Dredging construction method of trailing suction hopper vessel

Abstract

The present invention discloses a dredging construction method using a trailing suction hopper vessel, comprising: setting a construction route in a GPS positioning device, and setting the target excavation position coordinates of the trailing suction hopper vessel on the construction route in the GPS positioning device; the trailing suction hopper vessel moves according to the construction route set in the GPS positioning device, and each time it moves a first set distance, the drag head is activated to descend into the mud layer, and the mud concentration at the current depth is detected by a mud concentration sensor. When the mud concentration at the current depth is greater than a set concentration value, the drag head operates at the current depth, extracting and loading mud until the mud concentration at the current depth drops below the set concentration value, and then the drag head is activated to continue descending to the next depth, and the above process is repeated until the drag head reaches the target excavation position coordinates, and until the mud concentration at the depth corresponding to the target excavation position coordinates drops below the set concentration value; and the trailing suction hopper vessel completes the dredging operation. The present invention can improve the efficiency of trailing suction hopper dredging construction.

Description

Technical Field

[0001] The present invention relates to the technical field of port construction, in particular to a dredging construction method of a trailing suction hopper vessel. Background Art

[0002] A trailing suction hopper dredger is a large, self-propelled, bunker-loading dredger equipped with a drag-head excavation machine and a hydraulic mud suction device. During dredging, the drag suction pipe (also known as the drag head) is lowered to the riverbed. The vacuum of the mud pump is used to suck mud from the riverbed into the dredger's mud bunker through the drag head and the mud suction pipe. Once the bunker is full, the dredger is launched to the mud dumping area, where the mud gate is opened to unload the mud, or the excavated mud is directly discharged from the ship. For example, the invention patent with the announcement number CN102261086A relates to a double-hull dragging suction dredger without a mud bunker and its construction method, which uses a drag arm to be lowered to the seabed and sand is extracted and loaded into the bunker during navigation. However, the existing method mainly relies on manual experience to judge the degree and timing of the drag head's descent during the drag suction process. However, the degree of automation of the drag head's descent and the extraction and loading of mud is still insufficient, affecting the efficiency of the drag suction operation. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0004] An object of the present invention is to provide a trailing suction dredging construction method, which can improve the trailing suction dredging construction efficiency.

[0005] In order to achieve these purposes and other advantages according to the present invention, a dredging construction method of a trailing suction hopper vessel is provided, comprising:

[0006] Step 1: Setting a construction route in a GPS positioning device, setting target excavation position coordinates of the trailing hopper ditching vessel on the construction route in the GPS positioning device, wherein the target excavation position coordinates of the trailing hopper ditching vessel on the construction route in the GPS positioning device are determined based on the excavation depth of the trailing hopper ditching vessel along the construction route;

[0007] Step 2, the trailing hopper boat moves according to the construction route set in the GPS positioning device, and divides the construction route into multiple dredging sections of equal length. The length of each dredging section is a first set distance, and the position between two adjacent dredging sections is a point. Every time the trailing hopper boat moves the first set distance, it moves from the previous point to the next point. At the current point, the trailing hopper boat performs dredging and extraction and loading operations. The width of the working surface of the drag head is equal to the first set distance. When the trailing hopper boat stays at the current point, the width of the working surface of the drag head spans the midpoint between the current point and the previous point and the midpoint between the current point and the next point. When the trailing hopper boat works at the current point, the drag head of the trailing hopper boat is started to descend into the mud layer, and the mud concentration at the current depth is detected by the mud concentration sensor. When the mud concentration at the current depth is large At the set concentration value, the drag head operates at the current depth, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud into the tank, until the mud concentration at the current depth drops below the set concentration value, the drag head is started to continue to descend to the next depth, until the mud concentration at the next depth reaches the set concentration value again, the drag head operates at the next depth, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud into the tank, until the mud concentration at the next depth drops below the set concentration value, and the above process is repeated until the drag head reaches the target excavation position coordinates, the drag head is started to operate at the depth corresponding to the target excavation position coordinates, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud into the tank, until the mud concentration at the depth corresponding to the target excavation position coordinates drops below the set concentration value;

[0008] Step 3: The trailing suction hopper vessel completes the dredging operation.

[0009] Preferably, in the dredging construction method of the trailing hopper vessel, in the step three, the trailing hopper vessel completes the dredging operation, including: when the trailing hopper vessel moves along the construction route from the starting point of the construction route to the end point of the construction route, the trailing hopper vessel then returns from the end point of the construction route to the starting point of the construction route, and during the return process, the drag head is lowered to the depth corresponding to the target excavation position coordinates, the mud concentration at the depth corresponding to the target excavation position coordinates is detected by the mud sensor, when the mud sensor detects that the mud concentration at the depth corresponding to the target excavation position coordinates is greater than a set concentration value, the drag head is started to operate at the depth corresponding to the target excavation position coordinates, and the mud conveying system of the trailing hopper vessel is started to extract and load the mud until the mud concentration at the depth corresponding to the target excavation position coordinates drops below the set concentration value.

[0010] Preferably, in the dredging construction method using a trailing hopper barge, in step three, the trailing hopper barge returns from the end point of the construction route to the starting point of the construction route, and during the return process, the drag head is lowered to the depth corresponding to the target digging position coordinates every time it moves a second set distance, and the mud concentration at the depth corresponding to the target digging position coordinates is detected by the mud sensor.

[0011] Preferably, in the trailing suction hopper dredging construction method, the second set distance and the first set distance have different values.

[0012] Preferably, in the trailing suction hopper dredging construction method, the second set distance is greater than the first set distance.

[0013] Preferably, in the dredging construction method with a trailing suction hopper, in the step 2, when the mud concentration at the current depth is greater than the set concentration value, the drag head operates at the current depth, and the mud conveying system of the trailing suction hopper is started to extract and load the mud. The mud conveying system of the trailing suction hopper extracts and loads the mud at a first set speed until the mud concentration at the current depth drops below the set concentration value.

[0014] Preferably, in the dredging construction method of the trailing suction hopper ship, in the step three, when the mud sensor detects that the mud concentration at the depth corresponding to the target excavation position coordinates is greater than the set concentration value, the drag head is started to operate at the depth corresponding to the target excavation position coordinates, and the mud conveying system of the trailing suction hopper ship is started to extract and load the mud. The mud conveying system extracts and loads the mud at a second set speed until the mud concentration at the depth corresponding to the target excavation position coordinates drops below the set concentration value, wherein the second set speed is greater than the first set speed.

[0015] The present invention has at least the following beneficial effects:

[0016] The present invention provides a dredging construction method of a trailing hopper sucker vessel, comprising: step 1, setting a construction route in a GPS positioning device, setting the target excavation position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device, the target excavation position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device being determined according to the excavation depth of the trailing hopper sucker vessel along the construction route; step 2, the trailing hopper sucker vessel moving according to the construction route set in the GPS positioning device, dividing the construction route into a plurality of dredging sections of equal length, the length of each dredging section being a first set distance, the position between two adjacent dredging sections being a point position, the trailing hopper sucker vessel moving from a previous point position to a next point position each time the trailing hopper sucker vessel moves the first set distance, the trailing hopper sucker vessel performs dredging and extraction and loading operations at the current point position, the width of the working surface of the drag head being equal to the first set distance, and when the trailing hopper sucker vessel stays at the current point position, the width of the working surface of the drag head spans the midpoint between the current point position and the previous point position and the midpoint between the current point position and the next point position, the trailing hopper sucker vessel at the current point position When working at the front point, the drag head of the trailing suction hopper vessel is started to descend into the mud layer, and the mud concentration at the current depth is detected by the mud concentration sensor. When the mud concentration at the current depth is greater than the set concentration value, the drag head operates at the current depth, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud until the mud concentration at the current depth drops below the set concentration value. The drag head is started to continue descending to the next depth until the mud concentration at the next depth reaches the set concentration value again. The drag head operates at the next depth, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud until the mud concentration at the next depth drops below the set concentration value. The above process is repeated until the drag head reaches the target digging position coordinates, the drag head is started to operate at the depth corresponding to the target digging position coordinates, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud until the mud concentration at the depth corresponding to the target digging position coordinates drops below the set concentration value. Step three, the trailing suction hopper vessel completes the dredging operation. The present invention marks the coordinates of the target excavation position through a GPS positioning device, and detects the mud concentration at the position of the drag head according to the mud concentration sensor. The drag head descent depth is controlled according to the mud concentration to ensure that the drag head descends to an appropriate depth, and then the mud is extracted, thereby ensuring that the mud concentration in the mud conveying system is relatively stable and improving the efficiency of the drag suction dredging construction.

[0017] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1The present invention is a flowchart of a dredging construction method using a trailing suction hopper vessel according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0020] like Figure 1 As shown, an embodiment of the present invention provides a dredging construction method of a trailing hopper sucker vessel, comprising: step 1, setting a construction route in a GPS positioning device, setting the target excavation position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device, the target excavation position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device being determined according to the excavation depth of the trailing hopper sucker vessel along the construction route; step 2, the trailing hopper sucker vessel moves according to the construction route set in the GPS positioning device, dividing the construction route into a plurality of dredging segments of equal length, the length of each dredging segment being a first set distance, the position between two adjacent dredging segments being a point position, the trailing hopper sucker vessel moves from the previous point position to the next point position each time the trailing hopper sucker vessel moves the first set distance, and at the current point position the trailing hopper sucker vessel performs dredging and extraction and loading operations, the width of the working surface of the drag head being equal to the first set distance, and when the trailing hopper sucker vessel stays at the current point position, the width of the working surface of the drag head spans the midpoint between the current point position and the previous point position and the midpoint between the current point position and the next point position, and the trailing hopper sucker vessel moves at the current point position. When working at the current point, the drag head of the trailing hopper vessel is started to descend into the mud layer, and the mud concentration at the current depth is detected by the mud concentration sensor. When the mud concentration at the current depth is greater than the set concentration value, the drag head operates at the current depth, and the mud conveying system of the trailing hopper vessel is started to extract and load mud until the mud concentration at the current depth drops below the set concentration value. The drag head is started to continue descending to the next depth until the mud concentration at the next depth reaches the set concentration value again. The drag head operates at the next depth, and the mud conveying system of the trailing hopper vessel is started to extract and load mud until the mud concentration at the next depth drops below the set concentration value. The above process is repeated until the drag head reaches the target digging position coordinates, the drag head is started to operate at the depth corresponding to the target digging position coordinates, and the mud conveying system of the trailing hopper vessel is started to extract and load mud until the mud concentration at the depth corresponding to the target digging position coordinates drops below the set concentration value. In step three, the trailing hopper vessel completes the dredging operation.

[0021] The present invention first sets a construction route in a GPS positioning device. The target excavation location coordinates are marked and set based on the excavation depth of the construction route. A trailing suction hopper vessel then moves and excavates according to the settings in the GPS positioning device. Each time the vessel moves a first set distance, the drag head descends, preparing for dredging operations. The drag head's descent depth is determined based on the detection results of a mud concentration sensor. As the drag head descends, if the mud concentration exceeds a set value, indicating that the drag head has reached a suitable dredging depth, the drag head stops descending and dredging continues at the current depth. The mud conveying system is then activated to pump and load mud into the tank until the mud concentration drops below the set value. The drag head then descends again until the mud concentration again reaches above the set value at the next depth. Dredging at the current depth is then stopped, and the mud conveying system is activated to pump and load mud into the tank. This process repeats until the target excavation location coordinates are reached. When the vessel reaches the end of the construction route, the mud stored in the tank is discharged. As the trailing suction hopper barge gradually moves forward, it eventually reaches the end of the construction route and completes the dredging construction.

[0022] In the above-mentioned dredging process, the target excavation position can be the seabed or a certain distance above the seabed, and can be determined according to the actual dredging needs. For example, if the seabed depth is 200 meters and the target excavation depth is 100 meters, then the target excavation position is 100 meters above the seabed. If the seabed depth is 200 meters and the target excavation depth is 200 meters, then the target excavation position is at the seabed. The dredger dredge sails along the construction route. Every time it moves the first set distance, the dredger dredge stops, lowers the drag head to dredge, and starts the conveying system to extract the mud and load it into the cabin. The position where the dredger dredge docks every time it moves the first set distance can also be understood as a point, and the area between two adjacent points is defined as a dredging section. When the dredger docks at point a, the previous point is point b, the next point is point c, the midpoint between point a and point b is d, and the midpoint between point a and point c is e. The drag head has a certain volume, and when digging, it can dig out mud within a certain range. The conveying system has a certain suction force, and it can also extract mud within a certain range when working. When the dredging ship is docked at point a, through the operation of the drag head and the conveying system, it can dig out all the mud from point a to midpoint d, and from point a to midpoint e, and extract it into the cabin. Based on the above process, continuous construction of the entire construction route by the drag suction dredger can be achieved. Preferably, the first set distance is determined by the width of the working surface of the drag head. The width of the working surface of the drag head can be understood as the width of the mud surface that can be excavated when the drag head is dredging.

[0023] In the existing method, the depth to which the drag head descends is set to a fixed value, that is, it descends to a fixed depth each time, and then dredging operations are performed at the fixed depth. However, the mud concentration is inconsistent at different depths, that is, the mud is unevenly distributed throughout the mud layer, resulting in inconsistent mud concentration in the mud conveying system, or even lower than the conveying capacity of the mud conveying system, causing waste in the mud conveying system. Therefore, by detecting the mud concentration, dredging operations and extraction and loading operations are performed only when the drag head descends to a depth with an appropriate concentration, ensuring that the mud concentration of the mud conveying system is relatively stable, thereby improving the utilization efficiency of the mud conveying system and ultimately improving the efficiency of dredging construction. In addition, during the construction process, the drag suction vessel stops driving and performs a drag suction operation at the current position every time it moves the first set distance, which can ensure that dredging construction is carried out on the entire construction route. The present invention can ultimately improve the efficiency of dredging construction.

[0024] In a preferred embodiment, in the dredging construction method described above, in step three, the dredging operation is completed by the dredging vessel, including: when the dredging vessel moves along the construction route from the starting point of the construction route to the end point of the construction route, the dredging vessel returns from the end point of the construction route to the starting point of the construction route, and during the return process, the drag head is lowered to the depth corresponding to the target excavation position coordinates, the mud concentration at the depth corresponding to the target excavation position coordinates is detected by the mud sensor, when the mud sensor detects that the mud concentration at the depth corresponding to the target excavation position coordinates is greater than a set concentration value, the drag head is started to operate at the depth corresponding to the target excavation position coordinates, and the mud conveying system of the dredging vessel is started to extract and load the mud until the mud concentration at the depth corresponding to the target excavation position coordinates drops below the set concentration value.

[0025] After the trailing suction hopper moves from the starting point to the end point, it then returns to the starting point. During the return process, the drag head is lowered to the depth corresponding to the target excavation coordinates. A mud sensor measures the mud concentration at this depth. If the mud depth exceeds the set concentration, indicating that some areas were missed during the previous round of construction, the drag head is used again to dredge, and the mud conveying system is used to extract and load the mud into the tank. This process allows for corrections to be made to areas that did not meet the standards during the previous round of construction, thereby ensuring overall construction quality.

[0026] In a preferred embodiment, in the dredging construction method of the trailing suction hopper barge, in the step three, the trailing suction hopper barge returns from the end point of the construction route to the starting point of the construction route, and during the return process, the drag head is lowered to the depth corresponding to the target digging position coordinates every time it moves a second set distance, and the mud concentration at the depth corresponding to the target digging position coordinates is detected by the mud sensor.

[0027] During the return process, the trailing suction hopper moves according to the second set distance to ensure that the entire construction route is evenly inspected to avoid missing locations, thereby ensuring the overall construction quality.

[0028] In a preferred embodiment, in the trailing suction hopper dredging construction method, the second set distance and the first set distance have different values.

[0029] When the values ​​set for the first set distance and the second set distance are inconsistent, that is, the positions at which the trailing suction hopper vessel is moored in each of the first and second rounds of the construction route can be staggered, thereby ensuring that sufficient dredging construction is carried out on the entire construction route, avoiding omissions, and ensuring construction quality.

[0030] In a preferred embodiment, in the trailing suction hopper dredging construction method, the second set distance is greater than the first set distance.

[0031] During the first round of construction, the trailing suction hopper vessel stopped at various depths each time it moved the first set distance, completing most of the construction progress. Therefore, the second round of construction was a gap-finding and gap-filling operation. Therefore, to improve construction efficiency, the second set distance can be set greater than the first set distance.

[0032] In a preferred embodiment, in the dredging construction method of the trailing suction hopper ship, in the step 2, when the mud concentration at the current depth is greater than the set concentration value, the drag head operates at the current depth, and the mud conveying system of the trailing suction hopper ship is started to extract and load the mud. The mud conveying system of the trailing suction hopper ship extracts and loads the mud at a first set speed until the mud concentration at the current depth drops below the set concentration value.

[0033] In the first round of construction, each time the drag head reaches a certain depth for dredging operations, the mud conveying system will extract and load the slurry at the first set speed to ensure construction efficiency.

[0034] In a preferred embodiment, in the dredging construction method of the trailing suction hopper ship, in the step three, when the mud sensor detects that the mud concentration at the depth corresponding to the target excavation position coordinates is greater than the set concentration value, the drag head is started to operate at the depth corresponding to the target excavation position coordinates, and the mud conveying system of the trailing suction hopper ship is started to extract and load the mud. The mud conveying system extracts and loads the mud at a second set speed until the mud concentration at the depth corresponding to the target excavation position coordinates drops below the set concentration value, wherein the second set speed is greater than the first set speed.

[0035] During the second operation, each time the drag head reaches a certain depth for dredging, the mud conveying system will pump and load the slurry into the hold at the second set speed, which will be lower than the first set speed. Because the amount of slurry to be processed in the second operation is small, a higher suction speed can be used to fully utilize the working capacity of the mud conveying system and improve suction efficiency.

[0036] In summary, the present invention provides a dredging construction method of a trailing hopper sucker vessel, comprising: step 1, setting a construction route in a GPS positioning device, setting the target excavation position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device, the target excavation position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device being determined according to the excavation depth of the trailing hopper sucker vessel along the construction route; step 2, the trailing hopper sucker vessel moves according to the construction route set in the GPS positioning device, dividing the construction route into a plurality of dredging segments of equal length, the length of each dredging segment being a first set distance, the position between two adjacent dredging segments being a point position, the trailing hopper sucker vessel moves from a previous point position to a next point position each time the trailing hopper sucker vessel moves the first set distance, and at the current point position the trailing hopper sucker vessel performs dredging and extraction and loading operations, the width of the working surface of the drag head being equal to the first set distance, and when the trailing hopper sucker vessel stays at the current point position, the width of the working surface of the drag head spans the midpoint between the current point position and the previous point position and the midpoint between the current point position and the next point position, and the trailing hopper sucker vessel moves at the current point position. When working at the current point, the drag head of the trailing hopper vessel is started to descend into the mud layer, and the mud concentration at the current depth is detected by the mud concentration sensor. When the mud concentration at the current depth is greater than the set concentration value, the drag head operates at the current depth, and the mud conveying system of the trailing hopper vessel is started to extract and load mud until the mud concentration at the current depth drops below the set concentration value. The drag head is started to continue descending to the next depth until the mud concentration at the next depth reaches the set concentration value again. The drag head operates at the next depth, and the mud conveying system of the trailing hopper vessel is started to extract and load mud until the mud concentration at the next depth drops below the set concentration value. The above process is repeated until the drag head reaches the target digging position coordinates, the drag head is started to operate at the depth corresponding to the target digging position coordinates, and the mud conveying system of the trailing hopper vessel is started to extract and load mud until the mud concentration at the depth corresponding to the target digging position coordinates drops below the set concentration value. In step three, the trailing hopper vessel completes the dredging operation. The present invention marks the coordinates of the target excavation position through a GPS positioning device, and detects the mud concentration at the position of the drag head according to the mud concentration sensor. The drag head descent depth is controlled according to the mud concentration to ensure that the drag head descends to an appropriate depth, and then the mud is extracted, thereby ensuring that the mud concentration in the mud conveying system is relatively stable and improving the efficiency of the drag suction dredging construction.

[0037] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and exemplary embodiments. They can be applied to a variety of fields suitable for the present invention. Further modifications will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims

1. A dredging construction method using a trailing suction hopper vessel, characterized in that: include: Step 1: Setting a construction route in a GPS positioning device, setting target excavation position coordinates of the trailing hopper ditching vessel on the construction route in the GPS positioning device, wherein the target excavation position coordinates of the trailing hopper ditching vessel on the construction route in the GPS positioning device are determined based on the excavation depth of the trailing hopper ditching vessel along the construction route; Step 2: The trailing hopper sucker vessel moves according to the construction route set in the GPS positioning device, and divides the construction route into multiple dredging sections of equal length. The length of each dredging section is a first set distance, and the position between two adjacent dredging sections is a point. Each time the trailing hopper sucker vessel moves the first set distance, it moves from the previous point to the next point. At the current point, the trailing hopper sucker vessel performs dredging and extraction and loading operations. The width of the working surface of the drag head is equal to the first set distance. When the trailing hopper sucker vessel stays at the current point, the width of the working surface of the drag head spans the midpoint between the current point and the previous point and the midpoint between the current point and the next point. When the trailing hopper sucker vessel works at the current point, the drag head of the trailing hopper sucker vessel is started to descend into the mud layer, and the mud concentration at the current depth is detected by the mud concentration sensor. When the mud concentration at the current depth is greater than A concentration value is set, the drag head operates at the current depth, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud until the mud concentration at the current depth drops below the set concentration value, the drag head is started to continue to descend to the next depth, until the mud concentration at the next depth reaches the set concentration value again, the drag head operates at the next depth, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud until the mud concentration at the next depth drops below the set concentration value, and the above process is repeated until the drag head reaches the target excavation position coordinates, the drag head is started to operate at the depth corresponding to the target excavation position coordinates, and the mud conveying system of the trailing suction hopper vessel is started to extract and load mud until the mud concentration at the depth corresponding to the target excavation position coordinates drops below the set concentration value; Step 3: The trailing suction hopper vessel completes the dredging operation.

2. The dredging construction method of a trailing suction hopper vessel according to claim 1, wherein: In the step three, the trailing hopper dredger completes the dredging operation, including: when the trailing hopper dredger moves along the construction route from the starting point of the construction route to the end point of the construction route, the trailing hopper dredger returns from the end point of the construction route to the starting point of the construction route, and during the return process, the drag head is lowered to the depth corresponding to the target digging position coordinates, the mud concentration at the depth corresponding to the target digging position coordinates is detected by the mud concentration sensor, when the mud concentration sensor detects that the mud concentration at the depth corresponding to the target digging position coordinates is greater than a set concentration value, the drag head is started to operate at the depth corresponding to the target digging position coordinates, and the mud conveying system of the trailing hopper dredger is started to extract and load the mud until the mud concentration at the depth corresponding to the target digging position coordinates drops below the set concentration value.

3. The dredging construction method of a trailing suction hopper vessel according to claim 2, wherein: In step three, the trailing suction hopper vessel returns from the end point of the construction route to the starting point of the construction route, and during the return process, the drag head is lowered to the depth corresponding to the target excavation position coordinates every time it moves a second set distance, and the mud concentration at the depth corresponding to the target excavation position coordinates is detected by the mud concentration sensor.

4. The dredging construction method using a trailing suction hopper vessel according to claim 3, wherein: The second set distance has a different value from the first set distance.

5. The dredging construction method using a trailing suction hopper vessel according to claim 4, wherein: The second set distance is greater than the first set distance.

6. The dredging construction method using a trailing suction hopper vessel according to claim 1, wherein: In the step 2, when the mud concentration at the current depth is greater than the set concentration value, the drag head operates at the current depth, and the mud conveying system of the trailing suction hopper vessel is started to extract and load the mud. The mud conveying system of the trailing suction hopper vessel extracts and loads the mud at a first set speed until the mud concentration at the current depth drops below the set concentration value.

7. The dredging construction method using a trailing suction hopper vessel according to claim 6, wherein: In the step 2, when the mud concentration sensor detects that the mud concentration at the depth corresponding to the target excavation position coordinates is greater than the set concentration value, the drag head is started to operate at the depth corresponding to the target excavation position coordinates, and the mud conveying system of the trailing suction hopper barge is started to extract and load the mud. The mud conveying system extracts and loads the mud at a second set speed until the mud concentration at the depth corresponding to the target excavation position coordinates drops below the set concentration value, wherein the second set speed is greater than the first set speed.

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