CN112211210A

CN112211210A - Underwater fixing method of sandbag cofferdam

Info

Publication number: CN112211210A
Application number: CN202011119262.1A
Authority: CN
Inventors: 叶国忠
Original assignee: Huzhou Santong Water Conservancy Construction Co ltd
Current assignee: Huzhou Santong Water Conservancy Construction Co ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2021-01-12
Anticipated expiration: 2040-10-19
Also published as: CN112211210B

Abstract

The utility model relates to a method for fixing sand inclusion cofferdam under water, it is concrete including following steps, insert two rows of every row of several location steel pipes in the riverbed, place the sand bag of treating the hydraulic reclamation between two rows of location steel pipes, then correspond the location steel pipe with the steel ring of making up in the sand bag side and cup joint, move the riverbed of the below of sand bag with sand bag positioning device through the transport ship, place the rubble bag toward on the sand bag, make the sand bag sink, the mud pipe that will blow the sand ship and the filling cuff of sand bag carry out the ligature fixed, send into the silt of riverbed bottom in the sand bag, the effect that the sand bag is difficult for taking place the skew has.

Description

Underwater fixing method of sandbag cofferdam

Technical Field

The application relates to the technical field of sand inclusion cofferdams, in particular to an underwater fixing method of a sand inclusion cofferdam.

Background

When underwater buildings need to be overhauled, a temporary cofferdam needs to be built at the overhaul position, then water in the temporary cofferdam is discharged, so that workers can conveniently operate, the sandbag cofferdam has better reusability, and meanwhile, the installation and the dismantling are convenient, the construction speed is high, and the method is suitable for the characteristic of the temporary cofferdam.

The existing large-scale sand bag cofferdam is generally carried out by adopting sand bags with the length of tens of meters, then silt is filled into the sand bags by a sand blowing boat, then a plurality of sand bags are stacked in the vertical direction, the surface area of the sand bag at the bottommost is largest, and after the sand bags are stacked, block stones are stacked on the surfaces of the sand bags for protection.

In view of the above-mentioned related technologies, the applicant believes that before the first sandbags are submerged into the water bottom, a plurality of positioning steel pipes are uniformly inserted into both sides of the width direction of the predetermined position along the length direction of the sandbags, then the sandbags are submerged into the water bottom through the stone block bags, and then the sandbags are blown and filled, so that the sandbags are affected by the action of wind, waves and water flows, so that the positioning steel pipes are easy to incline, and the sandbags are easy to shift to the predetermined positions.

Disclosure of Invention

In order to improve the stability of the initial sand bags under water, the underwater fixing method of the sand-covered cofferdam is provided.

The underwater fixing method for the sand inclusion cofferdam adopts the following technical scheme:

an underwater fixing method of a sandbag cofferdam specifically comprises the following steps:

the method comprises the following steps: inserting two rows of positioning steel pipes with a plurality of rows into the riverbed;

step two: placing a sandbag to be filled between the two rows of positioning steel pipes, and then sleeving the positioning steel pipes corresponding to the steel rings sewn on the side edges of the sandbag;

step three: moving the sandbag positioning equipment to a riverbed below the sandbag through a transport ship, wherein a plurality of sandbag positioning equipment can be uniformly placed along the length direction of the sandbag;

step four: placing a gravel bag on the sandbag to enable the sandbag to sink, binding and fixing a mud conveying pipe of the sand blowing boat and a filling cuff of the sandbag, and conveying silt at the bottom of a river bed into the sandbag;

wherein, sand bag positioning device is including dismantling the ship connecting plate of connecting in the transport ship, locate the movable baffle that the ship connecting plate deviates from transport ship one side, locate the movable plate mobile device that the ship connecting plate just made movable baffle can remove in the certain limit, fixed connection is in the riverbed bottom plate of ship connecting plate bottom, locate the rotation baffle that the riverbed bottom plate keeps away from ship connecting plate one side, locate the riverbed bottom plate and drive rotation baffle around self bottom pivoted baffle rotating device, locate riverbed bottom plate lower surface and can peg graft in the fixed inserted bar of riverbed, locate the riverbed bottom plate and can drive the inserted bar drive arrangement that fixed inserted bar inserted or broke away from the riverbed, the inserted bar groove that supplies the inseparable gliding inserted bar of fixed inserted bar is seted up to riverbed bottom plate lower surface.

Through adopting above-mentioned technical scheme, fixed inserted bar inserts to the riverbed and makes the difficult emergence of riverbed bottom plate remove, and simultaneously, the location steel pipe inclines easily when receiving the horizontal effort of sand bag, and the riverbed bottom plate has great area to make the difficult slope of fixed inserted bar, further promotes the stability of sand bag when filling under water to the horizontal width receives certain restriction when removal baffle and rotating the baffle make the sand bag fill.

Preferably, the inserted bar driving device comprises a driving screw cylinder which is rotatably connected inside the riverbed bottom plate and is in threaded connection with the fixed inserted bar, a screw cylinder gear which is coaxially and fixedly connected with the outer wall of the driving screw cylinder, an inserted bar motor which is arranged in the riverbed bottom plate, a motor gear which is coaxially and fixedly connected with an output shaft of the inserted bar motor and is meshed with the screw cylinder gear, and an inserted bar positioning mechanism which is arranged inside the riverbed bottom plate and enables the fixed inserted bar not to rotate along with the rotation of the driving screw cylinder.

Through adopting above-mentioned technical scheme, the inserted bar motor starts, and the meshing of accessible motor gear and spiral shell section of thick bamboo gear makes to drive the spiral shell section of thick bamboo and rotates in the lump, makes fixed inserted bar rotate in the lump then, drives fixed inserted bar then and can insert or break away from the riverbed to fix or remove the riverbed bottom plate.

Preferably, the inserted bar positioning mechanism comprises an anti-rotation bar arranged inside the riverbed bottom plate, the upper surface of the fixed inserted bar is provided with an anti-rotation groove along the length direction, and the anti-rotation bar is connected to the anti-rotation groove along the length direction in a sliding manner.

Through adopting above-mentioned technical scheme, prevent changeing the pole and can only follow self length direction sliding connection in preventing changeing the groove, then make the drive barrel can not make fixed inserted bar rotate in the lump at the pivoted in-process to fixed inserted bar can not remove along self length direction effectively.

Preferably, the sealing groove is formed in the circumferential inner wall of the plug rod groove along the axis direction, and sealing rubber rings are arranged on the inner walls of two ends of the sealing groove.

Through adopting above-mentioned technical scheme, two sealing rubber circles make the leakproofness between fixed inserted bar and the inserted bar groove obtain better promotion.

Preferably, the fixed inserted link is fixedly connected with an inserted link disc located in the sealing groove, and the inserted link disc is slidably connected to the inner wall of the sealing groove.

Through adopting above-mentioned technical scheme, the inserted bar disk butt when two sealing rubber circle, fixed inserted bar can't remove for it can not rotate excessively to drive the spiral shell section of thick bamboo, and makes fixed inserted bar break away from and can cause too big pressure in the inner wall that drives the spiral shell section of thick bamboo or fixed inserted bar to the riverbed bottom plate.

Preferably, the upper surface and the lower surface of the riverbed bottom plate are both provided with nylon plates.

Through adopting above-mentioned technical scheme for when shifting out the riverbed bottom plate after the sand bag fills and finishes, can both obtain reducing in the matcha between the upper surface of riverbed bottom plate and the sand bag and between riverbed bottom plate lower surface and the riverbed, make the riverbed bottom plate can be shifted out more easily then.

Preferably, the upper surface of the riverbed bottom plate is provided with a baffle groove for the rotating baffle to enter in a rotating mode, and the baffle rotating device comprises a rotating shaft gear fixedly connected to the rotating baffle and rotatably connected to the inner portion of the riverbed bottom plate and a rotating shaft gear driving mechanism arranged on the riverbed bottom plate and driving the rotating shaft gear to rotate.

Through adopting above-mentioned technical scheme, when rotating the baffle and putting at ordinary times, rotating the baffle and can not outstanding in the upper surface of riverbed bottom plate, make the riverbed bottom plate more smooth and easy when shifting out from the sand bag below that finishes filling then.

Preferably, the rotating shaft gear driving mechanism comprises a driving gear coaxially and fixedly connected to the motor gear, an upper gear meshed with the driving gear and rotatably connected to the inside of the riverbed bottom plate, a horizontal bevel gear coaxially and fixedly connected to the upper gear, a vertical bevel gear meshed with the horizontal bevel gear and rotatably connected to the inside of the riverbed bottom plate, two synchronous sheaves rotatably connected to the inside of the riverbed bottom plate, a synchronous belt in transmission connection between the two synchronous sheaves, and a transmission gear coaxially and fixedly connected to the synchronous sheaves close to the rotating shaft gear, wherein the transmission gear is meshed with the rotating shaft gear, and the synchronous sheaves far away from the transmission gear are coaxially and fixedly connected to the vertical.

Through adopting above-mentioned technical scheme for when the inserted bar motor drives fixed inserted bar and breaks away from the riverbed, also can drive the rotation baffle in step and rotate and set level, make the working process of rotation baffle need not additionally set up the power supply.

Preferably, the moving plate moving device comprises a vertical moving plate which is connected with the ship connecting plate in a sliding mode in the vertical direction, a guide wheel which is connected with the upper end of the ship connecting plate in a rotating mode, a steel cable which is connected with the guide wheel in a transmission mode and drives the vertical moving plate to move in the vertical direction, and a moving baffle horizontal moving mechanism which is arranged on the vertical moving plate and drives the moving baffle to move in the horizontal direction.

Through adopting above-mentioned technical scheme, the steel cable drives and erects the board and remove along vertical direction, makes the interval between riverbed bottom plate and the riverbed obtain the change then to collision appears easily between riverbed bottom plate and the riverbed in the transport ship removal process.

Preferably, the horizontal moving mechanism of the movable baffle comprises a guide rod fixedly connected with the vertical moving plate, a threaded rod rotatably connected with the vertical moving plate, a translation block sleeved on the guide rod, a threaded rod motor arranged on the vertical moving plate and having an output shaft coaxially and fixedly connected with the threaded rod, the threaded rod is in threaded connection with the translation block, and the translation block is fixedly connected with the movable baffle.

Through adopting above-mentioned technical scheme for when making the transport ship be close to the sand bag, need not control the horizontal interval between riverbed bottom plate and the sand bag by the transport ship again, so that the position of better control riverbed bottom plate makes the final position of sand bag be close to more in expected position.

In summary, the present application includes at least one of the following beneficial technical effects:

the fixed inserted rod is inserted into the river bed, so that a bottom plate of the river bed is not easy to move, meanwhile, the positioning steel pipe is easy to incline when being subjected to the horizontal acting force of the sand bag, the fixed inserted rod is not easy to incline due to the large area of the bottom plate of the river bed, the stability of the sand bag during underwater filling is further improved, and the horizontal width of the sand bag during filling is limited by the movable baffle and the rotary baffle;

when the transport ship is close to the sandbags, the horizontal distance between the riverbed bottom plate and the sandbags does not need to be controlled by the transport ship any more, so that the position of the riverbed bottom plate is better controlled, and the final positions of the sandbags are closer to the expected positions.

Drawings

FIG. 1 is a schematic diagram of the main structure of the present application;

FIG. 2 is a schematic bottom view of the bottom plate and the vertical moving plate of the riverbed;

FIG. 3 is a schematic partial sectional view of a bottom plate of a river bed for showing the internal structure of an inner groove, a plug rod groove, a sealing groove and a gear groove of a rotating shaft of the bottom plate;

FIG. 4 is an enlarged schematic view at A in FIG. 3;

fig. 5 is an enlarged schematic view at B in fig. 3.

In the figure, 1, a ship connecting plate; 11. a threaded rod; 12. a translation block; 13. a threaded rod motor; 14. a wedge-shaped groove; 15. a wedge block; 16. an inner groove of the bottom plate; 17. a rotating shaft gear groove; 18. a transmission gear; 2. a riverbed bottom plate; 21. a lever stopper; 22. a vertical bevel gear; 23. a synchronous sheave; 24. a synchronous belt; 25. moving the baffle; 26. vertically moving the plate; 27. a guide wheel; 28. a steel cable; 29. a guide bar; 3. rotating the baffle; 31. an anti-rotation slot; 32. inserting a rod wafer; 33. an oilnylon plate; 34. a baffle slot; 35. a spindle gear; 37. a driving gear; 38. an upper gear; 39. a horizontal bevel gear; 4. fixing the inserted rod; 42. driving the screw cylinder; 43. a barrel gear; 44. a plunger motor; 45. a motor gear; 46. a plug-in rod slot; 47. a sealing groove; 48. sealing the rubber ring; 49. prevent the bull stick.

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings.

The embodiment of the application discloses an underwater fixing method of a sandbag cofferdam, which specifically comprises the following steps with reference to fig. 1 and 2:

wherein, the sandbag positioning device comprises a ship connecting plate 1 detachably connected with a transport ship through bolts, the ship connecting plate 1 is vertical, one side of the ship connecting plate 1, which is far away from the transport ship, is provided with a movable baffle 25, the movable baffle 25 is parallel to the ship connecting plate 1, the ship connecting plate 1 is provided with a movable plate moving device which can drive the movable baffle 25 to move along the vertical and horizontal directions, the bottom end of the side of the movable baffle 25, which is far away from the ship connecting plate 1, is fixedly connected with a riverbed bottom plate 2, the length direction of the riverbed bottom plate 2 is parallel to the length direction of the transport ship body, the upper surface of the riverbed bottom plate 2, which is far away from the movable baffle 25, is provided with a baffle groove 34, the length direction of the baffle groove 34 is parallel to the length direction of the riverbed bottom plate 2, the inner wall of one end, which is close to the movable baffle 25, is rotatably connected with a rotating baffle 3, riverbed bottom plate 2 is installed and is driven rotation baffle 3 around self rotation axis pivoted baffle rotating device, two inserted bar grooves 46 have been seted up along vertical direction to 2 lower surfaces of riverbed bottom plate, two inserted bar grooves 46 are evenly arranged along 2 length direction of riverbed bottom plate, two inserted bar grooves 46 all have a fixed inserted bar 4 along the inseparable sliding connection of vertical direction, 4 horizontal cross-sections of fixed inserted bar are circular, 4 bottom ends of fixed inserted bar are coniform, riverbed bottom plate 2 is installed and to be driven fixed inserted bar 4 and insert or break away from the inserted bar drive arrangement of riverbed, riverbed bottom plate 2 upper surface and the equal fixedly connected with oily nylon plate 33 of lower surface.

Referring to fig. 1 and 2, the moving plate moving device includes a vertical moving plate 26 attached to a side surface of the ship connecting plate 1 facing the moving baffle 25, the vertical moving plate 26 is L-shaped, a vertical wedge-shaped groove 14 is formed in an outer wall of the ship connecting plate 1 along a vertical direction, the wedge-shaped groove 14 is connected with a wedge-shaped block 15 in a sliding manner along the vertical direction, a portion of the wedge-shaped block 15 exposed out of the wedge-shaped groove 14 is fixedly connected to the vertical moving plate 26, an upper end of the ship connecting plate 1 is rotatably connected with a guide wheel 27, the guide wheel 27 is connected with a steel cable 28 in a transmission manner, one end of the steel cable 28 is fixedly connected to an upper end of the vertical moving plate 26, the other end of the steel cable 28 can be driven by a winch on a transport ship to perform transmission, a portion of the steel cable 28 located right above the vertical moving plate 26 is vertical, so that the steel cable 28 can smoothly drive the vertical moving plate, the horizontal moving mechanism of the moving baffle comprises a threaded rod 11 which is rotatably connected to the side surface of a vertical section of a vertical moving plate 26 back to a ship connecting plate 1, the length direction of the threaded rod 11 is perpendicular to the vertical section of the vertical moving plate 26 and faces the vertical side surface of the ship connecting plate 1, the side surface of the vertical section of the vertical moving plate 26 facing the ship connecting plate 1 is fixedly connected with a threaded rod motor 13 of which the output shaft is coaxially and fixedly connected to the threaded rod 11, the threaded rod 11 is in threaded connection with a horizontal translation block 12, the side surface of the vertical moving plate 26, which is provided with the threaded rod 11, is fixedly connected with two guide rods 29, the length direction of the guide rods 29 is parallel to the length direction of the threaded rod 11, the threaded rod 11 is positioned between the two guide rods 29, the two guide rods 29 are respectively arranged at two ends of the translation block 12, one end of each guide rod 29, which is, the lower part of the translation block 12 is fixedly connected to the upper part of the movable baffle 25.

Referring to fig. 3 and 4, a bottom plate inner groove 16 is formed in the riverbed bottom plate 2, the inserted link driving device comprises two vertical driving screw cylinders 42 rotatably connected between two horizontal inner walls of the bottom plate inner groove 16, the two driving screw cylinders 42 are respectively in threaded connection with two fixed inserted links 4, an inserted link positioning mechanism is installed in the bottom plate inner groove 16, the fixed inserted links 4 cannot rotate along with the rotation of the driving screw cylinders 42, the inserted link positioning mechanism comprises two rotation preventing rods 49 fixedly connected to the horizontal inner walls of the upper part of the bottom plate inner groove 16, the upper end surfaces of the two fixed inserted links 4 are respectively provided with an anti-rotation groove 31 along the self axis direction, the horizontal cross sections of the anti-rotation rods 49 and the anti-rotation grooves 31 are rectangular, the anti-rotation rods 49 can only be slidably connected to the anti-rotation grooves 31 along the self length direction, the anti-rotation rods 49 are always positioned in the anti-rotation grooves 31, the circumferential outer walls of the, the inner groove 16 of the bottom plate is fixedly connected with an inserted link motor 44, an output shaft of the inserted link motor 44 is coaxially and fixedly connected with a motor gear 45, and the motor gear 45 is meshed with the two spiral cylinder gears 43.

Referring to fig. 3 and 5, a sealing groove 47 has been coaxially provided on the inner wall of the circumference of two insertion rod grooves 46, a sealing rubber ring 48 is adhered to the inner wall of each end of the axis of the sealing groove 47, the outer wall of the circumference of the fixed insertion rod 4 is hermetically and slidably connected to the side surface of the inner ring of the sealing rubber ring 48, the outer wall of the circumference of the fixed insertion rod 4 is coaxially and fixedly connected with the insertion rod wafer 32 located in the sealing groove 47, the insertion rod wafer 32 is slidably connected to the inner wall of the circumference of the sealing groove 47 along the vertical direction, and the space is reserved between the upper end of the fixed insertion rod 4 and the inner upper surface and the inner lower surface of the bottom plate inner.

Referring to fig. 3 and 4, the baffle rotating device comprises a rotating shaft gear 35 fixedly connected to one end of the rotating baffle 3 positioned in a baffle groove 34, a rotating shaft gear groove 17 is formed in the upper horizontal inner wall of a bottom plate inner groove 16, the rotating shaft gear 35 is positioned in the rotating shaft gear groove 17, the bottom plate inner groove 16 is provided with a rotating shaft gear driving mechanism for driving the rotating shaft gear 35 to rotate, the rotating shaft gear driving mechanism comprises two synchronous sheaves 23 rotatably connected in the vertical inner wall of the bottom plate inner groove 16, a synchronous belt 24 is connected between the two synchronous sheaves 23 in a transmission manner, the synchronous sheave 23 close to the rotating shaft gear 35 is higher and is coaxially and fixedly connected with a transmission gear 18, the transmission gear 18 is meshed with the rotating shaft gear 35, the synchronous sheave 23 far away from the rotating shaft gear 35 is coaxially and fixedly connected with a vertical bevel gear 22, the vertical inner groove 22 is, an upper gear 38 is coaxially and fixedly connected to the upper portion of the horizontal bevel gear 39, a driving gear 37 coaxially and fixedly connected to a motor gear 45 is meshed with the upper gear 38, and the driving gear 37 is located above the motor gear 45.

The implementation principle of the underwater fixing method of the sandbag cofferdam in the embodiment of the application is as follows: the transport ship will move to the sand bag vicinity, then emit the steel cable 28, make and erect board 26 and descend, also can start threaded rod motor 13 simultaneously, make translation piece 12 move along the length direction of riverbed bottom plate 2, make riverbed bottom plate 2 move to the suitable position department of sand bag below, then start inserted bar motor 44, make fixed inserted bar 4 insert in the riverbed, inserted bar motor 44 also can indirectly drive rotating baffle 3 simultaneously and change into vertical state by the horizontal state, then fill the sand bag, the sand bag is filled the back, start inserted bar motor 44 again, make fixed inserted bar 4 break away from the riverbed and rotating baffle 3 has vertical state to change into horizontal state, then the transport ship takes riverbed bottom plate 2 out from the sand bag below.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An underwater fixing method of a sand inclusion cofferdam is characterized in that: the method specifically comprises the following steps:

wherein the sandbag positioning device comprises a ship connecting plate (1) detachably connected with the transport ship, a movable baffle (25) arranged on one side of the ship connecting plate (1) departing from the transport ship, a movable plate moving device arranged on the ship connecting plate (1) and enabling the movable baffle (25) to move in a certain range, and a riverbed bottom plate (2) fixedly connected with the bottom of the ship connecting plate (1), locate riverbed bottom plate (2) and keep away from rotating damper (3) of ship connecting plate (1) one side, locate riverbed bottom plate (2) and drive rotating damper (3) around self bottom pivoted baffle rotating device, locate riverbed bottom plate (2) lower surface and can peg graft in fixed inserted bar (4) of riverbed, locate riverbed bottom plate (2) and can drive fixed inserted bar (4) and insert or break away from the inserted bar drive arrangement of riverbed, riverbed bottom plate (2) lower surface is seted up and is supplied fixed inserted bar (4) inseparable gliding inserted bar groove (46).

2. The underwater fixing method of the sand-covered cofferdam of claim 1, wherein: the inserted bar driving device comprises a driving screw cylinder (42) which is rotatably connected to the inner part of the riverbed bottom plate (2) and is in threaded connection with the fixed inserted bar (4), a screw cylinder gear (43) which is coaxially and fixedly connected to the outer wall of the driving screw cylinder (42), an inserted bar motor (44) which is arranged in the riverbed bottom plate (2), a coaxial and fixedly connected to an output shaft of the inserted bar motor (44) and is meshed with a motor gear (45) of the screw cylinder gear (43), and an inserted bar positioning mechanism which is arranged in the riverbed bottom plate (2) and enables the fixed inserted bar (4) not to rotate along with the rotation of the driving screw cylinder (42).

3. The underwater fixing method of the sand-covered cofferdam of claim 2, wherein: the inserted bar positioning mechanism comprises an anti-rotation rod (49) arranged inside a riverbed bottom plate (2), an anti-rotation groove (31) is formed in the upper surface of the fixed inserted bar (4) along the length direction of the fixed inserted bar, and the anti-rotation rod (49) is connected to the anti-rotation groove (31) in a sliding mode along the length direction of the fixed inserted bar.

4. The underwater fixing method of the sand-covered cofferdam of claim 1, wherein: a sealing groove (47) is formed in the circumferential inner wall of the plug rod groove (46) along the axis direction of the plug rod groove, and sealing rubber rings (48) are arranged on the inner walls of two ends of the sealing groove (47).

5. The underwater fixing method of the sand-covered cofferdam of claim 4, wherein: the fixed inserted bar (4) is fixedly connected with an inserted bar wafer (32) positioned in the sealing groove (47), and the inserted bar wafer (32) is connected to the inner wall of the sealing groove (47) in a sliding manner.

6. The underwater fixing method of the sand-covered cofferdam of claim 1, wherein: the upper surface and the lower surface of the riverbed bottom plate (2) are both provided with an oily nylon plate (33).

7. The underwater fixing method of the sand-covered cofferdam of claim 1, wherein: the upper surface of the riverbed bottom plate (2) is provided with a baffle groove (34) for the rotating baffle (3) to rotate and enter, and the baffle rotating device comprises a rotating shaft gear (35) which is fixedly connected to the rotating baffle (3) and is rotatably connected to the inside of the riverbed bottom plate (2) and a rotating shaft gear driving mechanism which is arranged on the riverbed bottom plate (2) and drives the rotating shaft gear (35) to rotate.

8. The underwater fixing method of the sand-covered cofferdam of claim 7, wherein: the rotating shaft gear driving mechanism comprises a driving gear (37) coaxially and fixedly connected with a motor gear (45), an upper gear (38) meshed with the driving gear (37) and rotatably connected inside the riverbed bottom plate (2), a horizontal bevel gear (39) coaxially and fixedly connected with the upper gear (38), a vertical bevel gear (22) meshed with the horizontal bevel gear (39) and rotatably connected inside the riverbed bottom plate (2), two synchronous sheaves (23) rotatably connected inside the riverbed bottom plate (2), a synchronous belt (24) in transmission connection between the two synchronous sheaves (23), and a transmission gear (18) coaxially and fixedly connected with the synchronous sheaves (23) close to the rotating shaft gear (35), the transmission gear (18) is meshed with the rotating shaft gear (35), and a synchronous sheave (23) far away from the transmission gear (18) is coaxially and fixedly connected to the vertical bevel gear (22).

9. The underwater fixing method of the sand-covered cofferdam of claim 1, wherein: the moving plate moving device comprises a vertical moving plate (26) which is connected to the ship connecting plate (1) in a sliding mode in the vertical direction, a guide wheel (27) which is connected to the upper end of the ship connecting plate (1) in a rotating mode, a steel cable (28) which is connected to the guide wheel (27) in a transmission mode and drives the vertical moving plate (26) to move in the vertical direction, and a moving baffle horizontal moving mechanism which is arranged on the vertical moving plate (26) and drives the moving baffle (25) to move in the horizontal direction.

10. The underwater fixing method of the sand-covered cofferdam of claim 9, wherein: the horizontal moving mechanism of the movable baffle comprises a guide rod (29) fixedly connected to a vertical moving plate (26), a threaded rod (11) rotatably connected to the vertical moving plate (26), a translation block (12) sleeved on the guide rod (29), and a threaded rod motor (13) arranged on the vertical moving plate (26) and coaxially and fixedly connected to an output shaft of the threaded rod (11), wherein the threaded rod (11) is in threaded connection with the translation block (12), and the translation block (12) is fixedly connected to the movable baffle (25).