Offshore construction desilting and dredging device and desilting and dredging method

Abstract

The offshore construction desilting and dredging device comprises a to-be-constructed area and a dredger, the to-be-constructed area is provided with a plurality of cleaning areas, the cleaning areas are excavated from shallow to deep in a stepped mode, and floating marks are arranged on the surface of the to-be-constructed area and correspond to the cleaning areas; the dredger comprises a grab dredger and a trailing suction dredger, and a satellite positioning system is arranged in the dredger; a mud barge is arranged on one side of the grab dredger, and a plurality of connecting mechanisms are arranged on the side, close to the mud barge, of the grab dredger. The drag suction dredger is provided with a digging depth indicator; by dividing the cleaning area and conducting stepped dredging on the cleaning area, the cleaning area can be conveniently observed, more accurate construction is conducted through a satellite navigation system, and the situation of missing excavation or excessive excavation is avoided.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to an offshore construction dredging device and a dredging method. Background Art

[0002] Dredging work is required in the waterways in the sea to prevent the silt in the waterways from forming shallow spots and affecting the passage of ships. The usual dredging work is to use dredgers to directly dig and transport the excavated silt to the dumping point, thereby reducing the silt accumulation in the waterway.

[0003] With respect to the above-mentioned related technologies, the inventors believe that direct excavation is prone to excessive excavation, causing environmental problems, or may result in missed excavation, causing the missed excavated mud and sand to form shallow points, which still affects the passage of ships. Summary of the invention

[0004] The first purpose of the present application is to provide an offshore construction dredging device to improve the problem of over-digging or missed digging that may occur during dredging.

[0005] The present application provides an offshore construction dredging device and a dredging method using the following technical solutions: A dredging device for offshore construction comprises an area to be constructed and a dredger, wherein the area to be constructed is provided with a plurality of cleaning areas, and the plurality of cleaning areas are excavated in a stepped manner from shallow to deep, and floating marks are provided on the surface of the area to be constructed corresponding to the cleaning areas; the dredger comprises a grab dredger and a trailing suction dredger, and the dredger is provided with a satellite positioning system; a mud barge is provided on one side of the grab dredger, and a plurality of connecting mechanisms are provided on the side of the grab dredger close to the mud barge; the trailing suction dredger is provided with a digging depth indicator; and a protective mechanism is provided on the side of the area to be constructed close to the shallow water area.

[0006] By adopting the above technical scheme, the area to be constructed is divided into several cleaning areas, and floating markers are placed between adjacent cleaning areas. The cleaning areas can be visually observed by observing the floating markers; dredging work is carried out using dredgers, which are equipped with satellite positioning systems. The area to be constructed can be made into an electronic nautical chart, which can provide the dredger's own positioning information and multiple information such as the excavation position, the mud dumping area position, the channel and navigation marks, and the channel conditions of surrounding waters, thereby making dredging more convenient, and the excavation more accurate and efficient; by dividing the cleaning areas into several areas, the cleaning areas are excavated in a stepped manner from shallow to deep. The stepped shape makes it easier to observe the cleaning areas and is not easy to form ridges. The satellite navigation system is used to assist in avoiding missed excavation. At the same time, the electronic nautical chart can be observed to avoid excessive excavation that affects the environment.

[0007] Dredgers include grab dredgers and trailing suction dredgers. The grab dredger is responsible for the main dredging work. The grab dredger is docked between the cleaning areas. At the same time, a mud barge is set on one side of the grab dredger. The grab dredger will place the excavated mud and sand in the mud barge, and then transport the mud and sand to the mud dumping area through the mud barge; and a connecting mechanism is set on the side of the grab dredger close to the mud barge. The connecting mechanism can be used to conveniently connect the mud barge and the grab dredger, so that the docking of the mud barge is more stable, which is convenient for the grab dredger to grab the mud and sand into the mud barge; the trailing suction dredger can suck the mud and sand into the mud barge. The silt is collected into the mud chamber of the trailing suction hopper dredger, and then the absorbed silt is transported to the mud dumping area. The trailing suction hopper dredger can also absorb the silt raised by the grab dredger during operation to avoid pollution to the environment in the water area. At the same time, a dredging depth indicator is provided in the trailing suction hopper dredger, by which the dredging depth can be controlled to avoid excessive dredging. Through the cooperation of the grab dredger and the trailing suction hopper dredger, the efficiency of dredging is improved and the impact on the environment is reduced. At the same time, a protective mechanism is installed on the side of the construction area close to the shallow water area to reduce the impact of dredging on the surrounding environment.

[0008] Preferably, the connecting mechanism includes a fixed platform and a connecting frame, the connecting frame is rotatably connected to the fixed platform, a driving member is provided on the fixed platform, and the driving member is connected to the connecting frame; a connecting groove is provided on the side of the mud barge close to the dredger, and the connecting groove can be used for the connecting frame to be inserted.

[0009] By adopting the above technical scheme, the connecting mechanism controls the fixed platform and the connecting frame, the connecting frame is rotatably connected to the fixed platform, and a driving member is installed on the fixed platform, the driving member is connected to the connecting frame, and the connecting frame can be driven to rotate by the driving member; at the same time, a connecting groove is provided on the side of the mud barge close to the dredger, and the connecting frame can be rotatably inserted into the connecting groove, so that the mud barge and the grab dredger are stably connected together, which is convenient for the transportation of mud and sand.

[0010] Preferably, a magnetic component 1 is provided at one end of the connecting frame close to the mud barge, a fixing groove is provided in the connecting groove, and a magnetic component 2 magnetically attracted to the magnetic component 1 is provided in the fixing groove.

[0011] By adopting the above technical solution, a magnetic component 1 is provided at one end of the connecting frame, a fixing groove is provided in the connecting groove, and a magnetic component 2 is installed in the fixing groove. The magnetic attraction between the magnetic component 1 and the magnetic component 2 is utilized to make the connecting frame more firmly fixed in the connecting groove, thereby making the connection between the mud barge and the grab dredger more stable.

[0012] Preferably, the grab dredger is provided with a plurality of positioning anchors in the circumference.

[0013] By adopting the above technical solution, a plurality of positioning anchors are arranged around the grab dredger. The positioning anchors can be used to make the grab dredger more stably fixed, thereby making the dredging work more precise.

[0014] Preferably, the trailing suction dredger is provided with a sand-trapping net.

[0015] By adopting the above technical solution, a sand-trapping net is installed on the trailing suction hopper dredger, and the sand-trapping net can be used to intercept more raised sand, so that the trailing suction hopper dredger can absorb more sand, improve the absorption efficiency of the trailing suction hopper dredger, and further reduce the impact of the construction process on the environment.

[0016] Preferably, the protection mechanism includes an anti-fouling curtain, a curtain pendant installed at the bottom of the anti-fouling curtain, and a float installed on the side of the anti-fouling curtain close to the water surface, and a plurality of fixed anchors are arranged on the float.

[0017] By adopting the above technical scheme, the protective mechanism includes an anti-pollution curtain, a curtain pendant, and a float. The anti-pollution curtain sinks into the mud and sand through the curtain pendant. At the same time, a float is arranged on the side of the anti-pollution curtain close to the water surface. The float is used to stand the anti-pollution curtain in the water, and a plurality of fixed anchors are arranged on the float. The float is stabilized on the water surface by the fixed anchors. At this time, the anti-pollution curtain can separate the area to be constructed from the outside, thereby avoiding dredging and affecting the surrounding environment.

[0018] Preferably, a mounting chamfer is provided on a side of the curtain sinker away from the float.

[0019] By adopting the above technical solution, an installation chamfer is provided on one side of the curtain pendant, and the installation chamfer is utilized to enable the curtain pendant to penetrate into the mud and sand more easily, thereby facilitating the installation of the protective mechanism and improving the installation efficiency of the protective mechanism.

[0020] The second object of the present application is to provide an offshore construction dredging device to improve the problem of over-digging or missed digging that may occur during dredging.

[0021] A dredging method for dredging equipment for offshore construction: Preferably, S100, after determining the area to be constructed, the area to be constructed is divided into a plurality of cleaning areas from shallow to deep; S200, a plurality of floating markers are arranged at the boundary between each two cleaning areas, and the dredger is docked with reference to the floating markers; S300, using a dredger to perform dredging work along the cleaning area, the dredger includes a grab dredger and a trailing suction hopper dredger, the grab dredger is provided with a plurality of positioning anchors in the circumference, and the mud barge is docked at one side of the grab dredger, and a connecting mechanism is provided at the side of the dredger close to the mud barge; a sand blocking net is provided under the trailing suction hopper dredger; S400, the dredger is equipped with a satellite positioning system. The dredger will start digging from the shallow water area and dig the construction area into a step-like shape along the divided cleaning area. The grab dredger needs to place the excavated mud in the mud barge, which will then be transported to the mud dumping area. The trailing suction dredger is equipped with a depth indicator, which will suck the mud into the mud tank inside the ship and then transport it to the mud dumping area. S500, a protective mechanism is provided in the shallow water area of ​​the area to be constructed.

[0022] By adopting the above technical scheme, the area to be constructed is divided into several cleaning areas, and several floating marks are used to intuitively display the cleaning areas; a dredger is used for dredging and silt removal work, and a satellite positioning system is provided in the dredger, and the dredging and silt removal work can be accurately carried out by using the satellite positioning system; the dredger includes a grab dredger and a trailing suction hopper dredger, and the dredging and silt removal work is carried out by the cooperation of the grab dredger and the trailing suction hopper dredger, and several cleaning areas are excavated from shallow to deep in a stepped shape, which makes it easier to observe the cleaning area and is not easy to form ridges; a mud barge is provided on one side of the grab dredger, which is used to transport the grabbed mud and sand to the sand throwing area, and a connecting mechanism is provided between the grab dredger and the mud barge to make the connection of the mud barge more stable; the trailing suction hopper dredger can directly suck the mud and sand into the mud chamber, and the trailing suction hopper dredger can transport it to the sand throwing area; at the same time, a protective mechanism is provided in the shallow water area, and the protective mechanism can be used to isolate the area to be constructed from the outside to prevent the construction from affecting the surrounding environment.

[0023] Preferably, S110, when dividing the cleaning area, adjacent cleaning areas need to retain a certain overlap area to ensure that there is an overlapping excavation area; S310, the connection mechanism includes a fixed platform and a connection frame, the connection frame is rotatably connected to the fixed platform, and a driving member is installed on the fixed platform, the driving member is connected to the connection frame, and is used to drive the connection frame to rotate; a connection groove is provided on a side of the mud barge close to the grab dredger, and the connection groove can be used for inserting the connection frame; S410, the dredger uses the satellite positioning system to locate and make an electronic nautical chart of the area to be constructed. The electronic nautical chart includes not only the positioning information of the dredger itself, but also a number of information such as the location of the trench, the most recent depth of the trench, the location of the mud dumping area, the channel and navigation marks, and the channel conditions of the surrounding waters; S420, the grab dredger is controlled by the operator. First, the empty bucket is opened in the air, and then the line is released. The bucket cuts into the mud layer by its own weight, and the cutting depth is strictly controlled. The operator operates the closed mud bucket to lift the mud bucket filled with dredged soil above the water surface, rotates the bucket arm to move the heavy bucket above the mud barge, opens the bucket to unload the mud, and then rotates the bucket arm in the opposite direction to throw the empty bucket into the excavation point; the trailing suction dredger can control the raking depth according to the real-time water level using the digging depth indicator instrument configured on the trailing suction dredger itself; S510, the protection mechanism includes an anti-fouling curtain, a curtain pendant installed at the bottom of the anti-fouling curtain, a float installed at a side of the anti-fouling curtain close to the water surface, and a plurality of fixed anchors are arranged on the float.

[0024] By adopting the above technical scheme, a certain overlap area is set between the cleaning areas to ensure that there will be no leakage of excavation; the connecting mechanism includes a fixed platform and a connecting frame, the connecting frame is rotatably connected to the fixed platform, and a driving member connected to the connecting frame is installed on the fixed platform, and a connecting groove is provided on the mud barge, and the connecting frame can be inserted into the connecting groove, so that the mud barge can be more stably connected to the grab dredger; a satellite navigation system is installed in the dredger, and the satellite navigation system can be used to draw the area to be constructed into an electronic nautical chart, which is convenient for more accurate construction, and can display multiple information including the positioning information of the dredger itself, the position of the trench, the most recent mapping depth of the trench, the position of the mud throwing area, etc., to improve construction efficiency; the grab dredger controls the excavation depth by adjusting the depth position of the mud bucket, and the suction dredger uses the depth indicator to control the lower rake depth to avoid excessive excavation; the protective mechanism includes an anti-fouling curtain, a curtain pendant, and a float, and the anti-fouling curtain is deeply inserted into the mud and sand by the curtain pendant, and the anti-fouling curtain is placed in the water by the float, so as to isolate the area to be constructed from the outside to avoid affecting the surrounding environment.

[0025] Preferably, S311, a magnetic member 1 is provided on a side of the connecting frame close to the mud barge, a fixing groove is provided in the connecting groove, and a magnetic member 2 magnetically attracted to the magnetic member 1 is provided in the fixing groove; S511, a mounting chamfer is provided on a side of the curtain weight away from the float.

[0026] By adopting the above technical solution, a magnetic piece 1 is provided at one end of the connecting frame, and a fixing groove is provided in the connecting groove, and a magnetic piece 2 is installed in the fixing groove. The connecting frame is more firmly connected to the connecting groove through the magnetic attraction between the magnetic piece 1 and the magnetic piece 2, so that the mud barge is fixed more stably; an installation chamfer is provided on one side of the curtain pendant, and the installation chamfer can make the curtain pendant more easily penetrate into the mud and sand, thereby improving the installation efficiency.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The construction area is divided into several clearing areas, and the clearing areas are excavated from shallow to deep into a stepped shape using a dredger. The stepped shape makes it easier to observe the clearing area and is less likely to form ridges. At the same time, a satellite navigation system is installed in the dredger, which can be used for more accurate construction and avoid omissions or over-excavation. 2. A connection mechanism is provided between the grab dredger and the mud barge, and the connection mechanism includes a fixed platform and a connection frame. The connection frame is rotatably connected to the fixed platform, and the connection frame is driven to rotate by a driving member. A connection groove is provided on the side of the mud barge close to the grab dredger, and the mud barge is more stably fixed by inserting the connection frame into the connection groove, so as to facilitate the transportation of mud and sand. 3. A protective mechanism is set up on the side of the construction area close to the shallow water area. The protective mechanism includes an anti-fouling curtain, a curtain pendant, and a float. The curtain pendant is used to push the anti-fouling curtain deep into the mud and sand. At the same time, a float is set on the side of the anti-fouling curtain close to the water surface so that the anti-fouling curtain can stand in the water, isolating the construction area from the outside to prevent the construction from affecting the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The invention relates to an overall structure of an offshore construction dredging device.

[0029] Figure 2 yes Figure 1 Enlarged view of part A in .

[0030] Figure 3 yes Figure 1 Enlarged view of part B in .

[0031] Figure 4 yes Figure 3 Enlarged view of part C in .

[0032] In the figure, 1, area to be constructed; 11, cleaning area; 2, dredger; 21, grab dredger; 211, mud barge; 2111, connecting groove; 2112, fixing groove; 21121, magnetic part 2; 212, positioning anchor; 22, suction dredger; 221, sand-trapping net; 3, floating mark; 4, connecting mechanism; 41, fixing platform; 411, driving part; 42, connecting frame; 421, magnetic part 1; 5, protective mechanism; 51, anti-fouling curtain; 52, curtain pendant; 521, installation chamfer; 53, float; 531, fixed anchor. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1 -Attached Figure 4 , further details of this application are given.

[0034] Embodiment 1: A dredging device for offshore construction, referring to Figure 1, including a construction area 1 and a dredger 2. The construction area 1 is divided into several clean areas, and the clean areas are excavated in a stepped manner from shallow to deep. The stepped shape makes it easier to observe the clean area 11 and is not easy to form ridges. The dredging work is mainly carried out by the dredger 2. The dredger 2 is equipped with a satellite positioning system, and the construction area 1 can be made into an electronic nautical chart. The electronic nautical chart contains a plurality of information including the positioning information of the dredger 2 itself, the trench position, the most recent mapping depth of the trench, the position of the mud dumping area, the channel and navigation marks, the channel conditions of the surrounding waters, etc. The satellite positioning system can be used to more accurately carry out the dredging work, avoid missed excavation or excessive excavation, improve work efficiency, and shorten the construction period.

[0035] Reference Figure 1 The dredger 2 includes a grab dredger 21 and a trailing suction dredger 22. The grab dredger 21 is responsible for the main work of dredging mud and sand. A mud barge 211 is arranged on one side of the grab dredger 21. The grab dredger 21 will place the excavated mud and sand in the mud barge 211, and then transport the mud and sand to the mud dumping area through the mud barge 211. The mud dumping area is transported to avoid affecting the environment; and a connecting mechanism 4 is arranged on the side of the grab dredger 21 close to the mud barge 211. The connecting mechanism 4 can be used to connect the mud barge 211 to the grab dredger 21 more stably, so that the docking of the mud barge 211 is more stable; at the same time, a plurality of positioning anchors 212 are arranged around the grab dredger 21. The positioning anchor 2 12 makes the fixation of the grab dredger 21 more stable, thereby making the dredging work more accurate; the trailing suction hopper dredger 22 directly absorbs the silt into the mud chamber, and then transports it to the mud dumping area by the trailing suction hopper dredger 22; the trailing suction hopper dredger 22 can also absorb the silt raised by the grab dredger 21 during the work process, so as to avoid pollution in the construction area 1; and a sand-blocking net 221 is arranged on the trailing suction hopper dredger 22, and the sand-blocking net 221 can be used to block more raised silt, thereby improving the absorption efficiency of the trailing suction hopper dredger 22 and further reducing the impact of the construction process on the environment; at the same time, a dredging depth indicator is arranged in the trailing suction hopper dredger 22, and the dredging depth can be controlled by the dredging depth indicator to avoid excessive dredging.

[0036] Reference Figure 3 and Figure 4The connecting mechanism 4 includes a fixed platform 41 and a connecting frame 42. The connecting frame 42 is rotatably connected to the fixed platform 41, and a driving member 411 is installed on the fixed platform 41. The driving member 411 is a motor. The driving member 411 is connected to the connecting frame 42 to drive the connecting frame 42 to rotate; at the same time, a connecting groove 2111 is provided on the side of the mud barge 211 close to the grab dredger 21, and the connecting groove 2111 can be inserted into the connecting frame 42, so that the mud barge 211 and the grab dredger 21 are stably connected. Together, it is convenient to carry out the mud and sand transportation work; and a magnetic part 421 is arranged at one end of the connecting frame 42 close to the mud barge 211, and the magnetic part 421 is a magnet. At the same time, a fixing groove 2112 is arranged in the connecting groove 2111, and a magnetic part 2 21121 is installed in the fixing groove 2112, and the magnetic part 2 21121 is a magnet. The magnetic part 421 and the magnetic part 2 21121 can be magnetically attracted to each other, so that the mud barge 211 and the grab dredger 21 are more firmly connected together.

[0037] Reference Figure 1 and Figure 2 A protective mechanism 5 is provided on the side of the construction area 1 close to the shallow water area. The protective mechanism 5 includes an anti-fouling curtain 51, a curtain pendant 52 installed at the bottom of the anti-fouling curtain 51, and a float 53 installed on the side of the anti-fouling curtain 51 close to the water surface. The anti-fouling curtain 51 penetrates into the mud and sand through the curtain pendant 52. At the same time, the float 53 drives the anti-fouling curtain 51 to stand in the water, and a plurality of fixed anchors 531 are provided on the float 53. The fixed anchors 531 are used to stabilize the float 53 at a preset position. At this time, the anti-fouling curtain 51 can isolate the construction area 1 from the outside, thereby preventing the dredging process from affecting the surrounding environment; at the same time, an installation chamfer 521 is provided on the side of the curtain pendant 52 away from the float 53. The installation chamfer 521 can make the curtain pendant 52 more easily penetrate into the mud and sand, thereby improving the installation efficiency.

[0038] The implementation principle of the embodiment of the present application is: The area to be constructed 1 is divided into a plurality of cleaning areas 11, and a dredger 2 is used to dredge the cleaning areas 11 from shallow to deep into a stepped shape. The stepped shape makes it easier to observe the cleaning areas 11 and is not prone to forming ridges. A satellite navigation system is provided on the dredger 2 to assist in avoiding missed or excessive excavation.

[0039] The dredger 2 includes a grab dredger 21 and a trailing suction hopper dredger 22. The grab dredger 21 is mainly responsible for digging out mud and sand, and a mud barge 211 is connected to one side of the grab dredger 21 through a connecting mechanism 4. The mud barge 211 can be used to transport the mud and sand dug out by the grab dredger 21 to the mud dumping area; the trailing suction hopper dredger 22 can suck out the mud and sand, and at the same time absorb the raised mud and sand together, and then transport it to the mud dumping area by the trailing suction hopper dredger 22; transporting the mud and sand to the mud dumping area prevents the accumulated mud and sand from affecting the environment.

[0040] A protection mechanism 5 is provided on one side of the area to be constructed 1 close to the shallow water area, and the protection mechanism 5 can isolate the area to be constructed 1 from the external environment, thereby preventing the dredging work in the area to be constructed 1 from affecting the surrounding environment.

[0041] Embodiment 2: A dredging device and dredging method for offshore construction: S100, after determining the area 1 to be constructed, the area 1 to be constructed is divided into a plurality of cleaning areas 11 from shallow to deep; S110, when dividing the cleaning area 11, adjacent cleaning areas 11 need to retain a certain overlap area to ensure that there is an overlapping excavation area; S200, a plurality of floating marks 3 are arranged at the boundary between every two cleaning areas 11, and the dredger 2 is docked with reference to the floating marks 3; S300, using a dredger 2 to perform dredging work along the cleaning area 11, the dredger 2 includes a grab dredger 21 and a trailing suction dredger 22, the grab dredger 212 is provided with a plurality of positioning anchors 212 in the circumference, and a mud barge 211 is docked at one side of the grab dredger 21, and a connecting mechanism 4 is provided at the side of the dredger 2 close to the mud barge 211; a sand-trapping net 221 is provided under the trailing suction dredger 22; S310, the connection mechanism 4 includes a fixed platform 41 and a connection frame 42, the connection frame 42 is rotatably connected to the fixed platform 41, and a driving member 411 is installed on the fixed platform 41, the driving member 411 is connected to the connection frame 42, and is used to drive the connection frame 42 to rotate; a connection groove 2111 is provided on one side of the mud barge 211 close to the grab dredger 21, and the connection groove 2111 can be inserted into the connection frame 42; S311, a magnetic member 1 421 is provided on one side of the connecting frame 42 close to the mud barge 211, a fixing groove 2112 is provided in the connecting groove 2111, and a magnetic member 2 21121 magnetically attracted to the magnetic member 1 421 is provided in the fixing groove 2112; S400, the dredger 2 is provided with a satellite positioning system, and the dredger 2 first dredges from the shallow water area, and dredges the construction area 1 into a stepped shape along the divided cleaning area 11; the grab dredger 21 needs to place the excavated mud and sand in the mud barge 211, and then the mud barge 211 transports it to the mud dumping area; the trailing suction dredger 22 is provided with a digging depth indicator, and the trailing suction dredger 22 sucks the mud and sand into the mud tank inside the ship and then transports it to the mud dumping area; S410, the dredger 2 uses the satellite positioning system to locate and make an electronic nautical chart of the area to be constructed 1, which includes not only the positioning information of the dredger 2 itself, but also multiple information such as the location of the trench, the most recent depth of the trench, the location of the mud dumping area, the channel and navigation marks, and the channel conditions of the surrounding waters; S420, the grab dredger 212 is controlled by the operator, who first opens the empty bucket in the air, then releases the line, and cuts into the mud layer by relying on the weight of the bucket, strictly controlling the cutting depth. The operator operates the closed mud bucket to lift the mud bucket filled with dredged soil above the water surface, rotates the bucket arm to move the heavy bucket above the mud barge 211, opens the bucket to unload the mud, and then rotates the bucket arm in the opposite direction to throw the empty bucket into the excavation point; the trailing suction dredger 22 can control the raking depth according to the real-time water level using the digging depth indicator configured on the trailing suction dredger 22 itself; S500, a protection mechanism 5 is provided in a shallow water area of ​​the area to be constructed 1; S510, the protection mechanism 5 includes an anti-fouling curtain 51, a curtain pendant 52 installed at the bottom of the anti-fouling curtain 51, a float 53 installed on the side of the anti-fouling curtain 51 close to the water surface, and a plurality of fixed anchors 531 are arranged on the float 53; S511, a mounting chamfer 521 is provided on a side of the curtain weight 52 away from the float 53.

[0042] The implementation principle of the embodiment of the present application is: The construction area 1 is divided into a plurality of cleaning areas 11, and the cleaning area 11 is excavated from shallow to deep into a stepped shape by a dredger 2. The stepped shape makes it easier to observe the cleaning area 11 and does not easily form ridges. The dredger 2 is provided with a satellite navigation system, which is used for assistance to avoid missed excavation or excessive excavation. The dredger 2 includes a grab dredger 21 and a trailing suction dredger 22. The grab dredger 21 is mainly responsible for digging out the silt, and the trailing suction dredger 22 can suck out the silt and absorb the raised silt at the same time. The silt dug out by the dredger 2 needs to be transported to the mud dumping area to prevent the silt from affecting the environment. At the same time, a protective mechanism 5 is provided on the side of the construction area 1 close to the shallow water area, and the protective mechanism 5 is used to prevent the dredging in the construction area 1 from affecting the external environment.

[0043] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dredging device for offshore construction, characterized in that: The invention comprises a construction area (1) and a dredger (2), wherein the construction area (1) is provided with a plurality of cleaning areas (11), wherein the plurality of cleaning areas (11) are excavated in a step-like manner from shallow to deep, and a floating mark (3) is provided on the surface of the construction area (1) corresponding to the cleaning areas (11); the dredger (2) comprises a grab dredger (21) (2) and a trailing suction dredger (22) (2), and the dredger (2) is provided with a satellite positioning system; a mud barge (211) is provided on one side of the grab dredger (21), and a plurality of connecting mechanisms (4) are provided on a side of the grab dredger (21) close to the mud barge (211); the trailing suction dredger (22) is provided with a digging depth indicator; and a protective mechanism (5) is provided on a side of the construction area (1) close to the shallow water area.

2. The offshore construction dredging device according to claim 1, characterized in that: The connection mechanism (4) comprises a fixed platform (41) and a connection frame (42), wherein the connection frame (42) is rotatably connected to the fixed platform (41), and a driving member (411) is provided on the fixed platform (41), and the driving member (411) is connected to the connection frame (42); a connection groove (2111) is provided on a side of the mud barge (211) close to the dredging vessel (2), and the connection groove (2111) can be inserted into the connection frame (42).

3. The offshore construction dredging device according to claim 2, characterized in that: A magnetic component 1 (421) is arranged at one end of the connecting frame (42) close to the mud barge (211), a fixing groove (2112) is arranged in the connecting groove (2111), and a magnetic component 2 (21121) magnetically attracted to the magnetic component 1 (421) is arranged in the fixing groove (2112).

4. The offshore construction dredging device according to claim 1, characterized in that: The grab dredger (21) is provided with a plurality of positioning anchors (212) in the circumferential direction.

5. The offshore construction dredging device according to claim 1, characterized in that: The trailing suction dredger (22) is provided with a sand-trapping net (221).

6. The offshore construction dredging device according to claim 1, characterized in that: The protection mechanism (5) comprises an anti-fouling curtain (51), a curtain pendant (52) installed at the bottom of the anti-fouling curtain (51), and a float (53) installed on the side of the anti-fouling curtain (51) close to the water surface, wherein a plurality of fixed anchors (531) are arranged on the float (53).

7. The offshore construction dredging device according to claim 6, characterized in that: A mounting chamfer (521) is provided on one side of the curtain pendant (52) away from the float (53).

8. A dredging method for offshore construction dredging equipment, characterized in that: S100, after determining the area to be constructed (1), the area to be constructed (1) is divided into a plurality of cleaning areas (11) from shallow to deep; S200, a plurality of floating marks (3) are arranged at the boundary between each two cleaning areas (11), and the dredger (2) is docked with reference to the floating marks (3); S300, using a dredger (2) to perform dredging work along the cleaning area (11), the dredger (2) comprising a grab dredger (21) and a trailing suction dredger (22), the grab dredger (21) being provided with a plurality of positioning anchors (212) in the circumferential direction, while a mud barge (211) is docked at one side of the grab dredger (21), and a connecting mechanism (4) is provided at a side of the dredger (2) close to the mud barge (211); a sand trap (221) is provided under the trailing suction dredger (22); S400, a satellite positioning system is provided on the dredger (2), and the dredger (2) first dredges from the shallow water area, and dredges the area to be constructed (1) into a stepped shape along the divided cleaning area (11); the grab dredger (21) needs to place the dredged mud and sand in a mud barge (211), and then the mud barge (211) transports the dredged mud and sand to the mud dumping area; the trailing suction dredger (22) sucks the mud and sand into the mud tank inside the ship and then transports it to the mud dumping area; S500, a protection mechanism (5) is set up in a shallow water area of ​​the area to be constructed (1).

9. The offshore construction dredging device according to claim 8, characterized in that: S110, when dividing the cleaning area (11), adjacent cleaning areas (11) need to retain a certain overlap area to ensure that there is an overlapping excavation area; S310, the connection mechanism (4) comprises a fixed platform (41) and a connection frame (42), the connection frame (42) is rotatably connected to the fixed platform (41), and a driving member (411) is installed on the fixed platform (41), the driving member (411) is connected to the connection frame (42), and is used to drive the connection frame (42) to rotate; a connection groove (2111) is provided on a side of the mud barge (211) close to the grab dredger (21), and the connection groove (2111) can be inserted into the connection frame (42); S410, the dredger (2) uses a satellite positioning system to locate and prepare an electronic nautical chart of the area to be constructed (1). The electronic nautical chart includes not only the positioning information of the dredger (2) itself, but also a plurality of information such as the location of the trench, the most recent depth of the trench, the location of the mud dumping area, the conditions of the waterway and navigation marks, and the conditions of the waterway in the surrounding waters; S420, the grab bucket dredger (21) is controlled by the operator, firstly, the empty bucket is opened in the air, then the line is released, and the bucket cuts into the mud layer by its own weight, and the cutting depth is strictly controlled. The operator operates the closed mud bucket to lift the mud bucket filled with mud and sand above the water surface, rotates the bucket arm to move the heavy bucket above the mud barge (211), opens the bucket to unload the mud, and then rotates the bucket arm in the opposite direction to throw the empty bucket into the excavation point; the trailing suction dredger (22) can control the raking depth according to the real-time water level using the digging depth indicating instrument equipped on the trailing suction dredger (22); S510, the protection mechanism (5) comprises an anti-fouling curtain (51), a curtain pendant (52) installed at the bottom of the anti-fouling curtain (51), a float (53) installed on the side of the anti-fouling curtain (51) close to the water surface, and a plurality of fixed anchors (531) are arranged on the float (53).

10. The offshore construction dredging device according to claim 9, characterized in that: S311, a magnetic member 1 (421) is arranged on a side of the connecting frame (42) close to the mud barge (211), a fixing groove (2112) is arranged in the connecting groove (2111), and a magnetic member 2 (21121) magnetically attracted to the magnetic member 1 (421) is arranged in the fixing groove (2112); S511, a mounting chamfer (521) is provided on a side of the curtain weight (52) away from the float (53).

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