CN118327087A - Large-scale cutter suction dredger series connection construction system under long blowing distance working condition - Google Patents

Abstract

The invention relates to a series connection construction system of a large cutter suction dredger under a long blowing distance working condition. Comprises a cutter suction dredger and at least one relay cutter suction ship positioned behind the cutter suction dredger, wherein the adjacent ships are connected by adopting a sludge discharge pipeline; the relay cutter suction dredger comprises a relay ship body, a buoyancy sand hopper is arranged in a groove where an original reamer bridge is located, a first slurry pump and a second slurry pump are arranged in the relay ship body, an input pipeline and a first extraction pipeline are connected to an inlet of the first slurry pump, the first extraction pipeline is connected to an extraction port of the side part of the buoyancy sand hopper, a second extraction pipeline is connected to an inlet of the second slurry pump, the second extraction pipeline is connected to an extraction port of the side part of the buoyancy sand hopper, an outlet of the first slurry pump is connected to an inlet of the second slurry pump through a serial pipeline, a first discharge pipeline is further connected to an outlet of the first slurry pump, and a second discharge pipeline is further connected to an outlet of the second slurry pump. The invention improves the total delivery lift of the slurry pump and the blowing distance of the dredging slurry.

Description

Large-scale cutter suction dredger series connection construction system under long blowing distance working condition

Technical Field

The invention belongs to the technical field of dredging engineering equipment, and particularly relates to a series construction system of a large cutter suction dredger under a long blowing distance working condition.

Background

When the cutter suction dredge, the reamer is used for loosening the submarine soil, and then the mud is sucked from the mud suction pipe by the mud pump and pumped to the mud receiving area through the mud discharge pipeline for hydraulic filling. And once the distance between the sludge discharge pipeline is too long (called a long-blowing distance working condition), the efficiency of the cutter suction dredger is greatly reduced. Aiming at the problem of ultra-long-distance hydraulic reclamation construction which cannot be realized by the conveying capacity of a single cutter suction dredger, the international common method is to increase the quantity of relay dredger pumps to improve the blowing distance, and the effect of increasing the blowing distance is usually achieved by adopting a mode of a relay dredger or a land pump station. For example, in the dredging engineering of the navigation channel of the south China, the long-row-distance construction is carried out through a large-scale non-self-propulsion cutter suction boat, a new sea shark wheel and a first-propulsion articulated relay pump boat, and the conveying distance is as far as more than 27 km. However, in some specific construction scenarios, due to limitations in objective conditions, there is generally a lack of a booster pump vessel matched with a large cutter suction vessel for use, and there is also no available matched vessel on the market, such as a custom-matched booster pump vessel, which requires very high time and economic costs, and cannot meet engineering requirements.

Meanwhile, in the dredging construction scene, the strong pumping capacity of the cutter suction dredger is considered, the pumping capacity of the cutter suction dredger is fully exerted to carry out relay conveying on dredging mud, and the cutter suction dredger is a feasible solution for solving the problem of conveying and blowing and filling mud to a mud receiving area under the potential long-blowing-distance working condition. The total delivery lift of the slurry pump is improved in a mode of connecting the relay cutter suction ship in series behind the construction main ship, so that the operation requirements of construction parameters such as slurry flow rate and the like are met, and dredging construction under the working condition of a large cutter suction ship long blowing distance is realized. However, the cutter suction dredger is adopted as a construction scheme of a relay ship, namely, a scheme of cutter suction dredger serial connection construction is not used for directly connecting pipelines of the cutter suction dredger end to end, and a serial connection construction system needs to be developed and designed.

Disclosure of Invention

The invention aims to provide a large cutter-suction dredger series connection construction system under a long-blowing-distance working condition, which improves the total conveying lift of a slurry pump by connecting a relay cutter-suction dredger in series after a cutter-suction dredger, improves the blowing distance of dredged slurry and realizes the dredging construction effect under the long-blowing-distance working condition of the large cutter-suction dredger.

The technical scheme adopted by the invention is as follows: a serial construction system of large-scale cutter-suction dredgers under the working condition of long blowing distance comprises a cutter-suction dredger and at least one relay cutter-suction dredger positioned behind the cutter-suction dredger, wherein a sludge discharge pipeline is adopted between the cutter-suction dredger and the relay cutter-suction dredger and between adjacent relay cutter-suction dredgers, and the last relay cutter-suction dredger is connected to a sludge receiving area through the sludge discharge pipeline; the relay cutter suction dredger is formed by reforming a cutter suction dredger and comprises a relay ship body from which a reamer bridge is removed, a buoyancy sand hopper with an open top is arranged in a groove in which an original reamer bridge is arranged, a first slurry pump and a second slurry pump are arranged in the relay ship body, an input pipeline and a first extraction pipeline are connected to the inlet of the first slurry pump, the input pipeline extends to the stern of the relay ship body and is in butt joint with a sludge discharge pipeline, the first extraction pipeline is connected to an extraction port on the side part of the buoyancy sand hopper, a second extraction pipeline is connected to the inlet of the second slurry pump, the second extraction pipeline is connected to an extraction port on the side part of the buoyancy sand hopper, the outlet of the first slurry pump is connected to the inlet of the second slurry pump through a serial pipeline, a first discharge pipeline is also connected to the outlet of the first slurry pump, the first discharge pipeline and the second discharge pipeline are connected to a three-way pipeline arranged at the bow position, and the third port of the three-way pipeline is in butt joint connection with the sludge discharge pipeline; gate valves are installed on the input pipeline, the first extraction pipeline, the second extraction pipeline, the serial pipeline and the first discharge pipeline.

Preferably, a third extraction pipeline is further connected to the inlet of the first slurry pump, a gate valve is mounted on the third extraction pipeline, the third extraction pipeline is connected to the extraction ports on the side portion of the buoyancy sand hopper, and the extraction ports connected with the first extraction pipeline and the third extraction pipeline are respectively located on two sides of the buoyancy sand hopper.

Preferably, the device further comprises a water pumping pipeline with a vacuum release valve, wherein the upper end of the water pumping pipeline is connected to the inlet of the first slurry pump, the other end of the water pumping pipeline extends to the bottom of the relay ship body, the vacuum release valve is opened when the vacuum degree in the pipeline reaches a set value, and surrounding water enters the pipeline through the water pumping pipeline.

Preferably, a pre-pump pressure sensor for detecting the pressure inside the pipe is also installed on the inlet pipe of the first slurry pump.

Preferably, the first discharge pipeline and/or the second discharge pipeline and/or the three-way pipeline are/is provided with a pressure relief exhaust valve, and the pressure relief exhaust valve is opened for pressure relief when the internal pressure of the pipeline reaches a set value.

Preferably, windlass used for traction positioning of the relay suction dredger is arranged on both sides of the bow and both sides of the stern of the relay ship body.

Preferably, pipeline filters are arranged on the sludge discharge pipelines between the cutter suction dredger and the relay cutter suction dredger and on the sludge discharge pipelines between the adjacent relay cutter suction dredgers, the pipeline filters comprise filter shells with openable cleaning holes, cone blocking nets are arranged in the filter shells, and the tip ends of the cone blocking nets face to the direction opposite to the conveying direction of the slurry.

The invention has the advantages and positive effects that:

the invention provides a serial construction system of large cutter-suction dredgers under a long-blowing-distance working condition, which is characterized in that an existing cutter-suction dredger is modified into a relay cutter-suction dredger and is connected with a cutter-suction dredger in series by adopting a sludge discharge pipeline, and dredged sludge obtained by excavating the cutter-suction dredger is subjected to the relay pumping action of the relay cutter-suction dredger, so that the total conveying lift of a sludge pump is improved, the blowing distance of the dredged sludge is improved by connecting the relay cutter-suction dredger in series behind the cutter-suction dredger, and the dredging construction effect of the large cutter-suction dredger under the long-blowing-distance working condition is realized.

The series construction system fully utilizes the stronger pumping capacity of the cutter suction dredger equipment to dredge mud, the relay cutter suction dredger is improved on the basis of the original cutter suction dredger, the conveying capacity of the cutter suction dredger to mud is fully exerted on the basis of the integral structure of the original cutter suction dredger, and the cutter suction dredger is enabled to have richer capacity of carrying out relay pumping to dredged mud by adding a buoyancy sand hopper and optimally designing a mud pipeline on the ship.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic top view of a cutter suction dredger, a dredger pipeline and a relay cutter suction dredger according to the present invention;

fig. 3 is a schematic top view of the relay suction dredger of fig. 2.

In the figure:

1. Cutter suction dredger; 2. a sludge discharge line; 3. a relay cutter suction ship; 3-1, relay ship body; 3-2, buoyancy sand hopper; 3-3, a winch; 3-4, a first slurry pump; 3-5, a second slurry pump; 3-6, a water pumping pipeline; 3-7, an input pipeline; 3-8, a first extraction pipeline; 3-9, a third extraction pipeline; 3-10, a second extraction pipeline; 3-11, connecting pipelines in series; 3-12, a pump front pressure sensor; 3-13, a first discharge conduit; 3-14, a second discharge pipe; 3-15, a pressure relief exhaust valve; 3-16, three-way pipeline; 4. a mud receiving area; 5. pipeline filter.

Detailed Description

In order to further understand the summary, features and advantages of the present invention, the following examples are set forth in detail.

Referring to fig. 1, the large cutter-suction dredger series construction system under the long blowing distance working condition of the invention comprises a cutter-suction dredger 1 and at least one relay cutter-suction dredger 3 positioned behind the cutter-suction dredger 1, wherein the cutter-suction dredger 1 and the relay cutter-suction dredger 3 are connected with each other by adopting a mud discharge pipeline 2, and the last relay cutter-suction dredger 3 is connected to a mud receiving area 4 by the mud discharge pipeline 2. The cutter suction dredger 1 is responsible for dredging and excavating operations, dredging slurry is generated in the process of the operations, the dredging slurry is conveyed to each relay cutter suction vessel 3 at the rear through a mud discharge pipeline 2, and the relay cutter suction vessels 3 perform relay pumping on the dredging slurry, so that the blowing distance of the dredging slurry can be expanded, the dredging construction effect of the large cutter suction vessel under the working condition of long blowing distance is realized, and finally the dredging slurry is smoothly conveyed to a mud receiving area 4 for blowing and filling.

Normally, the number of series connection stages of the cutter suction dredger is two, so that the field construction requirement can be met, and a specific description of the two-stage structural form is given in this embodiment, please refer to fig. 2. At this time, the large cutter-suction dredger series construction system under the working condition of long blowing distance comprises a cutter-suction dredger 1 and a relay cutter-suction dredger 3 arranged at the rear of the cutter-suction dredger, wherein the cutter-suction dredger 1 and the relay cutter-suction dredger are connected through a mud discharge pipeline 2, and the relay cutter-suction dredger 3 is connected to a mud receiving area 4 through another mud discharge pipeline 2 to perform blowing filling of enlarging blowing distance on dredged mud.

The cutter-suction dredger 1 is selected as an existing cutter-suction dredger, has the capability of autonomous dredging construction, during construction, a reamer bridge is lowered into water, the reamer at the end is dropped on the water bottom mud surface, after the reamer is started, the reamer cuts the water bottom mud surface to loosen the water bottom mud surface, an underwater mud pump arranged on the reamer bridge pumps broken mud together with surrounding water, two mud pumps additionally arranged on the cutter-suction dredger 1 pump dredging mud, and finally the dredging mud enters a mud discharge pipeline 2 at the rear side through a mud pipeline of the cutter-suction dredger 1.

In this embodiment, a pipeline filter 5 is installed on the sludge discharge pipeline 2 between the cutter suction dredger 1 and the relay cutter suction dredger 3 (when there are multiple relay cutter suction dredgers 3, the pipeline filter 5 is also installed on the sludge discharge pipeline 2 between adjacent relay cutter suction dredgers 3), and the pipeline filter 5 is used for filtering dredged slurry, so as to avoid the problems of pipe blockage and pump blockage caused by backward circulation of contained large-particle-size stones. The sludge discharge pipeline 2 is usually a water self-floating pipeline, which is formed by splicing a pipeline with a floating body and a common pipeline, floats on the water surface, and the pipeline filter 5 is connected in series between the pipeline with the floating body and the common pipeline.

In particular, the pipeline filter 5 comprises a filter housing with openable cleaning holes, inside which a cone arresting net is mounted, the tips of which face in the opposite direction to the conveying direction of the slurry. In the process of conveying the dredging slurry along the sludge discharge pipeline 2, when the dredging slurry passes through the pipeline filter 5, large-particle-size stones in the dredging slurry are blocked and trapped by the cone blocking net, and constructors periodically open cleaning holes in the filter shell to scoop out the stones trapped and accumulated in the pipeline.

Referring to fig. 3, it can be seen that:

The relay cutter suction dredger 3 is formed by reforming a cutter suction dredger, the cutter suction dredger is temporarily lost in the stage of being used as the relay dredger, and the relay cutter suction dredger 3 can be restored to the original cutter suction dredger when necessary, so that the construction capacity of the cutter suction dredger is restored.

The relay cutter suction ship 3 comprises a relay ship body 3-1 from which a reamer bridge is removed, a buoyancy sand hopper 3-2 with an open top is arranged in a groove in which an original reamer bridge is positioned, a main body part of the buoyancy sand hopper 3-2 is positioned in the groove, and two sides of the buoyancy sand hopper are fixedly connected with the relay ship body 3-1 at two sides of the groove by adopting a supporting structure. The buoyancy sand hopper 3-2 has two functions: one is to provide a certain buoyancy for the relay winch and sucker 3, the other is to temporarily store the dredging mud, the dredging mud obtained by other construction equipment can be injected into the buoyancy sand hopper 3-2, and the dredging mud in the hopper is discharged after the relay winch and sucker 3 is on the shore or is on the barge. The buoyancy hopper 3-2 has a tapered bottom such that the interior dredging mud gradually converges toward the bottom as it is drawn outwardly.

In the embodiment, windlass 3-3 for traction positioning of the relay winch-suction ship 3 are arranged on both sides of the bow and both sides of the stern of the relay ship body 3-1, each windlass 3-3 is used for winding and unwinding an anchor cable, anchors are connected to the end portions of the anchor cables, anchor boat and the like are adopted for casting during construction, then the corresponding anchor cables are wound and unwound by controlling each windlass 3-3, the relay winch-suction ship 3 can be shifted, the specific position of the relay winch-suction ship 3 is anchored by effectively tensioning each anchor cable after the cable is shifted in place, and the specific position is not shifted randomly during dredging construction.

A first slurry pump 3-4 and a second slurry pump 3-5 are installed in the relay ship body 3-1, an input pipeline 3-7 is connected to the inlet of the first slurry pump 3-4, and the input pipeline 3-7 extends to the stern of the relay ship body 3-1 and is in butt joint connection with the sludge discharge pipeline 2. The dredged mud, which is excavated by the cutter suction dredge main vessel 1 and is transported by the dredge line 2, enters the first mud pump 3-4 via the inlet pipe 3-7. A gate valve (such as a hydraulic gate valve) is arranged on the input pipeline 3-7, and the on-off of the input pipeline 3-7 can be controlled by controlling the hydraulic gate valve.

A first extraction pipeline 3-8 is arranged on the relay ship body 3-1, the first extraction pipeline 3-8 is connected to an extraction port on the side part of the buoyancy sand hopper 3-2, a second extraction pipeline 3-10 is connected to an inlet of the second slurry pump 3-5, and the second extraction pipeline 3-10 is connected to an extraction port on the side part of the buoyancy sand hopper 3-2. Gate valves (such as hydraulic gate valves) are arranged on the first extraction pipeline 3-8 and the second extraction pipeline 3-10, and the on-off of the first extraction pipeline 3-8 and the second extraction pipeline 3-10 can be controlled respectively through controlling the hydraulic gate valves. When the gate valve on the first extraction pipeline 3-8 is adjusted to be in an open state, the first slurry pump 3-4 is connected with the buoyancy sand hopper 3-2, the first slurry pump 3-4 can extract the dredging slurry in the buoyancy sand hopper 3-2 at the moment, and similarly, when the gate valve on the second extraction pipeline 3-10 is adjusted to be in an open state, the second slurry pump 3-5 is connected with the buoyancy sand hopper 3-2, and the second slurry pump 3-5 can extract the dredging slurry in the buoyancy sand hopper 3-2 at the moment.

In this embodiment, the inlet of the first slurry pump 3-4 is further connected with a third extraction pipe 3-9, and a gate valve (such as a hydraulic gate valve) is installed on the third extraction pipe 3-9, the third extraction pipe 3-9 is connected to the extraction ports on the side of the buoyancy sand hopper 3-2, the extraction ports connected to the first extraction pipe 3-8 and the third extraction pipe 3-9 are respectively located on two sides of the buoyancy sand hopper 3-2, and when the gate valves on the first extraction pipe 3-8 and the third extraction pipe 3-9 are opened, the first slurry pump 3-4 extracts the slurry from two sides of the buoyancy sand hopper 3-2, so as to improve the efficiency of slurry extraction.

The outlet of the first slurry pump 3-4 is connected to the inlet of the second slurry pump 3-5 through a serial pipeline 3-11, a gate valve (such as a hydraulic gate valve) is arranged on the serial pipeline 3-11, a first discharge pipeline 3-13 is also connected to the outlet of the first slurry pump 3-4, a gate valve (such as a hydraulic gate valve) is arranged on the first discharge pipeline 3-13, and a second discharge pipeline 3-14 is also connected to the outlet of the second slurry pump 3-5.

When the gate valve on the serial pipeline 3-11 is opened, the first slurry pump 3-4 and the second slurry pump 3-5 are in serial connection, and the slurry sent by the first slurry pump 3-4 enters the second slurry pump 3-5 for further pumping, and finally is sent out by the second discharge pipeline 3-14. When the gate valve on the serial pipeline 3-11 is closed and the gate valve on the first discharge pipeline 3-13 is opened, the dredging mud is directly sent out by adopting the first mud pump 3-4.

The first discharge pipe 3-13 and the second discharge pipe 3-14 are connected with one three-way pipe 3-16 arranged at the bow position, specifically, the front end of the first discharge pipe 3-13 is connected to the rear first interface of the three-way pipe 3-16, the front end of the second discharge pipe 3-14 is connected to the rear second interface of the three-way pipe 3-16, and the front end third port of the three-way pipe 3-16 is in butt joint with the sludge discharge pipe 2. The dredged mud pumped and conveyed by the first mud pump 3-4 or the second mud pump 3-5 is finally collected to the three-way pipeline 3-16, which can simplify the connection between the mud pipeline and the mud discharge pipeline 2 on the relay cutter suction dredge 3.

In this embodiment, the utility model also comprises a water pumping pipeline 3-6 with a vacuum release valve, the upper end of the water pumping pipeline 3-6 is connected to the inlet of the first slurry pump 3-4, the other end extends to the bottom of the relay ship body 3-1, the vacuum release valve is opened when the vacuum degree in the pipeline reaches a set value, and the surrounding water enters the pipeline through the water pumping pipeline 3-6.

The vacuum release valve can be a hydraulic gate valve, and the function of setting the vacuum release valve is that: when the first slurry pump 3-4 and/or the second slurry pump 3-5 of the relay cutter-suction dredger 3 are/is operated, the problem that the vacuum degree is increased in the pipeline possibly caused by the fact that the pump process of the cutter-suction dredger 1 on dredged slurry cannot be well matched is solved, equipment and the pipeline can be damaged when the problem is serious, after the vacuum release valve is arranged, when the internal vacuum degree reaches a set value, the valve is opened, under the action of the vacuum environment in the pipeline, water under the ship enters the pipeline through the water suction pipeline 3-6, the problem of vacuum in the pipeline is solved, and the protection effect is achieved on the equipment and the pipeline.

The other function of the water pumping pipeline 3-6 and the vacuum release valve thereof is to flush the pipeline, when a pipeline flushing procedure is required to be executed, the vacuum release valve is controlled to be opened, the first slurry pump 3-4 and the second slurry pump 3-5 normally provide pumping action for slurry, at the moment, water entering the pipeline flows along the pipeline and is conveyed through the slurry discharging pipeline 2, flushing action is generated on the whole equipment and pipeline, and the flushing procedure is executed regularly to help remove the settled slurry in the equipment and the pipeline, so that the smoothness of the equipment and the pipeline is improved.

In this embodiment, the inlet pipeline of the first slurry pump 3-4 is further provided with a pre-pump pressure sensor 3-12 for detecting the pressure inside the pipeline, and the pre-pump pressure sensor 3-12 is arranged to monitor the pressure inside the inlet pipeline, so as to find the problem of the vacuum degree inside the pipeline in time, and operate the vacuum release valve when necessary.

In this embodiment, the first exhaust pipe 3-13 and/or the second exhaust pipe 3-14 and/or the three-way pipe 3-16 are/is provided with a pressure relief exhaust valve 3-15, and when the internal pressure of the pipe reaches a set value, the pressure relief exhaust valve 3-15 opens for pressure relief. In general, the dredging slurry in the pipeline and the mud discharging pipeline 2 is conveyed and moved along the middle lower part of the pipeline and the pipeline, air is arranged above the dredging slurry, the pipeline and the pipeline are damaged when the internal pressure is increased to a certain degree, and the pressure in the pipeline and the pipeline can be timely reduced by safely discharging the gas through the pressure relief exhaust valve 3-15, so that the operation safety of a system is improved.

The operation mode is as follows:

the cutter suction dredger 1 and the relay cutter suction dredger 3 are moved into position, wherein the cutter suction dredger 1 is moved to a dredging construction water area and dredging construction is carried out according to the prior art, the relay cutter suction 3 is positioned between the dredging construction water area and the mud receiving area 4, and the relay cutter suction 3 is anchored at a position by anchoring and operating each winch 3-3; a sludge discharge pipeline 2 with a pipeline filter 5 is connected between the cutter suction dredger 1 and the relay cutter suction dredger 3, and the sludge discharge pipeline 2 is connected between the relay cutter suction dredger 3 and the sludge receiving area 4;

When the cutter-suction dredger series construction process is executed, the gate valves on the input pipeline 3-7 and the series pipeline 3-11 are operated to be opened, the gate valves at the other positions are closed, the cutter-suction dredger 1 carries out dredging construction to generate dredging slurry, the dredging slurry is conveyed to the relay cutter-suction dredger 3 through the mud discharge pipeline 2, the dredging slurry sequentially passes through the input pipeline 3-7, the first mud pump 3-4, the series pipeline 3-11, the second mud pump 3-5, the second discharge pipeline 3-14 and the three-way pipeline 3-16, and then reaches the mud receiving area 4 through the mud discharge pipeline 2, and the relay cutter-suction dredger 3 plays a role in expanding the dredging slurry blowing distance and realizes the large cutter-suction dredger series dredging construction process under the long-blowing distance working condition. The cutter suction dredger 1 is provided with an underwater slurry pump and two in-cabin slurry pumps, and the relay cutter suction ship 3 is provided with two slurry pumps, so that the cutter suction ship serial dredging construction system is a five-pump serial dredging construction system.

Claims (7)

1. A large-scale cutter suction dredger series connection construction system under long blowing distance working condition is characterized in that: the device comprises a cutter suction dredger (1) and at least one relay cutter suction dredger (3) positioned behind the cutter suction dredger, wherein the cutter suction dredger (1) and the relay cutter suction dredger (3) are connected by adopting a sludge discharge pipeline (2), and the last relay cutter suction dredger (3) is connected to a sludge receiving area (4) through the sludge discharge pipeline (2);

The relay cutter suction dredger (3) is formed by reforming a cutter suction dredger and comprises a relay ship body (3-1) from which a reamer bridge is removed, a buoyancy sand hopper (3-2) with an open top is arranged in a groove where the original reamer bridge is arranged, a first slurry pump (3-4) and a second slurry pump (3-5) are arranged in the relay ship body (3-1), an inlet pipeline (3-7) and a first extraction pipeline (3-8) are connected to the inlet of the first slurry pump (3-4), the inlet pipeline (3-7) extends to the stern of the relay ship body (3-1) and is in butt joint with a mud discharge pipeline (2), the first extraction pipeline (3-8) is connected to an extraction port at the side part of the buoyancy sand hopper (3-2), a second extraction pipeline (3-10) is connected to an extraction port at the side part of the buoyancy sand hopper (3-2), an outlet of the first slurry pump (3-4) is connected to an extraction port at the side part of the second slurry sand hopper (3-5) through a pipeline (3-11), an outlet of the first slurry pump (3-4) is connected to an outlet port of the second slurry pump (3-4) in series, and a slurry outlet port (13) is also connected to the second pump (3-4) through a pipeline (3-4), the first discharge pipeline (3-13) and the second discharge pipeline (3-14) are connected with a three-way pipeline (3-16) arranged at the bow position, and a third port of the three-way pipeline (3-16) is in butt joint connection with the sludge discharge pipeline (2); gate valves are arranged on the input pipeline (3-7), the first extraction pipeline (3-8), the second extraction pipeline (3-10), the serial pipeline (3-11) and the first discharge pipeline (3-13).

2. The large cutter suction dredger series connection construction system under the working condition of long blowing distance as claimed in claim 1, wherein the construction system is characterized in that: the inlet of the first slurry pump (3-4) is also connected with a third extraction pipeline (3-9), a gate valve is arranged on the third extraction pipeline (3-9), the third extraction pipeline (3-9) is connected to the extraction ports at the side part of the buoyancy sand hopper (3-2), and the extraction ports connected with the first extraction pipeline (3-8) and the third extraction pipeline (3-9) are respectively positioned at two sides of the buoyancy sand hopper (3-2).

3. The large cutter suction dredger series connection construction system under the working condition of long blowing distance as claimed in claim 2, wherein the construction system is characterized in that: the novel water pump is characterized by further comprising a water pumping pipeline (3-6) with a vacuum release valve, wherein the upper end of the water pumping pipeline (3-6) is connected to the inlet of the first slurry pump (3-4), the other end of the water pumping pipeline extends to the bottom of the relay ship body (3-1), the vacuum release valve is opened when the vacuum degree in the pipeline reaches a set value, and surrounding water enters the pipeline through the water pumping pipeline (3-6).

4. The large cutter suction dredger series connection construction system under the working condition of long blowing distance as claimed in claim 3, wherein the construction system is characterized in that: a pre-pump pressure sensor (3-12) for detecting the pressure inside the pipeline is also arranged on the inlet pipeline of the first slurry pump (3-4).

5. The large-scale cutter-suction dredger series connection construction system under the working condition of long blowing distance as claimed in claim 4, wherein the construction system is characterized in that: the first discharge pipeline (3-13) and/or the second discharge pipeline (3-14) and/or the three-way pipeline (3-16) are/is provided with a pressure relief exhaust valve (3-15), and the pressure relief exhaust valve (3-15) is opened for pressure relief when the internal pressure of the pipeline reaches a set value.

6. The large-scale cutter-suction dredger series connection construction system under the working condition of long blowing distance as claimed in claim 5, wherein the construction system is characterized in that: windlass (3-3) for traction positioning of the relay suction dredger (3) is arranged on both sides of the bow and both sides of the stern of the relay ship body (3-1).

7. The large-scale cutter-suction dredger series connection construction system under the working condition of long blowing distance as claimed in claim 6, wherein the construction system is characterized in that: the mud discharging pipelines (2) between the cutter suction dredger (1) and the relay cutter suction dredger (3) and the mud discharging pipelines (2) between the adjacent relay cutter suction dredgers (3) are respectively provided with a pipeline filter (5), the pipeline filter (5) comprises a filter shell with openable cleaning holes, a cone blocking net is arranged in the filter shell, and the tip of the cone blocking net faces to the direction opposite to the conveying direction of mud.