Dredging construction method of trailing suction dredger

Abstract

The invention discloses a dredging construction method for a trailing suction dredger, which comprises the following steps: setting a construction route in a GPS (Global Positioning System) positioning device, and setting a target downward digging position coordinate of the trailing suction dredger on the construction route in the GPS positioning device; the drag suction dredger moves according to a construction route set in the GPS positioning device, the drag head is started to descend into a mud layer every time the drag suction dredger moves by a first set distance, the mud concentration at the current depth is detected through the mud concentration sensor, and when the mud concentration at the current depth is larger than a set concentration value, the drag head works at the current depth and pumps and loads mud into a cabin. Starting the rake head until the slurry concentration at the current depth is reduced to be lower than a set concentration value, starting the rake head to continuously descend to the next depth, and repeating the process until the rake head reaches the target digging position coordinate until the slurry concentration at the depth corresponding to the target digging position coordinate is reduced to be lower than the set concentration value; and the drag suction dredger completes dredging operation. The drag suction dredging construction efficiency can be improved.

Description

Technical Field

[0001] The 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 dredger is a large self-propelled, bunker-loading dredger equipped with a trailing head excavation tool and a hydraulic mud suction device. When dredging, the trailing suction pipe (also called the trailing head) is lowered to the riverbed, and the vacuum effect of the mud pump is used to absorb mud from the riverbed into the mud bin of the dredger through the trailing head and the mud suction pipe. After the mud bin is full, the dredger is sailed to the mud dumping area to open the mud door to unload the mud, or the excavated mud is directly discharged from the ship. For example, the invention patent with announcement number CN102261086A relates to a double-hull trailing suction dredger without mud tank and its construction method, that is, the trailing arm is lowered to the seabed and sand is taken and mud and sand are loaded into the tank during navigation. However, the existing method mainly relies on manual experience to judge the degree and timing of the trailing head descent during the trailing suction process, but the degree of automation of the trailing head descent and the extraction and loading of mud is still insufficient, which affects the efficiency of the trailing 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 the target digging position coordinates of the trailing hopper ditching vessel on the construction route in the GPS positioning device, and the target digging position coordinates of the trailing hopper ditching vessel on the construction route in the GPS positioning device are determined according to the digging depth of the trailing hopper ditching vessel along the construction route;

[0007] Step 2, the trailing hopper dredger moves according to the construction route set in the GPS positioning device, and divides the construction route into a plurality of 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 position, and the trailing hopper dredger moves the first set distance each time, moves from the previous point position to the next point position, and performs dredging and extraction and loading operations at the current point position, and the width of the working surface of the drag head is equal to the first set distance. When the trailing hopper dredger 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. When the trailing hopper dredger works at the current point position, the drag head of the trailing hopper dredger 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 dragging suction hopper vessel is started to extract and load the 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 dragging suction hopper vessel is started to extract and load the 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 dragging suction 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;

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

[0009] Preferably, in the dredging construction method described above, in 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 trailing hopper 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 sensor, when the mud sensor detects that the mud concentration at the depth corresponding to the target digging position coordinates is greater than a set concentration value, the trailing hopper 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.

[0010] Preferably, in the dredging construction method with 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 trailing hopper barge lowers the trailing hopper head to the depth corresponding to the target digging position coordinates every time it moves a second set distance, and detects the mud concentration at the depth corresponding to the target digging position coordinates by the mud sensor.

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

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

[0013] Preferably, in the dredging construction method using a trailing hopper barge, 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 hopper barge is started to extract and load the mud, and the mud conveying system of the trailing hopper barge 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, and 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 digging position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device, and determining the target digging position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device according to the digging 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, and divides the construction route into a plurality of 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 position, the trailing hopper sucker vessel moves the first set distance each time, moves from the previous point position to the next point position, and performs dredging and extraction and loading operations at the current point position, the width of the working surface of the drag head is 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 front point, the drag head of the trailing suction hopper ship 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 ship is started to extract and load the mud until the mud concentration at the current depth drops below the set concentration value, and 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 ship is started to extract and load the 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 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 ship 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; Step three, the trailing suction hopper ship completes the dredging operation. The present invention marks the coordinates of the target excavation position through a GPS positioning device, detects the mud concentration at the position of the drag head according to the mud concentration sensor, controls the descent depth of the drag head according to the mud concentration, ensures that the drag head descends to an appropriate depth, and then extracts the mud, 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 embodied in part through the following description, and in part 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 is further described in 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 digging position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device, and determining the target digging position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device according to the digging 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, and divides the construction route into a plurality of 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 position, and the trailing hopper sucker vessel moves the first set distance from the previous point position to the next point position, and the trailing hopper sucker vessel performs dredging and extraction and loading operations at the current point position, and 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 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 the current point is working, the drag head of the trailing suction hopper ship 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 ship is started to extract and load the mud until the mud concentration at the current depth drops below the set concentration value, and 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 ship is started to extract and load the 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 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 ship 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; Step three, the trailing suction hopper ship completes the dredging operation.

[0021] The present invention first sets a construction route in a GPS positioning device, marks and sets the target digging position coordinates according to the digging depth of the construction route, and then the trailing suction hopper will move and dig according to the settings in the GPS positioning device. After that, whenever the trailing suction hopper moves a first set distance, the drag head descends and is ready to perform dredging operations. The descending depth of the drag head is judged based on the detection result of the mud concentration sensor. As the drag head descends, when the mud concentration is greater than the set concentration value, it means that the drag head has reached a suitable dredging depth, then the drag head stops descending and dredging operations are performed at the current depth. At this time, the mud conveying system is started to extract and load the mud until the mud concentration drops below the set concentration. Next, the drag head descends again until the mud concentration at the next depth reaches above the set concentration value again, then stops dredging operations at the current depth, and starts the mud conveying system to extract and load the mud. Repeat the above process until the target digging position coordinates are reached. When the trailing suction hopper reaches the end of the construction route, the mud loaded in the cabin is discharged. As the trailing suction hopper barge moves forward gradually, it eventually reaches the end of the construction route and completes the dredging construction.

[0022] In the above dredging process, the target excavation position can be the seabed or a certain distance above the seabed, which 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, 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, the target excavation position is at the seabed. The dredger hopper sails along the construction route. Every time it moves the first set distance, the dredger hopper stops moving forward, lowers the dredger head for dredging, and starts the conveying system to extract the mud for loading. The position where the dredger hopper 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 the dredging section. When the dredging ship 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 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 docks at point a, through the operation of the drag head and the conveying system, it can dig 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, the continuous construction of the entire construction route by the drag suction ship can be achieved. Preferably, the first set distance is determined by the width of the working surface of the drag head, and 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 of the descent of the drag head 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 in the entire 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 of 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 a suitable concentration, ensuring that the mud concentration of the mud conveying system is relatively stable, so as to improve the utilization efficiency of the mud conveying system and ultimately improve the dredging construction efficiency. 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 performed 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 using a trailing hopper vessel, in 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 returns from the end point of the construction route to the starting point of the construction route, and during the return process, the trailing hopper 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 sensor, when the mud sensor detects that the mud concentration at the depth corresponding to the target digging position coordinates is greater than a set concentration value, the trailing hopper 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 the mud until the mud concentration at the depth corresponding to the target digging position coordinates drops below the set concentration value.

[0025] After the trailing suction dredger moves from the starting point to the end point, it returns from the end point to the starting point. During the return process, the drag head is directly lowered to the depth corresponding to the coordinates of the target digging position, and the mud concentration at the depth corresponding to the coordinates of the target digging position is detected by the mud sensor. When the mud depth exceeds the set concentration value, it means that there are omissions in the previous round of construction process. The drag head is used again for dredging operations, and the mud conveying system is used to extract the mud and load it into the cabin. After the above process, the positions that did not meet the standards in the previous round of construction can be corrected and constructed to ensure the overall construction quality.

[0026] In a preferred embodiment, 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 trailing hopper barge lowers the trailing head to the depth corresponding to the target digging position coordinates every time it moves a second set distance, and detects the mud concentration at the depth corresponding to the target digging position coordinates 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 positions, thereby ensuring the overall construction quality.

[0028] In a preferred embodiment, in the trailing suction 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 barge is moored each time in the first round and the second round 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 dredging construction method, the second set distance is greater than the first set distance.

[0031] During the first round of construction, each time the dredger moves the first set distance, the dredger stops at multiple depths to perform dredging operations, and most of the construction progress has been completed. Therefore, the second round of construction is a construction of checking for deficiencies and filling in the gaps. Therefore, in order to improve construction efficiency, the second set distance can be set to be greater than the first set distance.

[0032] In a preferred embodiment, in the dredging construction method using a trailing hopper barge, in the step 2, when the mud concentration at the current depth is greater than a set concentration value, the drag head operates at the current depth, and the mud conveying system of the trailing hopper barge is started to extract and load the mud into the cabin, and the mud conveying system of the trailing hopper barge extracts and loads the mud into the cabin 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 dredging 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 using a trailing suction hopper, 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 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 suction hopper is started to extract and load the mud into the cabin, and the mud conveying system extracts and loads the mud into the cabin 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] In the second round of construction, each time the drag head reaches a certain depth for dredging, the mud conveying system will extract and load the mud into the tank at the second set speed, and the second set speed will be lower than the first set speed. Since the amount of mud to be processed in the second round is small, a higher speed can be used to fully utilize the working capacity of the mud conveying system and improve the 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 digging position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device, and determining the target digging position coordinates of the trailing hopper sucker vessel on the construction route in the GPS positioning device according to the digging 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, and divides the construction route into a plurality of 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 position, and the trailing hopper sucker vessel moves the first set distance each time, from a previous point position to a next point position, and the trailing hopper sucker vessel performs dredging and extraction and loading operations at the current point position, and 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 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 the current point is working, the drag head of the trailing suction hopper ship 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 ship is started to extract and load the mud until the mud concentration at the current depth drops below the set concentration value, and 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 ship is started to extract and load the 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 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 ship 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; Step three, the trailing suction hopper ship completes the dredging operation. The present invention marks the coordinates of the target excavation position through a GPS positioning device, detects the mud concentration at the position of the drag head according to the mud concentration sensor, controls the descent depth of the drag head according to the mud concentration, ensures that the drag head descends to an appropriate depth, and then extracts the mud, 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 the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

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 the target digging position coordinates of the trailing hopper ditching vessel on the construction route in the GPS positioning device, and the target digging position coordinates of the trailing hopper ditching vessel on the construction route in the GPS positioning device are determined according to the digging depth of the trailing hopper ditching vessel along the construction route; Step 2, the trailing hopper dredger moves according to the construction route set in the GPS positioning device, and divides the construction route into a plurality of 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 position, and the trailing hopper dredger moves the first set distance each time, moves from the previous point position to the next point position, and performs dredging and extraction and loading operations at the current point position, and the width of the working surface of the drag head is equal to the first set distance. When the trailing hopper dredger 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. When the trailing hopper dredger works at the current point position, the drag head of the trailing hopper dredger 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 dragging suction hopper vessel is started to extract and load the 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 dragging suction hopper vessel is started to extract and load the 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 dragging suction 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; Step 3: The trailing suction hopper barge completes the dredging operation.

2. The dredging construction method of a trailing suction hopper vessel according to claim 1, characterized in that: 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 in the process of returning, 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 sensor, when the mud sensor detects that the mud concentration at the depth corresponding to the target digging position coordinates is greater than the 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, characterized in that: In the step three, the trailing suction dredge returns from the end point of the construction route to the starting point of the construction route, and during the return process, the trailing suction dredge lowers the trailing suction dredge 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.

4. The dredging construction method of a trailing suction hopper vessel as claimed in claim 3, characterized in that: The second set distance has a different value from the first set distance.

5. The dredging construction method using a trailing suction hopper vessel as claimed in claim 4, characterized in that: The second set distance is greater than the first set distance.

6. The dredging construction method of a trailing suction hopper vessel according to claim 1, characterized in that: 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 dragging hopper barge is started to extract and load the mud into the tank. The mud conveying system of the dragging hopper barge extracts and loads the mud into the tank 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 as claimed in claim 6, characterized in that: 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 drag suction vessel 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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