JP2012101580A - Maintenance method of marine propulsion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a maintenance method of a marine propulsion apparatus which is capable of carrying out the maintenance of the marine propulsion apparatus regardless of weather and marine meteorology and does not require a large device for moving the propulsion apparatus.SOLUTION: The propulsion apparatus 30 is moved from an action position where the propulsion apparatus 30 generates thrust to a position 11 above a waterline in a hull 10 using a longitudinal hole 20 in the hull 10 and maintenance is carried out. The hull 10 includes a sealed flange 22 formed to partially close the longitudinal hole 20 at a position lower than the waterline. The propulsion apparatus 30 includes a propulsion apparatus body 31 and a drive device 35 arranged at the upper side of the propulsion apparatus body 31. The propulsion apparatus body 31 includes a sealed part 32 pressed downwardly to the sealed flange 22 to water-tightly close the longitudinal hole 20 and a thrust generating part 34 arranged at the lower side of the sealed part 32. When the propulsion apparatus 30 is moved, the propulsion apparatus body 31 and the drive device 35 are separately moved.

Description

  The present invention relates to the maintenance of propulsion devices such as marine thrusters.

  Patent document 1 is disclosing the propulsion apparatus of the ship which can retract a propulsion propeller inside the surface of the ship bottom in a shaft. When the propeller is retracted, a plate placed under the propeller seals the shaft. By draining from the shaft, the inspection worker can approach the propeller.

  Patent Document 2 discloses a technique for moving within a shaft a frame in which a propulsion device, its drive motor, a gear mechanism, and a rotary drive unit are connected using a rack and pinion mechanism in order to perform maintenance or inspection of the propulsion device. Is disclosed.

  Patent Document 3 discloses a seal structure for reliably preventing water from entering a shim provided on a joint surface between a gear case of a propeller portion of an azimuth thruster and a bearing housing. The propeller part of the azimuth thruster can turn 360 degrees. When the azimuth thruster is adopted, the motion performance of the ship is very high compared to the propeller of the line shaft type.

JP-A-6-316289 Japanese translation of PCT publication No. 2002-544028 Japanese Patent No. 4361535

  An object of the present invention is to carry out maintenance of a propulsion device on the ocean regardless of the weather and sea conditions, and to maintain a propulsion device on the ocean that does not require a large-sized device to move the propulsion device. Is to provide.

  The means for solving the problem will be described below using the numbers used in the (DETAILED DESCRIPTION). These numbers are added to clarify the correspondence between the description of (Claims) and (Mode for Carrying Out the Invention). However, these numbers should not be used to interpret the technical scope of the invention described in (Claims).

  The offshore propulsion device maintenance method according to the present invention uses a vertical hole (20, 120) extending across the height of the waterline in the hull (10) from an operating position where the propulsion device (30, 130) generates thrust. Moving the propulsion device to a position (11) above the waterline in the hull, and performing maintenance of the propulsion device. The hull includes a sealing flange portion (22, 122) formed to partially close the vertical hole at a position lower than the water line. The propulsion device includes a propulsion device body (31, 131) and a drive device (35, 135) disposed on the upper side of the propulsion device body when the propulsion device is in the operating position. The propulsion device body includes a sealing portion (32, 132) that is pressed downward against the sealing flange portion when the propulsion device is in the operating position to close the vertical hole in a watertight manner, and the propulsion device is in the operating position. And a thrust generation section (34, 134) disposed below the sealing section. In the step of moving the propulsion device, the propulsion device main body and the drive device are moved separately.

  The step of moving the propulsion device includes a step of pressing the propulsion device body so as not to lift using a bar or pipe (53), and a male screw portion protruding upward from the sealing flange portion using a fastening device (60). (41) and removing the nut (42) that presses the sealing portion against the sealing flange portion. The fastening device includes a first air chuck (70) for gripping the nut, a first cylinder (66) provided with the first air chuck, and the nut of the male screw portion inserted into the first cylinder. An engagement portion (64) that engages with the upper portion and a hydraulic cylinder (63) that pulls the engagement portion are provided.

  The propulsion device body includes a guide pipe (33) protruding upward from the sealing portion. The step of removing the nut includes a step of inserting the first cylinder into the guide pipe.

  The male screw portion is a stud bolt (41). The offshore propulsion device maintenance method further includes the step of removing the implanted bolt from the sealed flange portion using the implanted bolt attaching / detaching device (75). The implantation bolt attaching / detaching device includes a second air chuck (80) for gripping the implantation bolt and a second cylinder (76) provided with the second air chuck.

  The step of moving the propulsion device includes a step of removing a pressing rod (153) that presses the sealing portion against the sealing flange portion from a pressing rod support portion (151) disposed above the vertical hole; Removing the portion from the position above the vertical hole. The threaded portion of the presser bar and the threaded portion of the presser bar support part engage so that the presser bar moves up and down when the presser bar rotates.

  The hull includes a casing (22) provided around the vertical hole. A rack (24) is provided in the casing. The propulsion device body includes a gear drive lowering device (36) that kicks the rack with a pinion and presses the sealing portion against the sealing flange portion. The step of moving the propulsion device includes the step of releasing the meshing between the pinion and the rack by the gear drive lowering device.

  The offshore propulsion device maintenance method according to the present invention includes a step of performing maintenance of the propulsion device (30, 130) and a vertical hole (20, 120) extending across the height of the waterline in the hull. Moving the propulsion device from a position (11) higher than the water line to an operating position where the propulsion device generates thrust. The hull includes a sealing flange portion (22, 122) formed to partially close the vertical hole at a position lower than the water line. The propulsion device includes a propulsion device body (31, 131) and a drive device (35, 135) disposed on the upper side of the propulsion device body when the propulsion device is in the operating position. The propulsion device body includes a sealing portion (32, 132) that is pressed downward against the sealing flange portion when the propulsion device is in the operating position to close the vertical hole in a watertight manner, and the propulsion device is in the operating position. And a thrust generation section (34, 134) disposed below the sealing section. In the step of moving the propulsion device, the propulsion device main body and the drive device are moved separately.

  According to the present invention, it is possible to perform maintenance of the propulsion device on the ocean regardless of the weather and sea conditions, and a maintenance method for the propulsion device on the ocean that does not require a large-sized device to move the propulsion device. Is provided.

FIG. 1 is a side view of the vicinity of a propulsion device for a floating structure according to a first embodiment of the present invention. FIG. 2 is a plan view of the propulsion device according to the first embodiment. FIG. 3 shows a fastening structure of the propulsion device according to the first embodiment. FIG. 4 shows a step of removing and moving the driving device of the propulsion device in the propulsion device maintenance method according to the first embodiment. FIG. 5 shows a step of pressing the propulsion device main body in the propulsion device maintenance method according to the first embodiment. FIG. 6 is a plan view of the pushing device used in the step of pressing the propulsion device body. FIG. 7 shows a schematic configuration of the fastening device used in the step of removing the nut. FIG. 8 shows a step of moving the propulsion device body from the operating position to the maintenance place in the propulsion device maintenance method according to the first embodiment. FIG. 9 shows a step of removing the stud in the maintenance method for the propulsion device according to the first embodiment. FIG. 10 shows a step of draining the vertical hole in the maintenance method for the propulsion device according to the first embodiment. FIG. 11 shows a modified example of the step of draining the vertical hole in the maintenance method for the propulsion device according to the first embodiment. FIG. 12 is a side view of the vicinity of the propulsion device for a floating structure according to the second embodiment of the present invention. FIG. 13 is a plan view of the propulsion device according to the second embodiment. FIG. 14 shows a step of moving the propulsion device main body from the operating position to the maintenance place in the propulsion device maintenance method according to the second embodiment. FIG. 15 shows a step of returning the propulsion device main body to the operating position in the propulsion device maintenance method according to the second embodiment. FIG. 16 is a side view of the vicinity of the propulsion device for a floating structure according to the third embodiment of the present invention. FIG. 17 is a plan view of the vicinity of a vertical hole according to the third embodiment. FIG. 18 shows a step of removing and moving the drive unit of the propulsion device in the propulsion device maintenance method according to the third embodiment. FIG. 19 shows a step of removing the pressing bar of the pushing device in the maintenance method for the propulsion device according to the third embodiment. FIG. 20 shows a step of removing the pressing bar support portion of the pushing device in the propulsion device maintenance method according to the third embodiment. FIG. 21 shows steps of moving the propulsion device body from the operating position to the maintenance table in the propulsion device maintenance method according to the third embodiment. FIG. 22 shows the steps of draining the vertical holes in the propulsion device maintenance method according to the third embodiment. FIG. 23 shows a modification of the pushing device according to the third embodiment.

  A mode for carrying out a maintenance method for an offshore propulsion device according to the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
A floating structure according to a first embodiment of the present invention will be described with reference to FIG. The floating structure includes a hull 10 and a propulsion device 30. The hull 10 includes a deck 11, a ship bottom skin 12, a casing 21, and a sealing flange portion 22 arranged at a position higher than the water line. A vertical hole 20 extending from the deck 11 to the ship bottom skin 12 is formed in the hull 10. The vertical hole 20 extends across the height of the water line. The casing 21 is provided around the vertical hole 20. The sealing flange portion 22 is formed so as to partially close the vertical hole 20 at a position lower than the water line. For example, the sealing flange portion 22 closes the peripheral portion without closing the lowermost central portion of the vertical hole 20. A moving device 13 such as a hoist or a hoisting machine is provided above the deck 11, for example, above the vertical hole 20. The moving device 13 performs vertical movement and horizontal movement of the suspended heavy object.

  FIG. 1 shows a state in which the propulsion device 30 is disposed at an operation position where thrust is generated. The propulsion device 30 is a marine thruster such as an azimuth thruster. The propulsion device 30 includes a propulsion device main body 31 and a drive device 35 disposed on the upper side of the propulsion device main body 31. The propulsion device main body 31 is disposed below the sealing portion 32, a sealing portion 32 that is pressed downward against the sealing flange portion 22 to close the vertical hole 20 in a watertight manner, a guide pipe 33 protruding upward from the sealing portion 32, and the sealing portion 32. And a thrust generator 34. The sealing part 32 is formed in a plate shape, for example. A packing (not shown) is provided between the sealing portion 32 and the sealing flange portion 22. The guide pipe 33 is fixed to the sealed portion 32 by welding or the like. The thrust generating unit 34 includes a propeller. The drive device 35 includes an electric motor that drives the propeller and an electric motor that rotates the thrust generating unit 34. The drive device 35 is detachable from the propulsion device main body 31. Here, the sealing flange portion 22 is formed so as to allow passage of the thrust generating portion 34 and not allow passage of the sealing portion 32.

  With reference to FIG. 2, a positioning guide 23 extending vertically is provided along the casing 21. A recess 32 a is formed in the peripheral portion of the sealing portion 32. The positioning guide 23 is disposed in the recess 32a. Since the casing 21 is cylindrical, the strength of the casing 21 is high.

  With reference to FIG. 3, the fastening structure which presses the sealing part 32 against the sealing flange part 22 downward is demonstrated. The sealing flange portion 22 is formed with a stud bolt mounting hole 22a and a guide hole 22b coaxial with the stud bolt mounting hole 22a. The guide hole 22b has a larger diameter than the stud bolt mounting hole 22a and is formed in a counterbore shape. The implanted bolt 41 screwed into the implanted bolt mounting hole 22 a forms a male thread portion protruding upward from the sealing flange portion 22. A through hole 32 b through which the stud bolt 41 passes is formed in the sealing portion 32. The through hole 32b and the guide pipe 33 are disposed coaxially. A portion of the stud bolt 41 protruding above the sealing portion 32 is disposed in the guide pipe 33. A nut 42 that engages with a portion protruding above the sealing portion 32 of the stud bolt 41 presses the sealing portion 32 against the sealing flange portion 22. The nut 42 is formed with a hole 43 through which the stud bolt 41 passes. The hole 43 includes a screw forming portion 43a in which a screw that engages with the stud bolt 41 is formed, and a positioning sleeve portion 43b in which a screw is not formed. The nut 43 presses the sealing portion 32 against the sealing flange portion 22 with the screw forming portion 43a positioned above and the positioning sleeve portion 43b positioned below.

  The offshore propulsion device maintenance method according to the present embodiment will be described below.

  Referring to FIG. 4, there is no seawater in the vertical hole 20. A ladder (not shown) is provided permanently in the casing 21 for an operator to ascend and descend the vertical hole 20. Alternatively, a temporary ladder such as a rope ladder is used to ascend and descend the vertical hole 20. The operator removes the drive device 35 from the propulsion device main body 31. The driving device 35 is lifted by using the moving device 13 to move up the vertical hole 20 and move onto the deck 11.

  Maintenance of the driving device 35 is executed on the deck 11.

  With reference to FIG. 5, steps for preparing to remove the propulsion device body 31 from the sealing flange portion 22 will be described. The worker retracts from the vertical hole 20 after attaching the hanger 14 (for example, a wire) of the moving device 13 to the sealing portion 32. Next, the extension guide pipe 53 is installed so as to be added to the guide pipe 33. A convex portion 54 protruding from the outer peripheral surface of the extension guide pipe 53 is formed at a position slightly below the upper end of the extension guide pipe 53. Next, the pushing flange 51 is placed on the convex portion 54 to form the pushing device 50. The pushing flange 51 is arranged at a position higher than the water line (above the vertical hole 20). At this time, the hanger 14 is in a state of being passed through the through hole 52 formed in the pushing flange 51. Here, the push-in flange 51 is formed with a through hole 51b through which the upper end of the extension guide pipe 54 can pass but the projection 54 cannot pass.

  As shown in FIG. 6, since the pushing flange 51 is configured to be divided by a dividing line 51 a reaching the through hole 52, when the pushing device 51 is formed by placing the pushing flange 51 on the convex portion 54. The pushing flange 51 and the hanging tool 14 do not interfere with each other.

  Referring to FIG. 5, the propulsion device main body 31 is pressed so as not to be lifted by using a jig (not shown) so as not to lift the pushing flange 51. Since the propulsion device body 31 is pressed using the extension guide pipe 53, the pressing work can be performed by an operator on the deck 11.

  With reference to FIG. 7, the step which removes the nut 42 from the implantation bolt 41 using the fastening device 60 is demonstrated. The fastening device 60 may be referred to as a hydraulic bolt fastening device. The fastening device 60 includes a tension applying device 61 and a nut attaching / detaching device 65. The tension applying device 61 includes a base portion 62, a hydraulic cylinder 63 attached to the base portion 62, and an engaging portion 64 connected to the hydraulic cylinder 63 via a rod. The nut attaching / detaching device 65 includes a cylinder 66, an air motor 67, a gear 68 driven by the air motor 68, a gear 69 that meshes with the gear 68, and an air chuck 70 provided on the gear 69. The air motor 67, the gears 68 and 69, and the air chuck 70 are provided inside the tip portion of the cylinder 66. The gear 69 is formed with a through hole 69a through which the stud bolt 41 can pass.

  The cylinder 66 of the nut attaching / detaching device 65 is inserted into the guide pipe 33 through the extension guide pipe 53, and the nut 42 is gripped by the air chuck 70. Since the cylinder 66 is guided by the guide pipe 33, it is easy to grip the nut 42 with the air chuck 70. At this time, a portion of the stud bolt 41 above the nut 42 protrudes upward from the through hole 69a. The engaging portion 64 of the tension applying device 61 is inserted into the cylinder 66 and engaged with the portion protruding upward from the through hole 69 a of the stud bolt 41, and the base portion 62 is installed on the pushing flange 51. Therefore, the slip portion of the tension applying device 61 is located at a position higher than the water line, and the hydraulic cylinder 63 is arranged at a position higher than the water line. Since the hydraulic cylinder 63 is outside the vertical hole 20, the hydraulic piping length can be shortened. The air motor 67 rotates the air chuck 70 while pulling the engaging portion 64 with the hydraulic cylinder 63 and applying tension to the stud 41. When the nut 42 is sufficiently separated from the sealing portion 32, the tension applying device 61 is removed, and the air chuck 70 is further rotated by the air motor 67 to remove the nut 42 from the implantation bolt 41. By using the fastening device 60, an operator on the deck 11 can remove the nut 42 from the stud bolt 41. Thereafter, the nut attaching / detaching device 65 is removed, and the pushing device 50 is removed. When the force for pressing the sealing portion 32 against the sealing flange portion 22 disappears, seawater enters the vertical hole 20.

  Since the air motor 67 and the air chuck 70 that operate with air are used, and the hydraulic cylinder 63 is disposed at a position higher than the water line, seawater is prevented from being contaminated with oil.

  The nut 42 may be rotated manually without using the air motor 67. For example, the air chuck 70 is fixed to the cylinder 66 and a handle is provided at the upper end of the cylinder 66.

  With reference to FIG. 8, the step of moving the propulsion device main body 31 from the operating position onto the deck 11 will be described. The propulsion device body 31 is lifted by using the moving device 13 to move up the vertical hole 20 and move onto the deck 11.

  Maintenance of the propulsion device main body 31 is executed on the deck 11.

  With reference to FIG. 9, the step which removes the implantation bolt 41 using the implantation bolt attachment / detachment apparatus 75 is demonstrated. The implantation bolt attaching / detaching device 75 includes a cylinder 76, an air motor 77, a gear 78 driven by the air motor 78, a gear 79 that meshes with the gear 78, and an air chuck 80 provided on the gear 79. The air motor 77, the gears 78 and 79, and the air chuck 80 are provided inside the distal end portion of the cylinder 76. The gear 79 is formed with a through hole 79a through which the stud bolt 41 can pass. First, the positioning sleeve 73 is installed in the guide hole 22b. The cylinder 76 of the implantation bolt attaching / detaching device 75 is inserted into the positioning sleeve 73, and the implantation bolt 41 is grasped by the air chuck 80. Since the cylinder 76 is guided by the positioning sleeve 73, it is easy to grasp the implantation bolt 41 with the air chuck 80. The air motor 77 rotates the air chuck 80 to remove the stud bolt 41 from the stud bolt mounting hole 22a. Thereafter, the implantation bolt attaching / detaching device 75 is removed, and the positioning sleeve 73 is removed.

  Since the air motor 77 and the air chuck 80 that operate with air are used, the seawater is prevented from being contaminated with oil.

  The implantation bolt 41 may be rotated manually without using the air motor 77. For example, the air chuck 80 is fixed to the cylinder 76 and a handle is provided at the upper end of the cylinder 76. Further, when the air chuck 80 grips the upper end of the stud bolt 41, the through hole 79a may not be provided.

  By lifting the implanted bolt 41 from the seawater until the propulsion device 30 whose maintenance has been completed is returned to the operating position, it is possible to prevent marine life from adhering to the implanted bolt 41. When marine life adheres to the implantation bolt 41, it is difficult to attach the nut 42 to the implantation bolt 41 when the propulsion device 30 is returned to the operating position.

  In the case where fresh water or sodium hypochlorite aqueous solution is supplied into the vertical hole 20 to prevent adhesion of marine organisms, the stud 41 may be left attached to the sealing flange portion 22. In order to prevent the attachment of marine organisms, a male screw portion protruding upward from the sealing flange portion 22 may be formed by welding a bolt to the sealing flange portion 22.

  With reference to FIG. 10, the step which returns the propulsion apparatus 30 which maintenance completed to the operation position is demonstrated. First, the stud bolt 41 is attached to the sealing flange portion 22 using the stud bolt attaching / detaching device 75 and the positioning sleeve 73. Next, the propulsion device body 31 is lowered into the vertical hole 20 using the moving device 13, and the sealing portion 32 is placed on the sealing flange portion 22. At this time, by aligning the position of the concave portion 32a of the sealing portion 32 with the positioning guide 23, the implanted bolt 41 protrudes upward from the sealing portion 32 through the through hole 32b and protrudes upward from the sealing portion 32 of the implanted bolt 41. A portion is disposed in the guide pipe 33. Next, the pushing device 50 is pressed so that the propulsion device main body 31 does not lift. Next, the nut 42 is attached to the stud bolt 41 using the fastening device 60 and the sealing portion 32 is pressed against the sealing flange portion 22. At this time, the nut 42 can be easily attached to the stud bolt 41 by gripping the nut 42 with the air chuck 70 so that the positioning sleeve portion 43b is on the lower side. Thereafter, the water in the vertical hole 20 is drained by the drain pump 85. After completion of draining, the pushing device 50 is removed, and the hanger 14 is removed from the propulsion device main body 31. In addition, you may remove the pushing-in apparatus 50 before starting drainage. Thereafter, the driving device 35 is lowered into the vertical hole 20 using the moving device 13, and the worker attaches the driving device 35 to the propulsion device main body 31.

  In the present embodiment, a pressing bar may be used instead of the extension guide pipe 53. In this case, the convex portion 54 is formed at a position slightly below the upper end of the presser bar, and a through hole that is a through hole for introducing the fastening device 60 into the vertical hole 20 and that is different from the through hole 51b is pushed in. To form. The lower end of the pressing bar presses the sealing portion 32 (a portion other than the guide pipe 33) downward.

  According to this embodiment, since the propulsion device 30 is moved between the operation position and the maintenance place using the vertical hole 20 in the hull 10, maintenance of the propulsion device 30 is performed offshore regardless of the weather and sea conditions. Is possible. Since the propulsion device main body 31 and the drive device 35 are moved separately, the moving device 13 for moving the propulsion device 30 may not be a large device. Since the attachment and detachment of the drive device 35 to and from the propulsion device main body 31 are performed in a state where there is no seawater in the vertical hole 20, a diver operation is unnecessary.

  Furthermore, the use of the pushing device 50 and the fastening device 60 eliminates the need for diver work for attaching and detaching the propulsion device body 31 to the sealing flange portion 22. By using the implantation bolt attaching / detaching device 75, a diver operation is unnecessary for attaching and removing the implantation bolt 41 to / from the sealing flange portion 22.

  The diver can also attach and detach the propulsion device main body 31 to and from the sealing flange portion 22.

(Modification of the first embodiment)
With reference to FIG. 11, the modification of the maintenance method of the propulsion apparatus on the ocean which concerns on 1st Embodiment is demonstrated. In this modification, the method of draining water from the vertical hole 20 after attaching the propulsion device main body 31 to the sealing flange portion 22 is different. The through hole 52 is sealed with a lid 87, and further, after sealing between the pushing flange 51 and the extension guide pipe 53, the upper end of the extension guide pipe 53, and between the pushing flange 51 and the deck 11, the air compressor 88 supplies compressed air into the bore 20. Seawater in the vertical hole 20 is discharged through a drain pipe 89. By closing a valve (not shown) provided in the drain pipe 89 after draining is completed and further supplying compressed air into the vertical hole 20, the sealing portion 32 can be strongly pressed against the sealing flange portion 22. .

(Second Embodiment)
With reference to FIG. 12, a floating structure according to a second embodiment of the present invention will be described. Hereinafter, only differences between the present embodiment and the first embodiment will be described, and description of common points will be omitted. In the present embodiment, the propulsion device main body 31 includes a gear drive lowering device 36 disposed on the upper side of the sealing portion 32. An operation unit (not shown) of the gear drive lowering device 36 is provided at a position higher than the water line (for example, outside the vertical hole 20). The stud 41 and the nut 42 fasten the sealing portion 32 to the sealing flange portion 22. The guide pipe 33 is not provided.

  With reference to FIG. 13, a rack 24 extending vertically is provided in the casing 21. The gear drive lowering device 36 includes a pinion (not shown) that meshes with the rack 24. The gear drive lowering device 36 kicks the rack 24 with a pinion and presses the sealing portion 32 downward against the sealing flange portion 22. In FIG. 13, the stud bolt 41 and the nut 42 are omitted.

  The offshore propulsion device maintenance method according to the present embodiment will be described below. Hereinafter, only differences between the present embodiment and the first embodiment will be described, and description of common points will be omitted.

  With reference to FIG. 14, the step of removing the propulsion device body 31 from the sealing flange portion 22 and moving it onto the deck 11 will be described. With the gear drive lowering device 36 kicking the rack 24 with a pinion and pressing the sealing portion 32 against the sealing flange portion 22, the operator removes the nut 42 from the stud bolt 41. The worker retreats from the vertical hole 20 after attaching the hanger 14 of the moving device 13 to the sealing portion 32. Next, the gear drive lowering device 36 releases the engagement between the pinion and the rack 24. When the force for pressing the sealing portion 32 against the sealing flange portion 22 disappears, seawater enters the vertical hole 20. The propulsion device body 31 is lifted by using the moving device 13 to move up the vertical hole 20 and move onto the deck 11.

  With reference to FIG. 15, the step of moving the propulsion device body 31 that has undergone maintenance to the operating position and attaching it to the sealing flange portion 22 will be described. The propulsion device body 31 is lifted using the moving device 13 and moved into the vertical hole 20. The gear drive lowering device 36 meshes the pinion and the rack 24. The gear drive lowering device 36 kicks the rack 24 with a pinion and presses the sealing portion 32 against the sealing flange portion 22. After draining the vertical hole 20, the worker attaches the nut 42 to the stud bolt 41 and fastens the sealing portion 32 to the sealing flange portion 22. Thereafter, the gear drive lowering device 36 stops pressing the sealing portion 32 against the sealing flange portion 22.

  According to the present embodiment, by using the gear drive lowering device 36, no diver work is required for attaching and detaching the propulsion device main body 31 to the sealing flange portion 22.

(Third embodiment)
A floating structure according to a third embodiment of the present invention will be described with reference to FIG. Hereinafter, only differences between the present embodiment and the first embodiment will be described, and description of common points will be omitted. The floating structure according to this embodiment includes a hull 10 and a propulsion device 130. The hull 10 includes a deck 11 arranged at a position higher than the water line, a ship bottom skin 12, a casing 121, and a sealing flange portion 122. The casing 121 has a hull structure or a container structure. A vertical hole 120 extending from the deck 11 to the ship bottom skin 12 is formed in the hull 10. The vertical hole 120 extends across the height of the water line. The casing 121 is provided around the vertical hole 120. The sealing flange portion 122 is formed so as to partially close the vertical hole 120 at a position lower than the water line. For example, the sealing flange portion 122 closes the peripheral portion without closing the lowermost central portion of the vertical hole 120. A moving device 13 is provided above the deck 11, for example, above the vertical hole 120.

  FIG. 16 shows a state in which the propulsion device 130 is disposed at an operating position where thrust is generated. The propulsion device 130 is a marine thruster such as an azimuth thruster. The propulsion device 130 includes a propulsion device main body 131 and a drive device 135 disposed on the upper side of the propulsion device main body 131. The propulsion device main body 131 includes a sealing portion 132 that is pressed downward on the sealing flange portion 122 to close the vertical hole 120 in a watertight manner, and a thrust generating portion 134 that is disposed below the sealing portion 132. The sealing part 132 is stored in the casing 121. A packing (not shown) is provided between the sealing portion 132 and the sealing flange portion 122. The thrust generating unit 134 includes a propeller. The drive device 135 includes an electric motor that drives the propeller and an electric motor that rotates the thrust generating unit 134. The drive device 135 is detachable from the propulsion device main body 131. Here, the sealing flange portion 122 is formed so as to allow passage of the thrust generating portion 134 and not allow passage of the sealing portion 132.

  The sealing portion 132 is pressed downward against the sealing flange portion 122 by the pushing device 150. The pushing device 150 includes a pedestal 154 provided on the deck 11, a pressing bar support 151 fixed to the pedestal 154 so as to be disposed above the vertical hole 120, and a pressing bar 153 to which the pressing bar support 151 is attached. With. A through hole 152 through which the driving device 135 can pass is formed in the presser bar support portion 151. The presser bar support portion 151 is formed in a flange shape (plate shape). The threaded portion of the presser bar 153 and the threaded portion of the presser bar support 151 are engaged so that the presser bar 153 moves up and down when the presser bar 153 rotates. The sealing portion 132 can be pressed against the sealing flange portion 122 by rotating the presser bar 153. Since the lower end of the presser bar 153 is disposed in the recess 132a formed in the sealed part 132, the lower end of the presser bar 153 is prevented from slipping when the presser bar 153 pushes the sealed part 132.

  Referring to FIG. 17, casing 122 is formed in a rectangular shape, and pad 122 for receiving a thrust force from propulsion device 130 is provided in casing 122. The pad 123 contacts the sealing part 132. The thrust pad 123 is made of resin, rubber, or a corrosion-resistant metal.

  The offshore propulsion device maintenance method according to the present embodiment will be described below. Hereinafter, only differences between the present embodiment and the first embodiment will be described, and description of common points will be omitted.

  Referring to FIG. 18, there is no seawater in the vertical hole 120. In the casing 121, a ladder (not shown) for an operator to go up and down the vertical hole 120 is permanently installed. Alternatively, a temporary ladder such as a rope ladder is used to ascend and descend the vertical hole 120. The presser bar support 151 is provided with a manhole (not shown) for an operator to descend into the vertical hole 120. The worker removes the driving device 135 from the propulsion device main body 31. The driving device 135 is lifted by using the moving device 13 to move up in the vertical hole 20 and pass through the through hole 152 and move onto the deck 11.

  Maintenance of the drive device 135 is executed on the deck 11.

  Referring to FIG. 19, the worker retracts from the vertical hole 20 after attaching the hanger 14 (for example, a wire) of the moving device 13 to the sealing portion 132. At this time, the hanger 14 is passed through the through hole 152 of the presser bar support 151. Next, the presser bar 153 is removed from the presser bar support part 151 and removed from the vertical hole 120. The moving device 13 can be used to remove the presser bar 153. When the force for pressing the sealing portion 132 against the sealing flange portion 122 is lost, seawater enters the vertical hole 120.

  Referring to FIG. 20, presser bar support 151 is removed from pedestal 154, and presser bar support 151 is removed from the position above vertical hole 121. The moving device 13 can be used to remove the presser bar support 151. Here, since the presser bar support part 151 is configured to be divided at a parting line 151 a reaching the through hole 152, the presser bar support part 151 and the hanger 14 interfere when the presser bar support part 151 is removed. do not do.

  With reference to FIG. 21, the step of moving the propulsion device body 131 from the operating position onto the deck 11 will be described. The propulsion device body 131 is lifted by using the moving device 13 to move up the vertical hole 20 and move onto the deck 11. The propulsion device main body 131 is fixed to the maintenance table 160 on the deck 11.

  Maintenance of the propulsion device main body 131 is executed on the deck 11.

  With reference to FIG. 22, a step of returning the propulsion device 30 whose maintenance has been completed to the operating position will be described. First, the propulsion device main body 131 is lowered into the vertical hole 120 using the moving device 13, and the sealing portion 132 is placed on the sealing flange portion 122. Next, the holding bar support 151 is attached to the base 154. Next, the screw portion of the presser bar 153 and the screw portion of the presser bar support portion 151 are engaged, and the sealing portion 132 is pressed against the sealing flange portion 122 with the presser bar 153. The sealing portion 132 and the sealing flange portion 122 are securely brought into close contact with each other by tightening with the specified torque of the presser bar 153. Thereafter, the water in the vertical hole 120 is drained by the drain pump 85. After completion of draining, the hanger 14 is removed from the propulsion device main body 131.

  Thereafter, the driving device 135 is lowered into the vertical hole 20 using the moving device 13, and an operator attaches the driving device 135 to the propulsion device main body 131.

  In this embodiment, since the sealing portion 132 is pressed against the sealing flange portion 122 by the presser bar 153 from a position higher than the water line, no diver work is required to attach and remove the propulsion device body 131 to the sealing flange portion 122. It is.

(Modification of the third embodiment)
With reference to FIG. 23, the modification of the maintenance method of the propulsion apparatus on the ocean which concerns on 3rd Embodiment is demonstrated. In this modification, the pressing bar 153 and the pressing bar 153A are used in combination. By supplying the hydraulic oil to the hydraulic cylinder 155 provided on the presser bar support 151 by the hydraulic pump 156, the sealing part 132 is pressed against the sealing flange part 122 by the presser bar 153A. By rotating the pressing bar 153 while the sealing portion 132 is pressed against the sealing flange portion 122 by the pressing rod 153A, torque for rotating the pressing rod 153 is reduced.

  The present invention has been described above with reference to the embodiment, but the present invention is not limited to the above embodiment. Various modifications can be made to the above embodiment, and the above embodiments can be combined.

DESCRIPTION OF SYMBOLS 10 ... Hull 11 ... Deck 12 ... Ship bottom skin 13 ... Moving device 14 ... Suspension tool 20 ... Vertical hole 21 ... Casing 22 ... Sealing flange part 22a ... Stud bolt mounting hole 22b ... Guide hole 23 ... Positioning guide 24 ... Rack 30 ... Propulsion Device 31 ... Propulsion device main body 32 ... Sealed portion 32a ... Recess 32b ... Through hole 33 ... Guide pipe 34 ... Thrust generator 35 ... Drive device 36 ... Gear drive lowering device 41 ... Stud bolt 42 ... Nut 43 ... Hole portion 43a ... Screw Forming portion 43b ... Positioning sleeve portion 50 ... Pushing device 51 ... Pushing flange 51a ... Dividing line 51b ... Through hole 52 ... Through hole 53 ... Extension guide pipe 54 ... Protruding portion 60 ... Fastening device 61 ... Tension applying device 62 ... Base 63 ... Hydraulic cylinder 64 ... engagement part 65 ... nut attaching / detaching device 66 ... cylinder 67 ... air motors 68, 69 ... gear 69a ... through Hole 70 ... Air chuck 73 ... Positioning sleeve 75 ... Screw bolt attaching / detaching device 76 ... Cylinder 77 ... Air motor 78, 79 ... Gear 79a ... Through hole 80 ... Air chuck 85 ... Drain pump 87 ... Lid 88 ... Air compressor 89 ... Water Extraction pipe 120 ... Vertical hole 121 ... Case 122 ... Sealing flange portion 123 ... Pad 130 ... Propulsion device 131 ... Promotion device main body 132 ... Sealing portion 132a ... Depression portion 134 ... Thrust generator 135 ... Drive device 150 ... Pushing device 151 ... Presser bar support Part 151a ... Dividing line 152 ... Through-holes 153, 153A ... Presser bar 154 ... Base 155 ... Hydraulic cylinder 156 ... Hydraulic pump 160 ... Maintenance stand

Claims (7)

Moving the propulsion device from an operating position where the propulsion device generates thrust using a vertical hole extending across the height of the waterline in the hull to a position higher than the waterline in the hull;
Performing maintenance of the propulsion device,
The hull includes a sealed flange portion formed so as to partially close the vertical hole at a position lower than the water line,
The propulsion device is
A propulsion device body;
A drive device disposed above the propulsion device body when the propulsion device is in the operating position;
The propulsion device body is
A sealing portion that is pressed downward against the sealing flange portion when the propulsion device is in the operating position to close the vertical hole in a watertight manner;
A thrust generating portion disposed below the sealing portion when the propulsion device is in the operating position;
In the step of moving the propulsion device, the propulsion device maintenance method for moving the propulsion device main body and the driving device separately on the ocean. Moving the propulsion device comprises:
Pressing the propulsion device body so as not to lift using a rod or pipe; and
Removing a nut that engages with a male screw portion protruding upward from the sealing flange portion using a fastening device and presses the sealing portion against the sealing flange portion;
The fastening device is:
A first air chuck for gripping the nut;
A first cylinder provided with the first air chuck;
An engagement portion that is inserted into the first cylinder and engages with a portion of the male screw portion above the nut;
The maintenance method of the propulsion apparatus on the ocean of Claim 1 provided with the hydraulic cylinder which pulls the said engaging part. The propulsion device body includes a guide pipe protruding upward from the sealed portion,
The method of removing the nut includes a step of inserting the first cylinder into the guide pipe. The male screw portion is a stud bolt,
Further comprising the step of removing the stud bolt from the sealing flange portion using a stud bolt attaching / detaching device;
The implantation bolt attaching / detaching device is
A second air chuck for gripping the stud bolt;
The maintenance method of the propulsion apparatus on the sea of Claim 2 or 3 provided with the 2nd cylinder provided with the said 2nd air chuck. Moving the propulsion device comprises:
Removing a pressing rod that presses the sealing portion against the sealing flange portion from a pressing rod support portion disposed above the vertical hole;
Removing the presser bar support from the upper position of the vertical hole,
The method for maintaining a propulsion device on the ocean according to claim 1, wherein the threaded portion of the presser bar and the threaded portion of the presser bar support part are engaged so that the presser bar moves up and down when the presser bar rotates. . The hull includes a casing provided around the vertical hole,
The casing is provided with a rack,
The propulsion device body includes a gear drive lowering device that kicks the rack with a pinion and presses the sealing portion against the sealing flange portion,
The method of moving the propulsion device includes the step of releasing the meshing between the pinion and the rack by the gear drive lowering device. Performing maintenance of the propulsion device;
Moving the propulsion device from a position higher than the waterline in the hull to an operating position where the propulsion device generates thrust using a vertical hole extending across the height of the waterline in the hull; and
The hull includes a sealed flange portion formed so as to partially close the vertical hole at a position lower than the water line,
The propulsion device is
A propulsion device body;
A drive device disposed above the propulsion device body when the propulsion device is in the operating position;
The propulsion device body is
A sealing portion that is pressed downward against the sealing flange portion when the propulsion device is in the operating position to close the vertical hole in a watertight manner;
A thrust generating portion disposed below the sealing portion when the propulsion device is in the operating position;
In the step of moving the propulsion device, the propulsion device maintenance method for moving the propulsion device main body and the driving device separately on the ocean.

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