Dehydration construction method for dredging bottom mud of rivers and lakes

Abstract

The invention provides a dewatering construction method for river and lake desilting bottom mud, which comprises the following steps: S1, mechanical desilting: desilting the river and lake bottom mud by using desilting mechanical equipment, and excavating the bottom mud; s2, stirring and washing: stirring and filtering the bottom mud by using stirring and filtering equipment, and adding water to form slurry; s3, filtering: carrying out secondary filtering on fine impurities and the like in the slurry, and recycling the filtered slurry for later use; s4, chemical treatment: adding a chemical agent into the slurry, and fully stirring by using stirring equipment; and S5, dehydration treatment: carrying out filter pressing on the slurry by using filter press equipment to remove moisture in the slurry so as to form a mud cake. The river and lake desilting bottom mud can be filtered and washed through the stirring and filtering equipment, large particles in the river and lake desilting bottom mud can be conveniently filtered, the dewatering equipment is prevented from being influenced or damaged in the subsequent dewatering process, and therefore the dewatering cost of the river and lake desilting bottom mud is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dewatering bottom mud during river and lake desilting, and in particular to a dewatering construction method for bottom mud during river and lake desilting. Background Art

[0002] The dredged mud from rivers and lakes usually undergoes simple dehydration, which not only occupies a large area of ​​land resources, but also aggravates the deterioration of the soil and water environment around the storage yard, and is also prone to cause geological disasters such as mud and rock flows and landslides. Therefore, the mud dredged from the bottom of rivers and lakes has a high water content and large reserves, and is not suitable for direct on-site stacking, resource reuse, or long-distance transportation.

[0003] In the prior art, the bottom mud is usually dehydrated by a centrifugal dewatering machine or a belt dewatering machine. However, since the bottom mud of river and lake dredging contains various debris of different sizes, directly dehydrating the bottom mud of river and lake dredging can easily affect or even damage the belt dewatering machine due to the debris inside, thereby increasing the dehydration cost of the bottom mud of river and lake dredging.

[0004] To this end, the present invention provides a dewatering construction method for desilting bottom mud in rivers and lakes. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a dewatering construction method for river and lake dredging sludge to solve the problems raised in the above-mentioned background technology. The present invention can filter and wash the river and lake dredging sludge through stirring and filtering equipment, which is convenient for filtering larger particles inside the sludge, avoiding affecting or damaging the dewatering equipment during the subsequent dewatering process, thereby reducing the dewatering cost of river and lake dredging sludge.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solution: a dewatering construction method for desilting river and lake sludge, comprising: S1: Mechanical dredging: Use dredging machinery to dredge the bottom mud of rivers and lakes and excavate the bottom mud; S2: Agitation and water washing: Use agitation and filtration equipment to agitate and filter the bottom mud and add water to form mud; S3: Filtration: Perform secondary filtration to remove small impurities in the mud, and the filtered mud is recovered for later use; S4: Chemical treatment: Add chemicals to the slurry and mix it thoroughly using mixing equipment.

[0007] S5: Dehydration treatment: Use filter press equipment to filter the mud to remove water from the mud to form a mud cake; S6: Crushing and drying: The bottom mud is crushed and thoroughly dried through crushing equipment and drying equipment.

[0008] Furthermore, the bottom mud excavated in step S1 is directly transported to a bottom mud treatment site, and the bottom mud is placed in the stirring and filtering equipment in step S2, and the bottom mud is preliminarily treated by the stirring and filtering equipment.

[0009] Furthermore, the stirring and filtering equipment in step S2 can filter out larger debris in the bottom mud and can also clean up the larger debris.

[0010] Furthermore, the chemical agent used in step S4 is a polymerized alumina flocculant, and the slurry after adding the chemical agent is passed into the filter press equipment in step S5, and the filter press equipment in step S5 is a plate and frame filter press.

[0011] Furthermore, the stirring and filtering equipment in step S2 includes a box body, a bottom plate is fixedly provided at the bottom of the box body, a stirring mechanism is provided inside the box body through a first servo motor, the stirring mechanism includes a rotating rod and an eccentric wheel, the first servo motor is fixedly provided at the top of the box body, a sterilization mechanism is provided at one end of the bottom plate corresponding to one side of the box body, the rotating rod is rotatably installed inside the box body, stirring blades are fixedly provided on both sides of the bottom end of the rotating rod, the eccentric wheel is fixedly provided at the top end of the rotating rod, the rotating rod is fixedly provided at the bottom end of the output shaft of the first servo motor, annular grooves are provided at the top and bottom of the eccentric wheel, and a water inlet is provided at the top end of the box body corresponding to one side of the first servo motor.

[0012] Furthermore, the sterilization mechanism includes a sterilization box and an ultraviolet sterilization lamp. The sterilization box is fixedly arranged at the bottom end of the box body and one side of the bottom plate. The ultraviolet sterilization lamp is fixedly arranged in a matrix-symmetrical manner inside the sterilization box. A first quartz glass plate and a second quartz glass plate are fixedly arranged between the ultraviolet sterilization lamps at the top and bottom, respectively.

[0013] Furthermore, a collecting box is fixedly provided at one end of the sterilization box, a mud pump installation port is provided on the top of the collecting box, the sterilization box and the collecting box are connected to each other, a discharge port is provided inside the bottom end of the box body at the position corresponding to the sterilization box, the discharge port is connected to the sterilization box, and a lifting mechanism is provided at the discharge port position.

[0014] Furthermore, the lifting mechanism includes an adjusting plate, the cross-sectional shape of the adjusting plate is "T"-shaped, one end of the adjusting plate is slidably set on the outer wall of the box, a fixed block is fixedly set on the top of one end of the adjusting plate, a second servo motor is fixedly set on the top of the fixed block, a screw is fixedly set on the output shaft of the second servo motor, the adjusting screw is threadedly installed inside one end of the adjusting plate, and the bottom end of the adjusting plate is blocked inside the discharge outlet.

[0015] Furthermore, an extrusion filtering mechanism is provided at the top of the box body, and the extrusion filtering mechanism includes a filter screen and an extrusion plate. An inlet is opened on one side of the top of the box body, and the filter screen is fixedly arranged at an angle below the inlet corresponding to the interior of the box body. A bottom baffle is provided below the inlet through a hinge, and one end of the bottom baffle is fixedly connected to the box body through a fixing bolt.

[0016] Furthermore, a pull rod is slidingly provided inside the filter, and an extrusion plate and a limit frame are fixedly provided at both ends of the pull rod. The extrusion plate is slidingly provided below the corresponding entrance on one side of the filter, and the limit frame is in the shape of a "U". A sliding rod is fixedly provided on the inner walls at both ends of the limit frame, and the sliding rod is slidingly provided inside the annular groove, and one end of the eccentric wheel is movably provided between the two ends of the limit frame.

[0017] The beneficial effects of the present invention are as follows: a dehydration construction method for dredging sludge in rivers and lakes of the present invention comprises a box body, an inlet, a water inlet, a first servo motor, a bottom baffle, a bottom plate, a sterilization box, a collection box, a mud pump installation port, a lifting mechanism, a rotating rod, an eccentric wheel, a stirring blade, a filter screen, an extrusion plate, a pull rod, a first quartz glass plate, a second quartz glass plate, an ultraviolet sterilization lamp, an adjustment plate, a fixed block, a second servo motor, a screw, and a limit frame.

[0018] 1. The dewatering construction method of river and lake dredging sludge can push and pull the limit frame, the pull rod and the pressure plate through the first servo motor, the rotating rod and the eccentric wheel, so that the river and lake dredging sludge between the extrusion plate and the filter can be squeezed, and the larger debris in the river and lake dredging sludge can be filtered through the filter to prevent the larger debris in the river and lake dredging sludge from affecting or damaging the subsequent dewatering; by opening the bottom baffle downwards, the filtered larger debris can be cleaned conveniently to avoid affecting the subsequent filtration; at the same time, the river and lake dredging sludge and water inside the box can be mixed and stirred by the first servo motor, the rotating rod and the stirring blades to form mud and improve its fluidity.

[0019] 2. The dewatering construction method of the river and lake dredging sludge can adjust the lifting and lowering of the adjustment plate through the second servo click and the screw, so that the adjustment plate can close the discharge port, which is convenient for mixing and stirring the river and lake dredging sludge; by adjusting the adjustment plate upward, the mud can be discharged into the interior of the sterilization box, which is convenient for sterilizing the mud.

[0020] 3. The dehydration construction method for river and lake dredging sludge can isolate the ultraviolet germicidal lamp through the first quartz glass plate and the second quartz glass plate, so that the light of the ultraviolet germicidal lamp can irradiate the mud surface without affecting the bactericidal effect of the ultraviolet germicidal lamp, thereby facilitating the sterilization of the mud and preventing the bacteria inside the mud from affecting the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of a dewatering construction method for desilting river and lake sediments according to the present invention; Figure 2 This is a structural diagram of a stirring and filtering device for a dewatering construction method for desilting river and lake sludge according to the present invention; Figure 3 This is a front cross-sectional view of a stirring and filtering device for a dewatering construction method for desilting river and lake sediments according to the present invention; Figure 4 The present invention is a dewatering construction method for desilting river and lake sludge Figure 3 Enlarged view of point A in the middle; Figure 5 A partial structural cross-sectional view of a stirring and filtering device for a dewatering method for desilting river and lake sediments according to the present invention; Figure 6 This is a structural diagram of the extrusion mechanism of the stirring and filtering equipment of the dewatering construction method for desilting the bottom mud of rivers and lakes according to the present invention; In the figure: 1. Box body; 2. Inlet; 3. Water inlet; 4. First servo motor; 5. Bottom baffle; 6. Bottom plate; 7. Sterilization box; 8. Collection box; 9. Mud pump installation port; 10. Lifting mechanism; 11. Rotating rod; 12. Eccentric wheel; 13. Stirring blade; 14. Filter; 15. Extrusion plate; 16. Pull rod; 17. First quartz glass plate; 18. Second quartz glass plate; 19. UV sterilizer lamp; 20. Adjustment plate; 21. Fixing block; 22. Second servo motor; 23. Screw; 24. Limiting frame. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] See also Figures 1 to 6 The present invention provides a technical solution: a dewatering construction method for desilting river and lake sludge, comprising: S1: Mechanical dredging: Use dredging machinery to dredge the bottom mud of rivers and lakes and excavate the bottom mud; S2: Agitation and water washing: Use agitation and filtration equipment to agitate and filter the bottom mud and add water to form mud; S3: Filtration: Perform secondary filtration to remove small impurities in the mud, and the filtered mud is recovered for later use; S4: Chemical treatment: Add chemicals to the slurry and stir it thoroughly using mixing equipment; S5: Dehydration treatment: Use filter press equipment to filter the mud to remove water from the mud to form a mud cake; S6: Crushing and drying: The bottom mud is crushed and thoroughly dried through crushing equipment and drying equipment.

[0024] In this embodiment, the bottom mud excavated in step S1 is directly transported to the bottom mud treatment site, and the bottom mud is placed in the stirring and filtering equipment in step S2. The bottom mud is preliminarily treated by the stirring and filtering equipment. The stirring and filtering equipment in step S2 can filter larger debris in the bottom mud and can also clean up the larger debris. The chemical agent used in step S4 is a polyalumina flocculant. The mud after adding the chemical agent is passed into the filter press equipment in step S5. The filter press equipment in step S5 is a plate and frame filter press. Through the above steps, the debris in the river and lake dredging bottom mud can be fully cleaned, and the chemical agents are used to accelerate the dehydration efficiency of the river and lake dredging bottom mud during the dehydration process. The generated mud cake can be crushed and dried by the crushing equipment and the drying equipment, which is convenient for fully drying the river and lake dredging bottom mud.

[0025] In this embodiment, the stirring and filtering equipment in step S2 includes a box body 1, a bottom plate 6 is fixedly provided at the bottom of the box body 1, a stirring mechanism is provided inside the box body 1 through a first servo motor 4, and the stirring mechanism includes a rotating rod 11 and an eccentric wheel 12. The first servo motor 4 is fixedly provided at the top of the box body 1, and a sterilization mechanism is provided on one side of the box body 1 at one end of the bottom plate 6. The rotating rod 11 is rotatably installed inside the box body 1, and stirring blades 13 are fixedly provided on both sides of the bottom end of the rotating rod 11. The eccentric wheel 12 is fixedly provided at the top end of the rotating rod 11, and the rotating rod 11 is fixedly provided at the bottom end of the output shaft of the first servo motor 4. The top and bottom of the eccentric wheel 12 An annular groove is provided, and a water inlet 3 is provided on one side of the top of the box body 1 corresponding to the first servo motor 4. The sterilization mechanism includes a sterilization box 7 and an ultraviolet germicidal lamp 19. The sterilization box 7 is fixedly arranged on the bottom end of the box body 1 and on one side of the bottom plate 6. The ultraviolet germicidal lamp 19 is fixedly arranged in a matrix symmetrically inside the sterilization box 7. A first quartz glass plate 17 and a second quartz glass plate 18 are fixedly arranged between the top and bottom of the ultraviolet germicidal lamp 19, respectively. A collecting box 8 is fixedly provided at one end of the sterilization box 7. A mud pump installation port 9 is provided on the top of the collecting box 8. The sterilization box 7 and the collecting box 8 are connected to each other. A discharge port is provided at the bottom end of the box body 1 corresponding to the position of the sterilization box 7. The outlet is communicated with the sterilization box 7, and a lifting mechanism 10 is provided at the position of the discharge outlet. The lifting mechanism 10 includes an adjusting plate 20. The cross-sectional shape of the adjusting plate 20 is "T"-shaped. One end of the adjusting plate 20 is slidably provided on the outer wall of the box body 1, and a fixed block 21 is fixedly provided on the top of one end of the adjusting plate 20. A second servo motor 22 is fixedly provided on the top of the fixed block 21. A screw 23 is fixedly provided on the output shaft of the second servo motor 22. The adjusting screw 23 is screwed and installed inside one end of the adjusting plate 20. The bottom end of the adjusting plate 20 is blocked inside the discharge outlet. The bottom of the filtered river and lake can be desilted by the first servo motor 4, the rotating rod 11 and the stirring blade 13. , cement are mixed and stirred, and the upward adjustment of the adjustment plate 20 is adjusted by the second servo motor 22 and the screw 23, so that the mud inside the box 1 can flow along the second quartz glass plate 18, and the mud is sterilized and disinfected by the ultraviolet germicidal lamp 19. The sterilized mud can be collected by the collecting box 8, and the mud pump is installed through the mud pump installation port 9 to facilitate the extraction of the mud and facilitate subsequent secondary filtration and dehydration of the mud. A rubber pad is set between the adjustment plate 20 and the box 1 to improve the sealing of the box 1 and prevent leakage. The first quartz glass plate 17 and the second quartz glass plate 18 can block the mud to avoid affecting the sterilization effect of the ultraviolet germicidal lamp 19 on the mud.

[0026] In this embodiment, an extrusion filtering mechanism is provided at the top of the box body 1, and the extrusion filtering mechanism includes a filter screen 14 and an extrusion plate 15. An inlet 2 is provided on one side of the top of the box body 1. The filter screen 14 is fixedly arranged at an angle below the inlet 2 corresponding to the interior of the box body 1. A bottom baffle 5 is movably provided below the inlet 2 through a hinge. One end of the bottom baffle 5 is fixedly connected to the box body 1 through a fixing bolt. A pull rod 16 is slidingly provided inside the filter screen 14, and an extrusion plate 15 and a limit frame 24 are fixedly provided at both ends of the pull rod 16. The extrusion plate 15 is slidably provided on one side of the filter screen 14 corresponding to the bottom of the inlet 2. The limit frame 24 is in the shape of a "U". A sliding rod is fixedly provided on the inner walls at both ends of the limit frame 24, and the sliding rod is slidably arranged inside the annular groove. One end of the eccentric wheel 12 is movably arranged between the two ends of the limit frame 24. When the rotating rod 11 rotates, the sliding rod can be driven by the action of the eccentric wheel 12 and the annular groove, so that the sliding rod slides inside the annular groove, and the pull rod 16 is driven back and forth to slide laterally inside the filter screen 14 through the sliding rod and the limit frame 24, which makes it convenient for the pull rod 16 to drive the extrusion plate 15 to move back and forth laterally, so as to facilitate the extrusion of the river and lake dredging sludge between the filter screen 14 and the extrusion plate 15, and to facilitate the filtration of larger debris in the river and lake dredging sludge, and discharge the river and lake dredging sludge into the interior of the box body 1, so as to facilitate subsequent mixing and stirring.

[0027] When the dewatering construction method of river and lake dredging sludge is used, mechanical equipment such as excavators or loaders are used to clean the sludge from the bottom of rivers and lakes, and the dredged sludge is transported to the inside of the treatment plant by transportation equipment. The dredged sludge is placed between the extrusion plate 15 and the filter screen 14. A horizontal plate facing the right side is set on the top of the extrusion plate 15 to block the dredged sludge from being discharged between the extrusion plate 15 and the inner wall of the right box 1. The first servo motor 4 is started, and the first servo motor 4 drives the eccentric wheel 12 to rotate through the rotating rod 11. The eccentric wheel 12 drives the limit frame 24 through the action of the annular groove and the slide rod. The pull rod 16 moves back and forth laterally, and the pull rod 16 drives the extrusion plate 15 to move back and forth laterally, so as to squeeze the river and lake dredging sludge toward the filter screen 14. The filter screen 14 filters the larger debris therein, and the river and lake dredging sludge is discharged into the interior of the box body 1 through the filter screen 14. Water is added to the box body 1 through the water inlet 3. The rotating rod 11 mixes the river and lake dredging sludge and water through the stirring blade 13 to form mud; the second servo motor 22 is started, and the second servo motor 22 drives the adjustment plate 20 to slide upward through the screw 23, and the bottom end of the adjustment plate 20 is separated from the discharge port, and the inside of the box body 1 The mud flows along the surface of the second quartz glass plate 18 under its own fluidity and gravity. The first quartz glass plate 17 and the second quartz glass plate 18 can block the mud to prevent it from affecting the sterilization effect of the ultraviolet germicidal lamp 19, and can also assist the mud to flow. The ultraviolet germicidal lamp 19 is used to sterilize the surface and bottom of the mud. The ultraviolet germicidal lamp 19 is a UVC frequency band, which has a higher sterilization efficiency. The ultraviolet germicidal lamp 19 is arranged in an array, which can fully sterilize the mud. The sterilized mud enters the interior of the collection box 8 and is placed at the mud pump installation port 9. A mud pump is installed inside the filter tank to pump out the mud and send it to a filter box or filter pool for secondary filtration to remove smaller particles in the mud. After filtration, another mud pump is used to pump the mud into the mixing pool and add chemical agents such as polymerized alumina to the mud. Finally, it is discharged into a plate and frame filter press for filter pressure filtration. The discharged water is reused or discharged into the river. The formed mud cake is crushed by crushing equipment and then dried by a dryer or drying plant. The drying process can also sterilize the dredged mud from rivers and lakes, thereby improving the drying efficiency of the dredged mud from rivers and lakes.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be included within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0029] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A dewatering construction method for dredging sediment in rivers and lakes, characterized in that: The following steps are involved: S1: Mechanical dredging: Use dredging machinery to dredge the bottom mud of rivers and lakes and excavate the bottom mud; S2: Agitation and water washing: Use agitation and filtration equipment to agitate and filter the bottom mud and add water to form mud; S3: Filtration: Perform secondary filtration to remove small impurities in the mud, and the filtered mud is recovered for later use; S4: Chemical treatment: Add chemicals to the slurry and stir it thoroughly using mixing equipment; S5: Dehydration treatment: Use filter press equipment to filter the mud to remove water from the mud to form a mud cake; S6: Crushing and drying: The bottom mud is crushed and thoroughly dried through crushing equipment and drying equipment.

2. The dewatering construction method for desilting river and lake sediment according to claim 1, characterized in that: The bottom mud excavated in step S1 is directly transported to a bottom mud treatment site, and placed in the stirring and filtering equipment in step S2, where the bottom mud is preliminarily treated.

3. The dewatering construction method for desilting river and lake sediment according to claim 2, characterized in that: The stirring and filtering equipment in step S2 can filter and clean up larger debris in the bottom mud.

4. The dewatering construction method for desilting river and lake sediment according to claim 3, characterized in that: The chemical agent used in step S4 is a polymerized alumina flocculant. The slurry after adding the chemical agent is passed into the filter press equipment in step S5. The filter press equipment in step S5 is a plate and frame filter press.

5. The dewatering construction method for desilting river and lake sediment according to claim 1, characterized in that: The stirring and filtering equipment in step S2 comprises a box (1), a bottom plate (6) is fixedly provided at the bottom of the box (1), a stirring mechanism is provided inside the box (1) through a first servo motor (4), the stirring mechanism comprises a rotating rod (11) and an eccentric wheel (12), the first servo motor (4) is fixedly provided at the top of the box (1), a sterilizing mechanism is provided at one end of the bottom plate (6) corresponding to one side of the box (1), the rotating rod (11) is rotatably mounted inside the box (1), stirring blades (13) are fixedly provided on both sides of the bottom end of the rotating rod (11), the eccentric wheel (12) is fixedly provided at the top of the rotating rod (11), the rotating rod (11) is fixedly provided at the bottom end of the output shaft of the first servo motor (4), annular grooves are provided at the top and bottom of the eccentric wheel (12), and a water inlet (3) is provided at the top of the box (1) corresponding to one side of the first servo motor (4).

6. The dewatering construction method for river and lake dredging sediment according to claim 5, characterized in that: The sterilization mechanism includes a sterilization box (7) and an ultraviolet sterilization lamp (19). The sterilization box (7) is fixedly arranged at the bottom end of the box body (1) and one side of the bottom plate (6). The ultraviolet sterilization lamp (19) is fixedly arranged in a matrix-symmetrical manner inside the sterilization box (7). A first quartz glass plate (17) and a second quartz glass plate (18) are fixedly arranged between the ultraviolet sterilization lamps (19) at the top and bottom, respectively.

7. The dewatering method for river and lake dredging sediment according to claim 6, characterized in that: A collecting box (8) is fixedly provided at one end of the sterilizing box (7), a slurry pump installation port (9) is provided on the top of the collecting box (8), the sterilizing box (7) and the collecting box (8) are communicated with each other, a discharge port is provided at the bottom end of the box body (1) at a position corresponding to the sterilizing box (7), the discharge port is communicated with the sterilizing box (7), and a lifting mechanism (10) is provided at the discharge port.

8. The dewatering method for river and lake dredging sediment according to claim 7, characterized in that: The lifting mechanism (10) includes an adjusting plate (20), the cross-sectional shape of the adjusting plate (20) is "T"-shaped, one end of the adjusting plate (20) is slidably arranged on the outer wall of the box body (1), a fixing block (21) is fixedly arranged on the top of one end of the adjusting plate (20), a second servo motor (22) is fixedly arranged on the top of the fixing block (21), a screw (23) is fixedly arranged on the output shaft of the second servo motor (22), the adjusting screw (23) is screwed and installed inside one end of the adjusting plate (20), and the bottom end of the adjusting plate (20) is blocked inside the discharge port.

9. The dewatering method for river and lake dredging sediment according to claim 5, characterized in that: The top of the box (1) is provided with an extrusion filter mechanism, which includes a filter screen (14) and an extrusion plate (15). An inlet (2) is provided on one side of the top of the box (1). The filter screen (14) is fixedly arranged below the inlet (2) and corresponds to the interior of the box (1). A bottom baffle (5) is movably arranged below the inlet (2) via a hinge, and one end of the bottom baffle (5) is fixedly connected to the box (1) via a fixing bolt.

10. A dewatering construction method for river and lake dredging sediment according to claim 9, characterized in that: A pull rod (16) is slidably provided inside the filter (14), and an extrusion plate (15) and a limit frame (24) are fixedly provided at both ends of the pull rod (16). The extrusion plate (15) is slidably provided on one side of the filter (14) below the corresponding inlet (2). The limit frame (24) is in the shape of a "U". Slide rods are fixedly provided on the inner walls at both ends of the limit frame (24). The slide rods are slidably provided inside the annular groove. One end of the eccentric wheel (12) is movably provided between the two ends of the limit frame (24).

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