A construction method for dredging works at a bulk cargo terminal

Abstract

The present invention provides a construction method for a bulk cargo terminal dredging project, belonging to the technical field of terminal dredging projects; the construction method for the bulk cargo terminal dredging project uses a grab dredger and a trailing suction hopper dredger, and the trailing suction hopper dredger is provided with a draghead assembly; by using the grab dredger to dredge the higher parts of the seabed, fixed-point dredging of the dredging area is achieved, which not only improves the dredging effect on the dredging area, but also improves the dredging efficiency of the dredging area. At the same time, by using the trailing suction hopper dredger to dredge the entire dredging area and taking advantage of the characteristic that the trailing suction hopper dredger can dredge the seabed without berthing, the dredging speed of the dredging area is improved, thereby reducing the number of voyages of the trailing suction hopper dredger in the dredging area, and further improving the dredging efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of wharf dredging engineering, and particularly relates to a construction method for a bulk cargo wharf dredging project. Background Art

[0002] In the related art, before the construction of a bulk cargo wharf, in order to ensure the normal use of the bulk cargo wharf, it is necessary to dredge the seabed area of the bulk cargo wharf to remove the silt on the seabed.

[0003] Currently, for wharf dredging construction, a trailing suction hopper dredger is mainly used to remove the seabed silt. Since the trailing suction hopper dredger needs to make multiple reciprocating voyages in the dredging area during operation, the dredging efficiency is reduced. Summary of the Invention

[0004] In order to solve the problem in the above-mentioned prior art that since the trailing suction hopper dredger needs to make multiple reciprocating voyages in the dredging area during operation, the dredging efficiency is reduced, the present invention provides a construction method for a bulk cargo wharf dredging project. By using a grab dredger to dredge the higher parts of the seabed, fixed-point dredging of the dredging area is achieved, which not only improves the dredging effect on the dredging area but also improves the dredging efficiency on the dredging area. At the same time, by using a trailing suction hopper dredger to dredge the entire dredging area and taking advantage of the characteristic that the trailing suction hopper dredger can dredge the seabed without being stationed, the dredging speed of the dredging area is improved, thereby reducing the number of voyages of the trailing suction hopper dredger in the dredging area, and further improving the dredging efficiency. The specific technical solution is as follows:

[0005] A bulk cargo terminal dredging construction method, which uses a grab dredger and a trailing suction hopper dredger. The trailing suction hopper dredger is provided with a drag head assembly. The bulk cargo terminal dredging construction method includes: S1, re-surveying the water depth and topography before dredging, and drawing an original cross-section diagram of the seabed. Before dredging and silting, a construction water gauge is set, and the silting depth is determined according to water level changes; S2, according to the original cross-section diagram of the seabed, the lowest point of the seabed is determined, and a point that is more than 20 meters away from the lowest point of the seabed is determined, and the above point is set as a point to be excavated. S3, according to GPS positioning, drive the grab dredger to a point 30 meters above the point to be excavated and park the grab dredger; S4, make the grab dredger dredge within a radius of 20 meters of the point to be excavated, and the dredging depth should be plus or minus 6 meters from the lowest point of the seabed on the original cross-section of the seabed; S5, after the grab dredger has completed multiple points to be excavated, re-measure the water depth and terrain, set the construction water gauge, and re-determine the dredging depth according to the water level change. If the plus or minus difference of each position on the seabed exceeds 6 meters, repeat the steps. S3, if the difference between the positive and negative positions of each seabed is no more than 6 meters, proceed to the next step; S6, sail the empty-loaded trailing suction hopper dredger close to the starting point of excavation, align the mark (route), determine the ship's position, and reduce the speed; put the drag head assembly into the water, start the mud pump to suck water, and wait for the drag head assembly to touch the bottom; S7, make the trailing suction hopper dredger moderately increase the speed of the dredger over the ground, make the mud pump suck up the mud, drive into the excavation groove according to the predetermined forward heading, and make the drag head assembly dig mud and sand; Among them, the trailing suction hopper dredger adopts the construction of segmentation, layering, striping and other processes, striping The width is 20m, and the overlap between adjacent strips is 1-2m; S8, after the trailing suction hopper dredger sucks the mud loosened by the drag head assembly into the mud chamber through the centrifugal mud pump, and after the mud chamber is full, lift the drag head assembly, and sail the trailing suction hopper dredger to the mud dumping area, open the mud door at the bottom of the mud chamber to dump the mud, and then sail to the dredging area without load to carry out the next cycle of dredging construction; S9, after the trailing suction hopper dredger completes the entire dredging area, re-measure the water depth and topography to determine whether it meets the requirements. If so, the dredging project is terminated. If not, repeat step S6.

[0006] In addition, the bulk cargo terminal dredging construction method in the above technical solution provided by the present invention may also have the following additional technical features:

[0007] In the above technical solution, the construction method of the bulk terminal dredging project also includes: S7.1, the trailing suction hopper dredger adopts multi-layer excavation construction, and the trailing suction hopper dredger dredge layer thickness is 1.5 to 2m; among which, the elevation of the trailing suction hopper dredger construction area shall not be higher than -8.0m, and the soil layer with an elevation above -8.0m shall be excavated by a grab dredger.

[0008] In the above technical solution, the rake head assembly includes: a housing, a mud pushing plate, a guide cylinder, a first support plate, a second support plate, a first rotating shaft, and a spiral blade; the housing is a hollow cavity; the mud pushing plate is arc-shaped, the mud pushing plate is embedded in the housing, and the mud pushing plate is connected to the inner wall of the housing; the guide cylinder is a hollow cavity with openings at both ends, one end of the guide cylinder passes through the side wall of the housing, the other end of the guide cylinder is connected to a centrifugal mud pump, and the guide cylinder is fixed on the side wall of the housing; a plurality of first water permeable holes are provided on the first support plate, the first support plate is embedded in the guide cylinder, and the first support plate is connected to the inner wall of the guide cylinder; a plurality of second water permeable holes are provided on the second support plate, the second support plate is embedded in the guide cylinder, the second support plate is connected to the inner wall of the guide cylinder, and the second support plate is located below the first support plate; the first rotating shaft is embedded in the guide cylinder, one end of the first rotating shaft is rotatably connected to the first support plate, and the other end of the first rotating shaft is rotatably connected to the second support plate; a plurality of spiral blades are embedded in the guide cylinder, and the plurality of spiral blades are sleeved on the outside of the first rotating shaft; wherein, the diameter of the first water permeable hole is smaller than the diameter of the second water permeable hole.

[0009] In the above technical solution, the rake head assembly includes: a first underwater motor and a guide plate; the first underwater motor is provided with a first output shaft, the first underwater motor is fixed on the first support plate, and the first output shaft of the first underwater motor is connected to the first rotating shaft; the guide plate is embedded in the housing, the guide plate is connected to the inner wall of the housing, and the guide plate is located on one side of the guide cylinder.

[0010] In the above technical solution, the rake head assembly includes: a second rotating shaft and a rotating cylinder; the second rotating shaft sequentially passes through the two side walls of the housing, and the second rotating shaft is rotatably connected to the housing; a plurality of rake teeth are provided on the outer wall of the rotating cylinder, at least part of the rotating cylinder is embedded in the housing, and the rotating cylinder is sleeved on the outside of the second rotating shaft; wherein, the rotating cylinder is located on one side of the mud pushing plate.

[0011] In the above technical solution, the rake head assembly includes: a second underwater motor, a protective housing, a first pulley, a second pulley, and a first belt; the second underwater motor is provided with a second output shaft, the second underwater motor is fixed on the housing; the protective housing is fixed on the housing, the protective housing is wound around the outside of the second underwater motor, and the second output shaft of the second underwater motor passes through the protective housing; the first pulley is sleeved on the outside of the second output shaft of the second underwater motor; the second pulley is sleeved on the outside of the second rotating shaft, and the second pulley is located outside the housing; the first belt is simultaneously sleeved on the outside of the first pulley and the second pulley.

[0012] In the above technical solution, the rake head assembly includes: a water tank, a water inlet hole, a third rotating shaft, an eccentric wheel, a piston, a first spring, and a water pipe; the water tank is a hollow cavity and is fixed on the outside of the housing; the water inlet hole is provided on the side wall of the water tank; the third rotating shaft passes through both side walls of the water tank in sequence, and the third rotating shaft is rotatably connected to the water tank; the eccentric wheel is embedded in the water tank and is sleeved on the outside of the third rotating shaft; the piston is embedded in the water tank, the piston fits against the inner wall of the water tank, the piston is opposite to the water inlet hole, and the piston fits against the eccentric wheel; the first spring is embedded in the water tank, one end of the first spring is connected to the housing, and the other end of the first spring is connected to the piston; one end of the water pipe passes through the housing, one end of the water pipe is embedded in the water tank, and the other end of the water pipe is located above the mud pushing plate.

[0013] In the above technical solution, the rake head assembly includes: a third pulley, a fourth pulley, and a second belt; the third pulley is sleeved on the outside of the second rotating shaft; the fourth pulley is sleeved on the outside of the third rotating shaft; the second belt is simultaneously sleeved on the outside of the third pulley and the fourth pulley.

[0014] In the above technical solution, the rake head assembly includes: a mounting cylinder, a moving plate, a connecting rod, a roller, and a second spring; the mounting cylinder is fixed at the bottom of the housing; the moving plate is embedded in the mounting cylinder; one end of the connecting rod is connected to the moving plate, and the other end of the connecting rod passes through the mounting cylinder; the roller is connected to the other end of the connecting rod; the second spring is embedded in the mounting cylinder, the second spring is wound around the outside of the connecting rod, one end of the second spring is connected to the moving plate, and the other end of the second spring is connected to the mounting cylinder.

[0015] In the above technical solution, the rake head assembly includes: sliding grooves; two sliding grooves are provided on the opposite inner walls of the mounting cylinder, and both ends of the moving plate are embedded in the two sliding grooves.

[0016] A construction method for a bulk cargo terminal dredging project according to the present invention, compared with the prior art, has the following beneficial effects:

[0017] 1. By using a grab dredger to dredge the higher parts of the seabed to achieve fixed-point dredging of the dredging area, not only the dredging effect of the dredging area is improved, but also the dredging efficiency of the dredging area is enhanced. At the same time, by using a trailing suction hopper dredger to dredge the entire dredging area and taking advantage of the characteristic that the trailing suction hopper dredger can dredge the seabed without being stationed, the dredging speed of the dredging area is increased, thereby reducing the number of voyages of the trailing suction hopper dredger in the dredging area, and further enhancing the dredging efficiency.

[0018] 2. By using the trailing suction hopper dredger to conduct layered excavation construction with a layered thickness of 1.5 to 2 m, the dredging effect of the trailing suction hopper dredger is improved. At the same time, damage to the rake head assembly of the trailing suction hopper dredger is avoided, so as to enhance the use experience of the product.

[0019] 3. By sleeving multiple spiral blades outside the first rotating shaft, the first rotating shaft is enabled to drive the multiple spiral blades to rotate inside the guide cylinder, so as to break up the large lumps of silt flowing into the guide cylinder. This can not only prevent the silt from blocking the centrifugal sludge pump, but also ensure the efficiency of the centrifugal sludge pump in sucking silt.

[0020] 4. By fixing the first underwater motor on the first support plate and connecting the first output shaft of the first underwater motor to the first rotating shaft, the first underwater motor is enabled to drive the first rotating shaft to rotate, so as to break up the silt by the multiple spiral blades and prevent the silt from blocking the centrifugal sludge pump.

[0021] 5. By sleeving the drum outside the second rotating shaft and arranging multiple rake teeth on the outer wall of the drum, the second rotating shaft is enabled to drive the drum to rotate, so as to break up the silt on the seabed by the rake teeth on the drum, reduce the difficulty of the sludge pushing plate in shoveling up the silt, and further improve the effect of sucking silt.

[0022] 6. By sleeving the first pulley outside the second output shaft of the second underwater motor, sleeving the second pulley outside the second rotating shaft, and sleeving the first belt outside both the first pulley and the second pulley, the second underwater motor is enabled to drive the second rotating shaft to rotate through the first pulley, the second pulley and the first belt, so as to break up the silt on the seabed by the rake teeth on the drum, reduce the difficulty of the sludge pushing plate in shoveling up the silt, and further improve the effect of sucking silt.

[0023] 7. By passing one end of the water pipe through the housing, embedding one end of the water pipe into the water tank, and positioning the other end of the water pipe above the sludge pushing plate, when the piston moves towards the water pipe, the piston can push the seawater in the water tank to spray out through the water pipe onto the sludge pushing plate, so as to break up the silt adhered to the sludge pushing plate and facilitate the centrifugal sludge pump in sucking the silt.

[0024] 8. By sleeving the third pulley outside the second rotating shaft, sleeving the fourth pulley outside the third rotating shaft, and sleeving the second belt outside both the third pulley and the fourth pulley, when the second rotating shaft rotates, the second rotating shaft can drive the third rotating shaft to rotate through the third pulley, the fourth pulley and the second belt, so as to eliminate the need for an additional driving device to drive the third rotating shaft and reduce the production cost of the product.

[0025] 9. When the trailing suction hopper dredger drags the draghead assembly to move on the seabed, the rollers move on the seabed, thus improving the mobility of the draghead assembly; when the draghead assembly encounters a protrusion on the seabed, the rollers drive the connecting rod and the moving plate to move upward, thus achieving the shock absorption effect of the draghead assembly.

[0026] 10. By arranging two sliding grooves on the opposite inner walls of the installation cylinder and embedding both ends of the moving plate into the two sliding grooves, the moving plate can be made to move within the sliding grooves, thereby preventing the moving plate from shifting during movement and enhancing the stability of the moving plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flowchart of a construction method for a bulk cargo terminal dredging project of the present invention;

[0028] Figure 2 is a cross-sectional view of the drag head assembly of the present invention;

[0029] Figure 3 is Figure 2 a partial enlarged view of part A of

[0030] Figure 4 is Figure 2 a partial enlarged view of part B of

[0031] Figure 5 is a front view of the drag head assembly of the present invention;

[0032] Figure 6 is a rear view of the drag head assembly of the present invention;

[0033] Among them, Figures 2 to 6 the correspondence between the reference numerals and component names in

[0034] 10 housing, 11 mud pushing plate, 12 guide cylinder, 13 first support plate, 14 second support plate, 15 first rotating shaft, 16 spiral blade, 17 first underwater motor, 18 guide plate, 19 second rotating shaft, 20 rotating cylinder, 21 second underwater motor, 22 protective shell, 23 first pulley, 24 second pulley, 25 first belt, 26 water tank, 27 water inlet hole, 28 third rotating shaft, 29 eccentric wheel, 30 piston, 31 first spring, 32 water pipe, 33 third pulley, 34 fourth pulley, 35 second belt, 36 installation cylinder, 37 moving plate, 38 connecting rod, 39 roller, 40 second spring, 41 sliding groove, 42 first water permeable hole, 43 second water permeable hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following further describes the present invention in conjunction with specific implementation cases and attached Figures 1 - 6 drawings, but the present invention is not limited to these embodiments.

[0036] A construction method for a bulk cargo terminal dredging project, as Figure 1As shown, the bulk cargo terminal dredging project construction method uses a grab dredger and a trailing suction hopper dredger. The trailing suction hopper dredger is provided with a drag head assembly. The bulk cargo terminal dredging project construction method includes: S1, re-surveying the water depth and topography before dredging, and drawing the original cross-section of the seabed. Before dredging and silting, a construction water gauge is set, and the silting depth is mastered according to the water level change; S2, according to the original cross-section of the seabed, the lowest point of the seabed is determined, and the points with a difference of more than 20 meters from the lowest point of the seabed are determined, and the above points are set as the points to be excavated; S3, according to the G PS positioning, drive the grab dredger to a point 30 meters above the point to be excavated, and park the grab dredger; S4, make the grab dredger dredge within a radius of 20 meters of the point to be excavated, and the dredging depth differs from the lowest point of the seabed on the original seabed cross-section by plus or minus 6 meters; S5, after the grab dredger completes multiple points to be excavated, re-measure the water depth and terrain, set the construction water gauge, and re-master the dredging depth according to the water level change. If the difference between the various seabed positioning is more than 6 meters, repeat step S3, and if the seabed The positive and negative difference of each positioning is no more than 6 meters, and the next step is continued; S6, the trailing suction hopper dredger is sailed unloaded to the starting point of excavation, the mark (route) is aligned, the ship position is determined, and the speed is reduced; the drag head assembly is placed in the water, the mud pump is started to absorb water, and the drag head assembly is allowed to touch the bottom; S7, the trailing suction hopper dredger is made to increase the speed of the dredger over the ground appropriately, so that the mud pump sucks up the mud, and it enters the excavation groove according to the predetermined forward heading, so that the drag head assembly digs the mud and sand; wherein, the dredging of the trailing suction hopper dredger is carried out by segmentation, layering, striping and other processes, and the strip width is 2 0m, with 1-2m overlap between adjacent strips; S8, after the trailing suction hopper dredger sucks the mud loosened by the drag head assembly into the mud chamber through the centrifugal mud pump, and after the mud chamber is full, lift the drag head assembly, and sail the trailing suction hopper dredger to the mud dumping area, open the mud door at the bottom of the mud chamber to dump the mud, and then sail to the dredging area without load to carry out the next cycle of dredging construction; S9, after the trailing suction hopper dredger completes the entire dredging area, re-measure the water depth and topography to determine whether it meets the requirements. If so, the dredging project is terminated, otherwise, repeat step S6.

[0037] Through steps S1 and S2, the locations requiring dredging on the seabed are clearly identified, thereby improving dredging effectiveness. Through step S3, the grab dredger's stability and accuracy in dredging are enhanced. Through steps S4 and S5, the dredging effect at higher seabed locations is improved. Through steps S6, S7, and S8, the entire dredging area is dredged using a trailing suction hopper dredger, thereby improving the dredging effect and efficiency of the trailing suction hopper dredger in the dredged area.

[0038] By adopting the above steps, dredging and excavating the higher positions on the seabed by a grab dredger to achieve fixed-point dredging of the dredging area not only improves the dredging effect of the dredging area but also enhances the dredging efficiency of the dredging area. At the same time, by using a trailing suction hopper dredger to dredge the entire dredging area and taking advantage of the characteristic that the trailing suction hopper dredger can dredge the seabed without being stationed, the dredging speed of the dredging area is increased, thereby reducing the number of voyages of the trailing suction hopper dredger in the dredging area and further enhancing the dredging efficiency.

[0039] In an embodiment of the present invention, as Figure 1 shown, the construction method for the bulk cargo terminal dredging project further includes: S7.1, the trailing suction hopper dredger adopts multi-layer excavation construction, and the dredging layer thickness of the trailing suction hopper dredger is 1.5 to 2 m; among them, the elevation of the construction area of the trailing suction hopper dredger shall not be higher than -8.0 m, and the soil layer above the elevation of -8.0 m is excavated by a grab dredger.

[0040] By making the trailing suction hopper dredger carry out multi-layer excavation construction according to the layer thickness of 1.5 to 2 m, the dredging effect of the trailing suction hopper dredger is improved. At the same time, the damage to the drag head assembly of the trailing suction hopper dredger is avoided to enhance the use experience of the product.

[0041] In an embodiment of the present invention, as Figures 2 to 6 shown, the drag head assembly includes: a housing 10, a mud pushing plate 11, a draft tube 12, a first support plate 13, a second support plate 14, a first rotating shaft 15, and a spiral blade 16; the housing 10 is a hollow cavity; the mud pushing plate 11 is arc-shaped, the mud pushing plate 11 is embedded in the housing 10, and the mud pushing plate 11 is connected to the inner wall of the housing 10; the draft tube 12 is a hollow cavity with openings at both ends, one end of the draft tube 12 passes through the side wall of the housing 10, the other end of the draft tube 12 is connected to a centrifugal mud pump, and the draft tube 12 is fixed on the side wall of the housing 10; the first support plate 13 is provided with a plurality of first water permeable holes 42, the first support plate 13 is embedded in the draft tube 12, and the first support plate 13 is connected to the inner wall of the draft tube 12; the second support plate 14 is provided with a plurality of second water permeable holes 43, the second support plate 14 is embedded in the draft tube 12, the second support plate 14 is connected to the inner wall of the draft tube 12, and the second support plate 14 is located below the first support plate 13; the first rotating shaft 15 is embedded in the draft tube 12, one end of the first rotating shaft 15 is rotatably connected to the first support plate 13, and the other end of the first rotating shaft 15 is rotatably connected to the second support plate 14; a plurality of spiral blades 16 are embedded in the draft tube 12, and a plurality of spiral blades 16 are sleeved outside the first rotating shaft 15; among them, the diameter of the first water permeable hole 42 is smaller than the diameter of the second water permeable hole 43.

[0042] By embedding the arc-shaped mud pushing plate 11 into the housing 10 and connecting the mud pushing plate 11 to the inner wall of the housing 10, when the trailing suction dredger drives the drag head assembly to move on the seabed, the mud pushing plate 11 shovels up the silt on the seabed, so that the silt is separated from the seabed. By passing one end of the draft tube 12 through the side wall of the housing 10 and connecting the other end of the draft tube 12 to the centrifugal mud pump, the centrifugal mud pump sucks the silt shoveled up by the mud pushing plate 11 into the draft tube 12; by connecting the first support plate 13 and the second support plate 14 to the inner wall of the draft tube 12 and rotatably connecting both ends of the first rotating shaft 15 to the first support plate 13 and the second support plate 14 respectively, the first support plate 13 and the second support plate 14 support the first rotating shaft 15, so that the first rotating shaft 15 can rotate in the draft tube 12. At the same time, by respectively arranging the first water-permeable holes 42 and the second water-permeable holes 43 on the first support plate 13 and the second support plate 14, the silt can pass through the first water-permeable holes 42 and the second water-permeable holes 43 and enter the centrifugal mud pump, so that the large lumps of silt are filtered through the first water-permeable holes 42 and the second water-permeable holes 43, avoiding the centrifugal mud pump being blocked by the large lumps of silt. By sleeving a plurality of spiral blades 16 on the outside of the first rotating shaft 15, the first rotating shaft 15 drives the plurality of spiral blades 16 to rotate in the draft tube 12, so that the large lumps of silt flowing into the draft tube 12 are broken up, which can not only avoid the silt blocking the centrifugal mud pump, but also ensure the efficiency of the centrifugal mud pump sucking the silt.

[0043] In an embodiment of the present invention, as Figures 2 to 6 shown, the drag head assembly includes: a first underwater motor 17 and a deflector 18; the first underwater motor 17 is provided with a first output shaft, the first underwater motor 17 is fixed on the first support plate 13, and the first output shaft of the first underwater motor 17 is connected to the first rotating shaft 15; the deflector 18 is embedded in the housing 10, the deflector 18 is connected to the inner wall of the housing 10, and the deflector 18 is located on one side of the draft tube 12.

[0044] By fixing the first underwater motor 17 on the first support plate 13 and connecting the first output shaft of the first underwater motor 17 to the first rotating shaft 15, the first underwater motor 17 drives the first rotating shaft 15 to rotate, so that the plurality of spiral blades 16 break up the silt, avoiding the silt blocking the centrifugal mud pump.

[0045] In an embodiment of the present invention, as Figures 2 to 6 shown, the drag head assembly includes: a second rotating shaft 19 and a rotating drum 20; the second rotating shaft 19 sequentially passes through both side walls of the housing 10, and the second rotating shaft 19 is rotatably connected to the housing 10; a plurality of rake teeth are provided on the outer wall of the rotating drum 20, at least part of the rotating drum 20 is embedded in the housing 10, and the rotating drum 20 is sleeved on the outside of the second rotating shaft 19; wherein, the rotating drum 20 is located on one side of the mud pushing plate 11.

[0046] By passing the second rotating shaft 19 through the two side walls of the housing 10 in sequence and rotatably connecting the second rotating shaft 19 with the housing 10, the housing 10 supports the second rotating shaft 19, so that the second rotating shaft 19 can rotate within the housing 10. By sleeving the drum 20 on the outside of the second rotating shaft 19 and arranging a plurality of rake teeth on the outer wall of the drum 20, the second rotating shaft 19 can drive the drum 20 to rotate, so that the rake teeth on the drum 20 disperse the silt on the seabed, reducing the difficulty for the mud pushing plate 11 to scoop up the silt, and thus improving the effect of absorbing silt.

[0047] In an embodiment of the present invention, as Figures 2 to 6 shown, the rake head assembly includes: a second underwater motor 21, a protective housing 22, a first pulley 23, a second pulley 24 and a first belt 25; the second underwater motor 21 is provided with a second output shaft, and the second underwater motor 21 is fixed on the housing 10; the protective housing 22 is fixed on the housing 10, the protective housing 22 is wound around the outside of the second underwater motor 21, and the second output shaft of the second underwater motor 21 passes through the protective housing 22; the first pulley 23 is sleeved on the outside of the second output shaft of the second underwater motor 21; the second pulley 24 is sleeved on the outside of the second rotating shaft 19, and the second pulley 24 is located outside the housing 10; the first belt 25 is simultaneously sleeved on the outside of the first pulley 23 and the second pulley 24.

[0048] By fixing the second underwater motor 21 on the housing 10, fixing the protective housing 22 on the housing 10, and winding the protective housing 22 around the outside of the second underwater motor 21, the protective housing 22 protects the second underwater motor 21, preventing the second underwater motor 21 from being damaged. By sleeving the first pulley 23 on the outside of the second output shaft of the second underwater motor 21, sleeving the second pulley 24 on the outside of the second rotating shaft 19, and simultaneously sleeving the first belt 25 on the outside of the first pulley 23 and the second pulley 24, the second underwater motor 21 drives the second rotating shaft 19 to rotate through the first pulley 23, the second pulley 24 and the first belt 25, so that the rake teeth on the drum 20 disperse the silt on the seabed, reducing the difficulty for the mud pushing plate 11 to scoop up the silt, and thus improving the effect of absorbing silt.

[0049] In an embodiment of the present invention, as Figures 2 to 6As shown, the drag head assembly includes: a water tank 26, a water inlet hole 27, a third rotating shaft 28, an eccentric wheel 29, a piston 30, a first spring 31, and a water pipe 32; the water tank 26 is a hollow cavity, and the water tank 26 is fixed on the outside of the housing 10; the water inlet hole 27 is provided on the side wall of the water tank 26; the third rotating shaft 28 passes through the two side walls of the water tank 26 in sequence, and the third rotating shaft 28 is rotatably connected to the water tank 26; the eccentric wheel 29 is embedded in the water tank 26, and the eccentric wheel 29 is sleeved on the outside of the third rotating shaft 28; the piston 30 is embedded in the water tank 26, the piston 30 is in contact with the inner wall of the water tank 26, the piston 30 is opposite to the water inlet hole 27, and the piston 30 is in contact with the eccentric wheel 29; the first spring 31 is embedded in the water tank 26, one end of the first spring 31 is connected to the housing 10, and the other end of the first spring 31 is connected to the piston 30; one end of the water pipe 32 passes through the housing 10, one end of the water pipe 32 is embedded in the water tank 26, and the other end of the water pipe 32 is located above the mud pushing plate 11.

[0050] By arranging the water inlet hole 27 on the side wall of the water tank 26 and fixing the water tank 26 on the outside of the housing 10, seawater can enter the water tank 26. By passing the third rotating shaft 28 through the two side walls of the water tank 26 in sequence and making the third rotating shaft 28 rotatably connected to the water tank 26, the water tank 26 can support the third rotating shaft 28, so that the third rotating shaft 28 can rotate in the water tank 26; at the same time, the eccentric wheel 29 is sleeved on the outside of the third rotating shaft 28, so that the third rotating shaft 28 can drive the eccentric wheel 29 to rotate. By making the piston 30 in contact with the inner wall of the water tank 26, connecting one end of the first spring 31 to the housing 10, and connecting the other end of the first spring 31 to the piston 30, the first spring 31 can support the piston 30; at the same time, the eccentric wheel 29 is in contact with the piston 30, so that when the eccentric wheel 29 rotates, the eccentric wheel 29 drives the piston 30 to move in the water tank 26. By passing one end of the water pipe 32 through the housing 10, embedding one end of the water pipe 32 in the water tank 26, and locating the other end of the water pipe 32 above the mud pushing plate 11, when the piston 30 moves towards the water pipe 32, the piston 30 can push the seawater in the water tank 26 to be sprayed out through the water pipe 32 onto the mud pushing plate 11, so as to break up the mud adhered to the mud pushing plate 11, facilitating the centrifugal mud pump to absorb the mud.

[0051] With the above structure, when the third rotating shaft 28 is rotated to drive the eccentric wheel 29 to rotate, the eccentric wheel 29 drives the piston 30 to move within the water tank 26; when the piston 30 moves towards the water pipe 32, the piston 30 closes the water inlet hole 27 at this time, and at the same time the piston 30 compresses the space within the water tank 26, so that water can be sprayed onto the mud pushing plate 11 through the water pipe 32, thereby realizing the dispersion of the sludge adhered to the mud pushing plate 11 to improve the mud shoveling effect of the mud pushing plate 11. When the piston 30 moves in the direction away from the water pipe 32, the piston 30 opens the water inlet hole 27 at this time, so that water enters the water tank 26.

[0052] Specifically, a check valve is installed on the other end of the water pipe 32.

[0053] In an embodiment of the present invention, as Figures 2 to 6 shown, the rake head assembly includes: a third pulley 33, a fourth pulley 34, and a second belt 35; the third pulley 33 is sleeved on the outside of the second rotating shaft 19; the fourth pulley 34 is sleeved on the outside of the third rotating shaft 28; the second belt 35 is simultaneously sleeved on the outside of the third pulley 33 and the fourth pulley 34.

[0054] By sleeving the third pulley 33 on the outside of the second rotating shaft 19, sleeving the fourth pulley 34 on the outside of the third rotating shaft 28, and sleeving the second belt 35 on the outside of the third pulley 33 and the fourth pulley 34, when the second rotating shaft 19 rotates, the second rotating shaft 19 drives the third rotating shaft 28 to rotate through the third pulley 33, the fourth pulley 34, and the second belt 35, so that there is no need to separately provide a driving device to drive the third rotating shaft 28 to rotate, thereby reducing the production cost of the product.

[0055] In an embodiment of the present invention, as Figures 2 to 6 shown, the rake head assembly includes: a mounting cylinder 36, a moving plate 37, a connecting rod 38, a roller 39, and a second spring 40; the mounting cylinder 36 is fixed to the bottom of the housing 10; the moving plate 37 is embedded in the mounting cylinder 36; one end of the connecting rod 38 is connected to the moving plate 37, and the other end of the connecting rod 38 passes through the mounting cylinder 36; the roller 39 is connected to the other end of the connecting rod 38; the second spring 40 is embedded in the mounting cylinder 36, the second spring 40 is wound around the outside of the connecting rod 38, and one end of the second spring 40 is connected to the moving plate 37, and the other end of the second spring 40 is connected to the mounting cylinder 36.

[0056] By connecting one end of the connecting rod 38 to the moving plate 37 and connecting the roller 39 to the other end of the connecting rod 38, the synchronous movement of the connecting rod 38, the moving plate 37 and the roller 39 is achieved; by winding the second spring 40 around the outer side of the connecting rod 38, connecting one end of the second spring 40 to the moving plate 37, and connecting the other end of the second spring 40 to the mounting cylinder 36, the mounting cylinder 36 supports the moving plate 37 through the second spring 40.

[0057] With the above structure, when the trailing suction hopper dredger drags the draghead assembly to move on the seabed, the roller 39 moves on the seabed, thereby improving the mobility of the draghead assembly; when the draghead assembly encounters a protrusion on the seabed, the roller 39 drives the connecting rod 38 and the moving plate 37 to move upward, thereby achieving the shock absorption effect of the draghead assembly.

[0058] In an embodiment of the present invention, as Figures 2 to 6 shown, the draghead assembly includes: a chute 41; two chutes 41 are provided on the opposite inner walls of the mounting cylinder 36, and both ends of the moving plate 37 are embedded in the two chutes 41.

[0059] By providing two chutes 41 on the opposite inner walls of the mounting cylinder 36 and embedding both ends of the moving plate 37 in the two chutes 41, the moving plate 37 can move in the chute 41, thereby preventing the moving plate 37 from shifting during movement and improving the stability of the moving plate 37.

[0060] In the description of the present invention, the term "plural" means two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention; the terms "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of the present invention, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A bulk cargo terminal dredging construction method, characterized in that: The bulk cargo terminal dredging construction method uses a grab dredger and a trailing suction hopper dredger, wherein the trailing suction hopper dredger is provided with a drag head assembly. The bulk cargo terminal dredging construction method includes: S1. Before dredging, re-measure the water depth and topography, draw the original cross-section of the seabed, set the construction water gauge before dredging, and grasp the dredging depth according to the water level changes; S2, based on the original seabed cross-section, determine the lowest point of the seabed and the points that are more than 20 meters away from the lowest point of the seabed, and set the above points as the points to be excavated; S3, according to GPS positioning, the grab dredger is driven to a position 30 meters above the site to be excavated and is parked; S4, the grab dredger is used to dredge within a radius of 20 meters of the excavation point, and the dredging depth is within a range of plus or minus 6 meters from the lowest point of the seabed on the original seabed cross-section; S5, after the grab dredger has completed multiple excavation points, re-measure the water depth and terrain, set the construction water gauge, and re-determine the dredging depth based on the water level changes. If the difference between the various seabed positionings exceeds 6 meters, repeat step S3. If the difference between the various seabed positionings does not exceed 6 meters, proceed to the next step; S6, sail the trailing suction hopper dredger unloaded close to the starting point of dredging, align with the mark, determine the ship's position, and reduce the speed; put the drag head assembly into the water, start the mud pump to absorb water, and wait for the drag head assembly to touch the bottom; S7: The trailing suction hopper dredger increases its speed over the ground appropriately, causing the mud pump to suck up mud, and then drives into the dredging trench according to the predetermined heading, causing the drag head assembly to dredge the mud and sand. The trailing suction hopper dredger dredges in sections, layers, and strips, with a strip width of 20m and an overlap of 1 to 2m between adjacent strips. S8, after the trailing suction hopper dredger sucks the loosened mud by the drag head assembly into the mud tank through the centrifugal mud pump and the mud tank is full, the drag head assembly is lifted, and the trailing suction hopper dredger sails to the mud dumping area, opens the mud door at the bottom of the mud tank to dump the mud, and then sails to the dredging area without load to carry out the next dredging operation; S9, after the trailing suction hopper dredger has completed the entire dredging area, re-measure the water depth and terrain to determine whether it meets the requirements. If so, the dredging project is terminated. If not, repeat step S6.

2. A bulk cargo terminal dredging construction method according to claim 1, characterized in that: The bulk cargo terminal dredging engineering construction method further comprises: S7.1: Trailing suction hopper dredgers shall adopt multi-layer excavation construction, and the dredging layer thickness of the trailing suction hopper dredger shall be 1.5 to 2 meters; Among them, the elevation of the construction area of the trailing suction dredger shall not be higher than -8.0m, and the soil layer with an elevation above -8.0m shall be excavated by a grab dredger.

3. A bulk cargo terminal dredging construction method according to claim 1, characterized in that: The drag head assembly comprises: A shell, wherein the shell is a hollow cavity; A mud pusher, the mud pusher being in an arc shape, embedded in the shell, and connected to the inner wall of the shell; A guide tube, which is a hollow cavity with openings at both ends. One end of the guide tube passes through the side wall of the shell, and the other end of the guide tube is connected to the centrifugal mud pump, and the guide tube is fixed to the side wall of the shell; a first support plate, wherein a plurality of first water-permeable holes are provided on the first support plate, the first support plate is embedded in the guide tube, and the first support plate is connected to the inner wall of the guide tube; a second support plate, wherein a plurality of second water-permeable holes are provided on the second support plate, the second support plate is embedded in the guide tube, the second support plate is connected to the inner wall of the guide tube, and the second support plate is located below the first support plate; a first rotating shaft, the first rotating shaft being embedded in the guide cylinder, one end of the first rotating shaft being rotatably connected to the first support plate, and the other end of the first rotating shaft being rotatably connected to the second support plate; Spiral blades, wherein a plurality of the spiral blades are embedded in the guide cylinder and sleeved on the outer side of the first rotating shaft; Wherein, the diameter of the first water permeable hole is smaller than the diameter of the second water permeable hole.

4. A bulk cargo terminal dredging construction method according to claim 3, characterized in that: The drag head assembly comprises: a first underwater motor, wherein the first underwater motor is provided with a first output shaft, the first underwater motor is fixed to the first support plate, and the first output shaft of the first underwater motor is connected to the first rotating shaft; A guide plate is embedded in the shell, connected to the inner wall of the shell, and located on one side of the guide cylinder.

5. A bulk cargo terminal dredging construction method according to claim 4, characterized in that: The drag head assembly comprises: a second rotating shaft, the second rotating shaft sequentially passing through two side walls of the shell, and the second rotating shaft is rotatably connected to the shell; a rotating drum, wherein a plurality of rake teeth are provided on the outer wall of the rotating drum, at least a portion of the rotating drum is embedded in the housing, and the rotating drum is sleeved on the outer side of the second rotating shaft; Wherein, the rotating drum is located on one side of the mud pushing plate.

6. A bulk cargo terminal dredging construction method according to claim 5, characterized in that: The drag head assembly comprises: a second underwater motor, the second underwater motor being provided with a second output shaft and being fixed to the housing; a protective shell, wherein the protective shell is fixed to the housing, the protective shell is wound around the outside of the second underwater motor, and the second output shaft of the second underwater motor passes through the protective shell; a first pulley, wherein the first pulley is sleeved on an outer side of a second output shaft of the second underwater motor; a second pulley, wherein the second pulley is sleeved on an outer side of the second rotating shaft and is located on an outer side of the housing; A first belt is simultaneously sleeved on the outside of the first pulley and the second pulley.

7. A bulk cargo terminal dredging construction method according to claim 3, characterized in that: The drag head assembly comprises: A water tank, which is a hollow cavity and is fixed to the outside of the shell; a water inlet hole, the water inlet hole being arranged on the side wall of the water tank; a third rotating shaft, the third rotating shaft sequentially passing through two side walls of the water tank and being rotatably connected to the water tank; A piston is embedded in the water tank, the piston is in contact with the inner wall of the water tank, and the piston is opposite to the water inlet hole; an eccentric wheel, the eccentric wheel being embedded in the water tank, the eccentric wheel being sleeved on the outer side of the third rotating shaft, and the piston being in contact with the eccentric wheel; a first spring, wherein the first spring is embedded in the water tank, one end of the first spring is connected to the housing, and the other end of the first spring is connected to the piston; A water pipe, one end of which passes through the shell, one end of which is embedded in the water tank, and the other end of which is located above the mud pusher.

8. A bulk cargo terminal dredging construction method according to claim 7, characterized in that: The drag head assembly comprises: a third pulley, wherein the third pulley is sleeved on an outer side of the second rotating shaft; a fourth pulley, the fourth pulley being sleeved on the outer side of the third rotating shaft; A second belt is simultaneously sleeved on the outside of the third pulley and the fourth pulley.

9. A bulk cargo terminal dredging construction method according to claim 3, characterized in that: The drag head assembly comprises: a mounting cylinder fixed to the bottom of the housing; a movable plate, the movable plate being embedded in the mounting cylinder; a connecting rod, one end of which is connected to the movable plate, and the other end of which passes through the mounting tube; a roller connected to the other end of the connecting rod; A second spring is embedded in the mounting tube, the second spring is wound around the outside of the connecting rod, one end of the second spring is connected to the moving plate, and the other end of the second spring is connected to the mounting tube.

10. A bulk cargo terminal dredging construction method according to claim 9, characterized in that: The drag head assembly comprises: The two slide grooves are arranged on two opposite inner walls of the mounting cylinder, and the two ends of the movable plate are embedded in the two slide grooves.

Images