 is a schematic diagram of the novel and economical cutter suction dredger system of the present utility model.

In the figure: the dredging system 1, the low freeboard semi-submersible cutter suction dredger 11, the main truss 111, the double reamer 112, the lifting winch 113, the steel wire rope 114, the high-power pump suction boat 12, the mud conveying assembly 13, the mud conveying pipe 131, the mud floating hose 132, the mud barge 14, the anchor rope pulley positioning mechanism 2, the anchor rope 21, the front splayed anchor rope 211, the rear splayed anchor rope 212, the pulley walking control winch 22, the tensioning control winch 23, the steel wire rope assembly 24, the tensioning steel wire rope 241, the walking steel wire rope 242 and the pile area pulley block 25.

Detailed Description

The present utility model is described in detail below with reference to the accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the principles of the utility model by way of example, and, together with the description, serve to explain the principles of the utility model. In the drawings to which reference is made, the same or similar components in different drawings are denoted by the same reference numerals.

As shown in fig. 1 to 4, the present utility model provides a dredging system 1 for positioning dredging under limited operation conditions under a beam plate of a high pile wharf, the dredging system 1 comprises a low-freeboard semi-submersible cutter suction vessel 11, a mud delivery assembly 13, a high-power pumping vessel 12 and a dredger 14, one end of the mud delivery assembly 13 is connected with the low-freeboard semi-submersible cutter suction vessel 11, the other end of the mud delivery assembly 13 is connected with the high-power pumping vessel 12, the high-power pumping vessel 12 is connected with the dredger 14, the low-freeboard semi-submersible cutter suction vessel 11 comprises a main truss 111 and two lifting windlass 113, the two lifting windlass 113 are respectively connected with a steel wire rope 114, the main truss 111 is sleeved on the steel wire rope 114 and is positioned at the lower end of the low-freeboard semi-submersible cutter suction vessel 11, a small double reamer 112 is installed on the main truss 111, the two lifting windlass 113 controls the angle of the main truss 111 through controlling the steel wire rope 114, further controlling the dredging depth of the small double reamer 112, in particular, the mud conveying assembly 13 comprises a mud conveying pipe 131 and a mud floating hose 132, one end of the mud conveying pipe 131 is connected with one end of the mud floating hose 132, the other end of the mud floating hose 132 is connected with the high-power pumping vessel 12, the mud conveying pipe 131 is led out from the small double reamer 112 to rise to the vicinity of the water surface along the main truss 111 of the low-freeboard semi-submerged reamer 11, the low-freeboard semi-submerged reamer 11 is connected to the high-power pumping vessel 12 through the mud floating hose 132 at the stern, the low-freeboard semi-submerged reamer 11 is connected to the high-power pumping vessel 12 through the mud conveying pipe 131 and the mud floating hose 132, the high-power pumping vessel 12 can be moored at the peripheral position of the high-pile wharf through adjusting the length of the mud floating hose 132, the low-freeboard semi-submerged reamer 11 is moored at the dredging position under the high-pile wharf beam plate, the mud barge 14 is stopped at the outer circumference of the high power boat 12.

The utility model performs sediment excavation through the small double reamer 112 of the low-freeboard semi-submersible cutter suction dredger 11, and the excavated sediment is sucked into the high-power pump suction dredger 12 from the sediment conveying pipe 131 under the combined action of the high-power pump suction dredger 12, the sediment conveying pipe 131 and the sediment floating hose 132, and finally is conveyed into the mud barge 14 through the discharge end of the high-power pump suction dredger 12. When the dredger 14 is filled with dredged water and sediment, that is, the dredger 14 is filled with dredged materials, the low-freeboard semi-submersible cutter suction boat 11 stops dredging operation, the lifting winch 113 lifts the small double reamer 112 on the main truss 111 to water, sails to a designated mud throwing area, and empties sediment in a cabin through a mud door arranged at the bottom of the dredger 14 or sucks out mud from the dredger through a mud suction pipe arranged on the dredger 14 by a mud pump on the boat, so that the dredger 14 throws the dredged materials outwards.

The dredging system 1 further comprises an anchor cable pulley positioning mechanism 2, wherein the anchor cable pulley positioning mechanism 2 comprises an anchor cable 21, two pulley travelling control winches 22, two tensioning control winches 23, a steel wire rope assembly 24 and a plurality of groups of pile area pulley blocks 25, the anchor cable 21 is arranged at the bow and stern 2 of the high-power pumping vessel 12, the two pulley travelling control winches 22 and the two tensioning control winches 23 are arranged at the bow of the high-power pumping vessel 12, each pulley travelling control winch 22 is positioned at one side of each tensioning control winch 23, each group of pile area pulley blocks 25 are arranged at the operation position of the low-freeboard semi-submerged type pumping vessel 11 in a mutually-spaced mode, and each group of pile area pulley blocks 25 is used for connecting the high-power pumping vessel 12 with the low-freeboard semi-submerged type pumping vessel 11 through two tensioning steel wires 241 and two travelling steel wires 242. In particular, anchor lines 21 include a front splayed anchor line 211 and a rear splayed anchor line 212, with the front splayed anchor line 211 being mounted on the bow of the power boat 12 and the rear splayed anchor line 212 being mounted on the stern of the power boat 12.

In the specific implementation, the low-freeboard semi-submersible cutter suction dredger 11 of the present utility model is launched after being constructed by welding on site, the length of the low-freeboard semi-submersible cutter suction dredger 11 is 10.0m, the width is 1.8m, the depth is 0.7m, the middle part of the low-freeboard semi-submersible cutter suction dredger 11 is set to be an open structure, and the other end of the mud conveying pipe 131 is fixed on the main truss 111. The periphery of the low-freeboard semi-submersible winch-suction ship 11 is provided with a positioning winch, and the lifting winch 113 and the positioning winch on the low-freeboard semi-submersible winch-suction ship 11 are of a sinking structure.

The utility model provides a specific operation process of dredging under a high pile wharf board, which relates to a dredging system 1, comprising the following steps:

the dredging system 1 is positioned according to an under-board dredging position, wherein a low-topside semi-submersible cutter suction vessel 11 is moored at the under-board dredging position, a high-power pump suction vessel 12 is moored at a corresponding position on the periphery of a wharf, a mud barge 14 is parked near the high-power pump suction vessel 12, a mud conveying pipe 131 is led out from a small double-reamer 112, rises to the vicinity of the water surface along a main truss 111 of the low-topside semi-submersible cutter suction vessel 11, is connected to the high-power pump suction vessel 12 through a mud floating hose 132 at the stern, and after water filtering treatment, dredges are conveyed to the mud barge 14 for external transportation;

when in construction, the anchor cable pulley positioning mechanism 2 is positioned, after the dredging position is positioned by the anchor cable pulley positioning mechanism 2, dredging operation is started, the angle of the main truss 111 and the dredging depth of the small double reamer 112 are controlled by controlling the lifting of the two lifting winches 113 on the main truss 111, the dredging operation is carried out layer by layer from shallow to deep, after the designated dredging depth is reached, the anchor cable pulley positioning mechanism 2 is used for shifting, and the next dredging operation is continued;

the front splayed anchor cable 211 and the rear splayed anchor cable 212 are respectively arranged at the bow and the stern of the high-power pumping vessel 12, two pulley walking control winches 22 are arranged at the bow, two tensioning control winches 23 are respectively arranged at the bow and the stern of the low-freeboard semi-submerged winch 11, a plurality of groups of pile area pulley blocks 25 are arranged in pile areas in the working range of the low-freeboard semi-submerged winch 11, the plurality of groups of pile area pulley blocks 25 are connected with the high-power pumping vessel 12 and the low-freeboard semi-submerged winch 11 through two tensioning steel wire ropes 241 and two walking steel wire ropes 242, the high-power pumping vessel 12 and the low-freeboard semi-submerged winch 11 are connected, the longitudinal and transverse position accurate plane positioning of the low-freeboard semi-submerged winch 11 is realized, the two walking steel wire ropes 242 are connected to the pile area pulley blocks 25 arranged in the pile areas from the pulley walking control winches 22 at the bow of the high-power pumping vessel 12, then the two walking steel wire ropes 242 are connected to the pile area pulley blocks 25 arranged in the pile areas, and the low-freeboard semi-submerged winch 11 is connected to the cable semi-submerged winch 11, and the tensioning control winch 11 is directly connected to the cable semi-submerged winch 11 from the bow of the low-freeboard semi-submerged winch 11.

The utility model provides a specific positioning dredging operation process of the anchor cable pulley positioning mechanism 2 under the high pile wharf in the dredging system 1, which comprises the following steps:

and (3) carrying out preliminary positioning at the periphery of the high pile wharf: firstly, the high-power pumping vessel 12 is moored at the periphery of a high-pile wharf and positioned at the corresponding peripheral position of a dredging construction position under a high-pile wharf deck, the front splayed anchor cable 211 and the rear splayed anchor cable 212 are laid down at the bow and the stern of the high-power pumping vessel 12, the front splayed anchor cable 211 and the rear splayed anchor cable 212 are used for positioning, the hull can be kept stable, then the low-freeboard semi-submerged winch 11 is moored in front of the high-power pumping vessel 12, the high-power pumping vessel 12 is connected through two tensioning steel wires 241, the high-power pumping vessel 12 is connected to each group of pile area pulley blocks 25 and the high-power pumping vessel 12 through two tensioning steel wires 242, the high-power pumping vessel 12 is connected with the low-freeboard semi-submerged winch 11 through the two tensioning steel wires 241 and the two walking steel wires 242, and the high-power pumping vessel 11 is provided with an adjusting and positioning function, and at this time, the two pulley walking control winches 22 and the two tensioning control winches 23 are kept in a primary tensioned state.

And (3) longitudinal forward positioning construction: firstly, the two tensioning control winches 23 are loosened, the two tensioning wire ropes 241 are kept loose, then, the two pulley travelling control winches 22 are slowly started to start, the two travelling wire ropes 242 gradually pull the low-freeboard semi-submersible winch 11 to travel forwards through the transmission function of the pile area pulley block 25, after the ship body reaches a specified longitudinal position, the two pulley travelling control winches 22 are closed, the two tensioning control winches 23 are started, the two tensioning wire ropes 241 are kept tensioned, and at the moment, the two tensioning wire ropes 241 and the two travelling wire ropes 242 respectively perform firm positioning of longitudinal forward movement on the low-freeboard semi-submersible winch 11 from four corners.

And (3) longitudinal backward moving positioning construction: first, the two pulley traveling control winches 22 are loosened, the two traveling wire ropes 242 are kept loose, then, the two tensioning control winches 23 are slowly started to be started, the two tensioning wire ropes 241 gradually pull the low-freeboard semi-submersible winch 11 to travel backward, after the ship body reaches a specified longitudinal position, the two tensioning control winches 23 are closed, the two pulley traveling control winches 22 are started, the two traveling wire ropes 242 are kept tensioned, and at this time, the two tensioning wire ropes 241 and the two traveling wire ropes 242 respectively perform firm positioning of longitudinal backward movement on the low-freeboard semi-submersible winch 11 from four corners.

And (3) transverse left side moving positioning construction: firstly, loosening a right tensioning control winch 23 and a pulley traveling control winch 22, keeping the right tensioning wire rope 241 and the pulley traveling control winch 242 loose, then slowly starting to start the left tensioning control winch 23 and the pulley traveling control winch 22, gradually pulling a low-freeboard semi-submersible winch 11 to move leftwards by one tensioning wire rope 241 and one traveling wire rope 242 on the left through the transmission action of a pile area pulley block 25, closing the left tensioning control winch 23 and the pulley traveling control winch 22 after the ship body reaches a specified longitudinal position, starting the right tensioning control winch 23 and the pulley traveling control winch 22, and keeping the left tensioning wire rope 241 and one traveling wire rope 242, wherein the two tensioning wire ropes 241 and the two traveling wire ropes 242 respectively carry out firm positioning of transverse left movement on the low-freeboard semi-submersible winch 11;

and (3) transverse right side moving positioning construction: first, the left tension control winch 23 and the pulley travel control winch 22 are loosened, the left tension wire rope 241 and the pulley travel control winch 22 are kept loose, then the right tension control winch 23 and the pulley travel control winch 22 are slowly started, one tension wire rope 241 and one travel wire rope 242 on the right gradually pull the low-freeboard semi-submersible winch 11 to travel to the right through the transmission action of the pile section pulley block 25, after the ship body reaches a specified longitudinal position, the right tension control winch 23 and the pulley travel control winch 22 are closed, the left tension control winch 23 and the pulley travel control winch 22 are started, and one tension wire rope 241 and one travel wire rope 242 on the right are kept tensioned, at this time, the two tension wire ropes 241 and the two travel wire ropes 242 respectively perform the firm positioning of the transverse right movement of the low-freeboard semi-submersible winch 11 from four corners.

The foregoing detailed description of the utility model has been presented for purposes of illustration and description, but is not intended to limit the scope of the utility model, i.e., the utility model is not limited to the details shown and described.

Claims (6)

1. A dredging system for positioning dredging under the limited operation condition of a high pile wharf beam plate is characterized in that: the dredging system comprises a low-freeboard semi-submersible type cutter suction dredger, a mud conveying assembly, a high-power pump suction boat and a mud barge, one end of the mud conveying assembly is connected with the low-freeboard semi-submersible type cutter suction boat, the other end of the mud conveying assembly is connected with the high-power pump suction boat, the high-power pump suction boat is connected with the mud barge, the low-freeboard semi-submersible type cutter suction boat comprises a main truss and two lifting windlass, steel wire ropes are respectively connected to the two lifting windlass, the main truss is sleeved on the lower end of the low-freeboard semi-submersible type cutter suction boat before being positioned on the steel wire ropes, and a small double reamer is installed on the main truss.

2. Dredging system according to claim 1, wherein the dredging system is positioned for dredging under limited operating conditions of the high pile quay deck: the mud conveying assembly comprises a mud conveying pipe and a mud floating hose, one end of the mud conveying pipe is connected with one end of the mud floating hose, the other end of the mud floating hose is connected with a high-power pumping boat, the mud conveying pipe is led out from a small double-reamer to ascend to the vicinity of the water surface along a main truss of a low-freeboard semi-submersible winch, the low-freeboard semi-submersible winch is connected to the high-power pumping boat through the mud floating hose at the stern, the low-freeboard semi-submersible winch is connected to the high-power pumping boat through the mud conveying pipe and the mud floating hose, the high-power pumping boat is moored at the peripheral position of a high-pile wharf through adjusting the length of the mud floating hose, the low-freeboard semi-submersible winch is moored at the dredging position under a high-pile wharf beam plate, and the low-freeboard semi-submersible winch is moored at the periphery of the high-power pumping boat.

3. Dredging system according to claim 1, wherein the dredging system is positioned for dredging under limited operating conditions of the high pile quay deck: the dredging system further comprises an anchor cable pulley positioning mechanism, the anchor cable pulley positioning mechanism comprises an anchor cable, two pulley walking control windlass, two tensioning control windlass, a steel wire rope component and a plurality of groups of pile area pulley blocks, the anchor cable is arranged at the bow and the stern 2 of the high-power pumping boat, the two pulley walking control windlass and the two tensioning control windlass are arranged at the bow of the high-power pumping boat, each pulley walking control windlass is arranged at one side of each tensioning control windlass, each group of pile area pulley blocks are arranged at the operation position of the low-freeboard semi-submerged winch at intervals, and each group of pile area pulley blocks connects the high-power pumping boat with the low-freeboard semi-submerged winch through two tensioning steel wires and two walking steel wires.

4. A dredging system for positioning dredging under limited operating conditions under a high pile quay deck according to claim 3, wherein: the anchor cable comprises a front splayed anchor cable and a rear splayed anchor cable, the front splayed anchor cable is arranged at the bow of the high-power pumping vessel, and the rear splayed anchor cable is arranged at the stern of the high-power pumping vessel.

5. Dredging system according to claim 2, wherein the dredging system is positioned for dredging under limited operating conditions of the high pile quay deck: the middle part of the low-freeboard semi-submersible type cutter suction dredger is arranged to be of an open structure, and the other end of the dredger pipe is fixed on the main truss.

6. Dredging system according to claim 1, wherein the dredging system is positioned for dredging under limited operating conditions of the high pile quay deck: the periphery of the low-freeboard semi-submersible type winch and suction boat is provided with a positioning winch, and both a lifting winch and the positioning winch on the low-freeboard semi-submersible type winch and suction boat adopt a sinking structure.