JP2000211575A - Work boat spud device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To eliminate the need for a high-structure holding tower for holding a vertically moving spud so as to be able to move up and down, to simplify the structure for holding the spud, and to easily provide a spud device for an existing work boat. To install. A guide (4) is provided below a deck (11) of a work boat (1) for vertically guiding a spud (3) moving vertically, and moving pulleys (51, 52) are attached to the side of the spud (3). A pair of constant pulleys 53, 54, 55, 56 are mounted above the lower moving pulleys 51, 52, and a hoisting device 58 for driving the spud 3 up and down is provided on the work boat. Side is connected to the winding drum 58 a of the hoisting device 58, the other end is fixed to the work boat 1, and the middle of the wire rope 59 is connected to the moving pulleys 51 and 52 and the constant pulley 5.
3, 54, 55, and 56, the spud elevating and lowering booster mechanism 5 was configured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work boat used for performing dredging work such as sediment on the seabed or the seabed, submerging an object on the seabed or the seabed, and other water or sea work. The present invention relates to a spud device that temporarily keeps a predetermined working water area or sea area from moving,
A spud device for a work boat that eliminates the need for a high structure holding tower that holds the elevating spud so as to be able to move up and down, simplifies the spud holding structure, and allows the spud device to be easily installed on an existing work boat. It is about.

[0002]

2. Description of the Related Art Conventionally, for example, dredging work such as sediment on the seabed or the seabed, work for sinking an object on the seabed or the seabed, and other workboats used for water or sea work, include: In some cases, a spud device is installed to temporarily hold a work boat in a predetermined work area or sea area without moving.

[0003] A spud device installed in a work boat is configured to lower a pile-shaped spud provided vertically on the deck of the ship and contact the tip of the spud with a water floor or the seabed, thereby setting the work boat in a predetermined work area. Or, it is structured to temporarily keep it in the sea area. This spud device is provided with a holding tower of a high structure for holding a spud which is raised and lowered so as to be able to move up and down.

[0004]

However, as described above, the conventional spud device installed on the work boat is provided with a high holding tower for holding the elevating spud so as to be able to go up and down. For this reason, the equipment becomes large-scale, and the work boat is required to have a strength capable of supporting a high holding tower, and the structure of the work boat needs to be made robust accordingly.
It is also a factor of cost increase.

Further, in order to newly install a spud device on an existing work boat, it is necessary to install a tall holding tower, which requires a large-scale facility, and installs these facilities on the existing work boat. However, there is a problem that it takes time and the cost increases accordingly.

Further, in order to newly attach a spud device to an existing work boat, it is necessary to install a high holding tower. Therefore, the existing work boat needs to have a strength capable of supporting the holding tower. If the work boat does not have enough strength to support the holding tower, the spud device cannot be newly attached to the existing work boat.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in order to solve the problems. It is an object of the present invention to hold a high structure which holds a vertically moving spud so as to be able to move up and down. It is an object of the present invention to provide a work boat spud device that does not require a tower, simplifies the structure for holding the spud, and can easily install the spud device on an existing work boat.

[0008]

In order to achieve the above object, a first aspect of the present invention is to provide a guide below a deck of a work boat, which is provided with a guide for vertically moving a vertically moving spud. And a pair of fixed pulleys are mounted above the guide on the upper peripheral side of the guide, with a pair of fixed pulleys mounted above the guide. Is connected to the winding drum of the hoisting device, the other end is fixed to the work boat, and the middle part of the wire rope is arranged on the moving pulley and the constant pulley to constitute a spud lifting / lowering boosting mechanism. is there.

According to a second aspect of the present invention, a guide for vertically elevating and lowering a spud which rises and falls in a vertical direction is provided below a deck of a work boat, and a first moving pulley and a second moving pulley are rotated on both sides of the spud by the same rotation. It is mounted on an axis, and the first fixed pulley and the second fixed pulley are sandwiched on both sides above the lower first moving pulley on the upper peripheral side of the guide, and the second fixed pulley on the lower side. A third constant pulley and a fourth constant pulley are respectively mounted on both upper sides thereof, the first constant pulley and the fourth constant pulley are attached on the same axis of rotation with a spud interposed therebetween, and a second constant pulley and a third constant pulley are provided. Are mounted on the same rotation axis center line with the spuds therebetween, and the rotation axes of the first moving pulley, the second moving pulley, the first constant pulley, the second constant pulley, the third constant pulley, and the fourth constant pulley are parallel to each other. The moving pulleys and the moving pulleys are provided on the upper peripheral edge of the guide at the lower side of the second and third constant pulleys. Attaching an auxiliary constant pulley having a rotation axis in a direction orthogonal to each constant pulley, installing a hoisting device for elevating and lowering the spud on the work boat, connecting one end of the wire rope to the winding drum of the hoisting device, The other end is fixed to the work boat, and the middle of the wire rope is formed in the upper peripheral groove of the first fixed pulley, the lower peripheral groove of the first moving pulley, and the upper peripheral groove of the second fixed pulley. The peripheral groove on the lower side of the auxiliary constant pulley, the peripheral groove on the upper side of the third constant pulley, the peripheral groove on the lower side of the second moving pulley, and the peripheral groove on the upper side of the fourth constant pulley. And a means configured to form a spud elevating and lowering booster mechanism.

Here, as a preferred embodiment, a water tank is provided inside the spud at a place where it is submerged under the water surface or the sea surface during use, an inlet is provided at an upper part of the side surface of the water tank, and a bottom side of the water tank is provided. Has an outlet. In addition, a replaceable sliding member is mounted on the side surface of the spud that slides with the inner surface of the guide in the elevating direction, and the inner surface of the guide that slides with the sliding member of the spud is harder than the sliding member. The material is mounted in the vertical direction.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the invention shown in the drawings. Here, FIG. 1 is a side view of the work boat, FIG. 2 is a plan view of the work boat,
3 (A) is a side sectional view of the spud, FIG. 3 (B) is a sectional view of the spud, FIG. 3 (C) is a partially enlarged view of a corner of the spud, and FIG. 3 (D) is a view of a water tank inside the spud. 4 (A) is a plan view of the guide, FIG. 4 (B)
4 (C) is a bottom view of the guide, FIG. 4 (D) is a partially enlarged view of the guide, FIG. 5 (A) is a side view of the work boat spud device, and FIG. 5 (B) is It is a top view of the spud device for work boats.

In the figure, a work boat 1 is used for dredging work such as sediment on the seabed or the seabed, sinking an object on the seabed or the seabed, and performing other water or sea work. 1 is provided with a work boat spud device 2 for holding the work boat 1 so as not to temporarily move into a predetermined working water area or sea area. The work boat spud device 2 is installed on each of the left and right sides of the deck 11 on the rear side of the work boat 1.

A work boat spud device 2 according to the present invention.
Is composed of a guide 4 for vertically guiding the spud 3 that moves up and down, and a spud raising / lowering mechanism 5 for driving the spud 3 to move up and down along the guide 4, and holds the spud 3 that moves up and down so as to be able to move up and down. It is characterized in that a holding tower for high structures is not required, the structure for holding the spud 3 is simplified, and it can be easily installed on an existing work boat.

The spud 3 is made of a pile-like material that is long in the vertical direction. The tip of the lower end that cuts into the seabed is sharply pointed downward, has a rectangular cross section, and the inside of the rectangle is hollow. The material is steel.

A water tank 3 is provided in the lower part of the spud 3 at the place where it is submerged under the water surface or the sea surface during use.
1 is provided. The water tank 31 is formed inside the hollow of the spud 3, and the ceiling surface 31 a and the bottom surface 31 b of the water tank 31 are closed with a steel plate. An inlet 31c is provided on the upper side of the water tank 31 near the ceiling. The inlet 31c is formed on the lower side surface of the spud 3 and is in communication with the outside.

An outlet 31d is provided at the center of the bottom surface 31b of the water tank 31. One end of a drain pipe 31e is connected to the outlet 31d. The drain pipe 31e is attached in a horizontal direction, one end of which is bent upward,
The other end which is connected to the outlet 31d and extends in the horizontal direction is a spud 3 at a position on the opposite side below the inlet 31c.
And is in communication with the outside.

This water tank 31 is used when the spud 3 is used.
That is, when the lower end side of the spud 3 is partially supported by the undersea ground to be supported and the work boat 1 is fixed, the buoyancy acting on the spud 3 is reduced by adding water or seawater, and the spud 3 is spouted by the injected water or seawater. 3 is used to increase the weight on the lower side of the spud 3 and stabilize the lower side of the spud 3.

The spud 3 having a rectangular horizontal cross section has a replaceable sliding member 32 mounted on the side surface of the square at a right angle in the vertical direction, that is, the elevating direction. The sliding member 32 is provided on the inner surface of the guide 4 and has a sliding member 41a, 4 described later.
The portion sliding with 2a functions to smoothly move the spud 3 up and down in cooperation with the receiving sliding members 41a and 42a, and the side surface of the spud 3 is worn due to friction or the like when it moves up and down. Used to prevent.

On the right and left sides of the deck 11 on the rear side of the work boat 1, lifting holes 12 for raising and lowering the spuds 3 are formed downward. The elevating holes 12 penetrate the deck 11 downward and pass through to the bottom of the ship. The elevating hole 12 is formed of a square hole slightly larger than the spud 3 having a horizontal cross section that is slightly larger than the spud 3.
Is provided.

The guides 4 are provided in the up-down direction, that is, in the up-down direction, at the inner right-angled square portions of the square up-and-down holes 12, respectively, and guide the outer right-angled square portions of the spud 3 up and down.
It functions to prevent the spud 3 from tilting when it is raised and lowered.
In this embodiment, the guide 4 includes an upper guide 41 and a lower guide 42, and the upper guide 41 and the lower guide 4
2 is provided vertically apart, and no guide is provided on the way.

The upper guide 41 is provided above the elevating hole 12, and the upper side of the upper guide 41 protrudes toward the upper surface of the deck 11. Also, the lower guide 42
Is provided on the lower side of the lifting hole 12, and the lower guide 4
The lower end of 2 is provided at the same height as the lower end of the elevating hole 12 and does not protrude downward.

On the inner surfaces of the upper guide 41 and the lower guide 42 of the guide 4 which slides on the sliding member 32 of the spud 3, receiving sliding members 41a, 42a harder than the sliding member 32 are arranged in the vertical direction, that is, the elevating direction. And the inner surface of the guide 4 is protected from being worn by sliding.

The reason why the sliding members 41a, 42a of the guide 4 are harder than the sliding members 32 of the spud 3 is that the sliding members 41a, 42a of the spud 3 are harder.
The reason for this is to reduce or eliminate the need for replacement work by reducing the wear of 42a. This is because the sliding members 41a, 42a
Is provided inside the elevating hole 12, and the replacement operation is not easy. On the other hand, the sliding member 32 is attached to the outer side surface of the spud 3, and the replacement operation can be performed relatively easily.

The spud lifting and lowering mechanism 5 is a mechanism capable of raising and lowering the spud 3 with a small force when driving the spud 3 up and down along the guide 4. The first moving pulley attached to both sides of the spud 3 51, a second movable pulley 52, a first constant pulley 53, a second constant pulley 54, a third constant pulley 55, a fourth constant pulley 56, an auxiliary constant pulley 57, and a winding attached to the upper peripheral side of the guide 4. It comprises an upper device 58 and a wire rope 59.

In this embodiment, the spud elevating and lowering mechanism 5 can elevate and lower the spud 3 with a force of about one-fourth of its own weight. At this time, the wire rope 59 moves four times the elevating length of the spud 3.

The first moving pulley 51 and the second moving pulley 52 are mounted on both sides of the spud 3. That is, the first moving pulley 51 and the second moving pulley 52 are mounted on both sides of the spud 3 with the spud 3 interposed therebetween. The first moving pulley 51 is rotatably mounted on the rotating shaft 51a, and the second moving pulley 52 is rotatably mounted on the rotating shaft 52a.

The rotation shaft 51a of the first moving pulley 51 and the second
The rotation shaft 52a of the moving pulley 52 is mounted on the same rotation axis with the spud 3 interposed therebetween.
The moving pulley 52 rotates on the same rotation axis. The rotating shaft 51a of the first moving pulley 51 and the rotating shaft 52a of the second moving pulley 52
Are attached to the center of both lower side surfaces of the spud 3.

A first constant pulley 53 and a second constant pulley 54 are mounted on one side of the upper guide 41 of the upper guide 41 of the guide 4 at equal intervals on both sides of the first moving pulley 51. I have. The first constant pulley 53 and the second constant pulley 54 include a rotating shaft 5 that is pivotally supported on upper portions of bearing pedestals 53a and 54a formed upward on one side of the upper peripheral side of the upper guide 41.
3b and 54b are rotatably attached.

On the other side of the upper peripheral side of the upper guide 41 of the guide 4, a third constant pulley 55 and a fourth constant pulley 56 are mounted on both sides of the second movable pulley 52 at equal intervals. Have been. Third constant pulley 55 and fourth constant pulley 56
Is rotatably mounted on rotating shafts 55b, 56b supported on the upper portions of bearing pedestals 55a, 56a formed upward on the other side of the upper peripheral side of the upper guide 41.

Among them, the rotating shaft 5 of the first constant pulley 53
3b and the rotation axis 56b of the fourth constant pulley 56
Are mounted on the same rotation axis. Also,
The rotating shaft 54b of the second constant pulley 54 and the rotating shaft 55b of the third constant pulley 55 are mounted on the same rotational axis with the spud 3 interposed therebetween.

Further, the rotating shaft 51a of the first moving pulley 51,
The rotating shaft 52a of the second moving pulley 52, the rotating shaft 53b of the first constant pulley 53, the rotating shaft 54b of the second constant pulley 54, the rotating shaft 55b of the third constant pulley 55, and the rotating shaft 56b of the fourth constant pulley 56.
Are mounted in parallel.

As described above, the rotation axis 53b of the first constant pulley 53 and the rotation axis 54b of the second constant pulley 54 are located at the same distance from the rotation axis 51a of the first moving pulley 51. Similarly, the rotation axis 55b of the third constant pulley 55 and the rotation axis 56b of the fourth constant pulley 56 are located at the same distance from the rotation axis 52a of the second dynamic pulley 52.

The rotating shaft 53b of the first constant pulley 53, the rotating shaft 54b of the second constant pulley 54, the rotating shaft 55b of the third constant pulley 55, and the rotating shaft 56b of the fourth constant pulley 56 are at the same height. The rotating shaft 51a of the first moving pulley 51 and the second moving member 51 are mounted not only when the spud 3 is lowered when in use but also when the spud 3 is raised when not in use. The pulley 52 is always mounted at a position higher than the rotation shaft 52a.

The movable pulleys 51 and 52 and the fixed pulleys 53 and 54 are located on the lower side of the second fixed pulley 54 and the third fixed pulley 55 on the upper peripheral side of the upper guide 41 of the guide 4.
An auxiliary constant pulley 57 having an axis of a rotating shaft 57a in a direction orthogonal to 55 and 56 is attached.

A hoisting device 58 for driving the spud 3 up and down is provided on the deck 11 of the work boat 1. Hoisting device 58
Is provided on the deck 11 near the spud 3. The winding drum 58a of the hoisting device 58 is linked to a motor (not shown). The winding drum 58 a of the hoisting device 58 is provided on an extension of each of the moving pulleys 51 and each of the constant pulleys 53 and 54. The rotating shaft 58 of the winding drum 58a of the hoisting device 58
b denotes each of the moving pulleys 51 and 52 and each of the constant pulleys 53 and 5
4, 55, 56 rotary shafts 51a, 52a, 53b, 5
4b, 55b, and 56b.

A hoisting auxiliary constant pulley 58c is mounted on the opposite side of the spud 3 across the winding drum 58a of the hoisting device 58. The hoisting auxiliary pulley 58c is a hoisting auxiliary pedestal 58d.
Is rotatably mounted on a rotating shaft 58e which is pivotally supported on the upper part. The hoisting auxiliary pulley 58c is provided with a hoisting device 58.
Winding drum 58a, each of the moving pulleys 51 and each of the constant pulleys 5
It is provided on an extension of 3,54. The rotating shaft 58e of the hoisting auxiliary constant pulley 58c is connected to the rotating shaft 5 of the winding drum 58a.
8b and each of the moving pulleys 51 and 52 and each of the fixed pulleys 5
3, 54, 55 and 56 rotating shafts 51a, 52a and 53
b, 54b, 55b, and 56b.

One end of the wire rope 59 for transmitting power when the spud 3 is raised and lowered is connected to the hoisting device 5.
8 winding drum 58a. Wire rope 59
Is fixed on the deck 11 of the work boat 1 adjacent to the winding drum 58a.

The wire rope 59, one end of which is connected to the winding drum 58a and the other end of which is fixed to the work boat 1, is turned upside down by the hoisting auxiliary pulley 58c, and then turned around the upper part of the first pulley 53. Surface groove, peripheral groove on the lower side of the first moving pulley 51, peripheral groove on the upper side of the second constant pulley 54, peripheral groove on the lower side of the auxiliary constant pulley 57, and upper peripheral groove of the third constant pulley 55 Peripheral groove, second moving pulley 5
2 and the peripheral groove on the upper side of the fourth constant pulley 56 are arranged in this order.

Next, the operation based on the configuration of the above embodiment of the present invention will be described below. After moving the work boat 1 to a predetermined work water area or sea area, the work boat spud device 2 is operated to lower the spud 3 so that the work boat 1 does not move temporarily to the work water area or sea area. The work boat 1 is held in a predetermined working water area or sea area by partially digging into the sea floor.

The operation of the work boat spud device 2 is performed by rewinding a wire rope 59 having one end wound around a winding drum 58a of a hoisting device 58. The rewind length of the wire rope 59 is about four times the descending distance of the spud 3. When one end of the wire rope 59 is unwound, the spud 3 is guided by the guide 4 and descends by its own weight, and the sharp lower end of the spud 3 partially penetrates into the seabed ground, and the spud 3 is supported on the seabed. The work boat 1 is temporarily held in a predetermined working water area or sea area through the spud 3 supported on the seabed.

When the work by the work boat 1 is completed, the hoisting device 58 is driven and the wire rope 59 is attached to the winding drum 58a.
To take up one end. When one end of the wire rope 59 is wound, the first moving pulley 51 and the third constant pulley 55 suspended between the first constant pulley 53 and the second constant pulley 54.
The second moving pulley 52 suspended between the first pulley 56 and the fourth constant pulley 56 is raised. When the first moving pulley 51 and the second moving pulley 52 are pulled up, the spud 3 to which the first moving pulley 51 and the second moving pulley 52 are attached is also raised integrally and pulled up.

In this case, the first moving pulley 51 is
Wire rope 5 between fixed pulley 53 and second fixed pulley 54
9, the tension acting on the wire rope 59 is half of the load acting on the first moving pulley 51. Similarly, since the second moving pulley 52 is suspended by the wire rope 59 between the third constant pulley 55 and the fourth constant pulley 56, the tension acting on the wire rope 59 acts on the second moving pulley 52. Half of the applied load.

As described above, since the weight of the spud 3 is divided into two by the first moving pulley 51 and the second moving pulley 52, the winding tension acting on the wire rope 59 is reduced.
, The spud 3 can be pulled up with a small force, and the hoisting device 58 can be reduced in size. On the other hand, the winding length of the wire rope 59 is four times the rising distance of the spud 3.

It should be noted that the present invention is not limited to the above embodiments of the present invention, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. In the above-described embodiment, the case where the guide 4 is provided inside the elevating hole 12 formed through the deck 11 has been described. However, the present invention is not limited to this. It may be provided to protrude outward.

[0045]

As is apparent from the above description, according to the spud apparatus for a work boat according to the present invention, the vertically moving spud is supported by the guide for vertically moving the spud, and the spud is provided on the upper peripheral side of the guide. A pair of fixed pulleys is mounted above the lower moving pulley attached to the side of the vehicle, a wire rope is disposed between the moving pulley and the pair of fixed pulleys, and a pair of fixed pulleys is inserted through the wire rope. The spud can be lifted and suspended via a moving pulley. In this way, the lower part of the spud is supported by the guide, and the upper part thereof is supported by the pair of fixed pulleys and the moving pulley through the wire rope. This can be unnecessary, and the structure for holding the spud can be simplified. Furthermore, the spud device can be easily installed even on an existing work boat, so that an extremely novel and advantageous effect is exhibited.

Further, a water tank is provided inside the spud at a place where it is immersed below the water surface or under the sea surface during use, an inlet is provided at an upper portion of a side surface of the water tank, and a bottom surface of the water tank is provided. If there is an outlet on the side,
By putting water or seawater into the water tank, the buoyancy acting on the spud can be reduced, and the weight of the lower part of the spud can be increased by the injected water or seawater, whereby the lower part of the spud can be stabilized.

In addition, a replaceable sliding member is mounted on the side surface of the spud that slides on the inner surface of the guide in the elevating direction, and the inner surface of the guide that slides on the sliding member of the spud. When the sliding member, which is harder than the moving member, is attached in the elevating direction, the outer surface of the spud and the inner surface of the guide can be prevented from being worn by sliding. Moreover,
By using a receiving sliding member harder than the sliding member of the spud, the wear of the receiving sliding member on the inner surface of the guide, which is not easy to replace, can be reduced, and the replacement operation can be unnecessary or extremely reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a work boat showing an embodiment of the present invention.

FIG. 2 is a plan view of a work boat showing the embodiment of the present invention.

FIG. 3A is a side sectional view of a spud showing an embodiment of the present invention. (B) is a sectional view of the spud showing the embodiment of the present invention. (C) is a partial enlarged view of a corner of the spud showing the embodiment of the present invention. (D)
1 is a side cross-sectional view of a water tank inside a spud, showing an embodiment of the present invention, with a middle part omitted.

FIG. 4A is a plan view of a guide showing an embodiment of the present invention. (B) is a side sectional view of the guide showing the embodiment of the present invention. (C) is a bottom view of the guide showing the embodiment of the present invention. (D) is a partially enlarged view of the guide showing the embodiment of the present invention.

FIG. 5A is a side view of a working boat spud device showing an embodiment of the present invention. (B) is a plan view of the working boat spud device showing the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work boat 11 Deck 12 Elevating hole 2 Spud device for work boat 3 Spud 31 Water tank 31a Ceiling surface 31b Bottom surface 31c Inlet 31d Discharge port 31e Drain pipe 32 Sliding material 4 Guide 41 Upper guide 41a Receiving sliding material 42 Lower guide 42a Receiving sliding member 5 Spud lifting and lowering booster mechanism 51 First moving pulley 51a Rotating shaft 52 Second moving pulley 52a Rotating shaft 53 First constant pulley 53a Bearing pedestal 53b Rotating shaft 54 Second constant pulley 54a Bearing pedestal 54b Rotating shaft 55 Third constant pulley 55a Bearing pedestal 55b rotation axis 56 Fourth constant pulley 56a bearing pedestal 56b rotation axis 57 auxiliary constant pulley 57a rotation axis 58 hoisting device 58a winding drum 58b rotation axis 58c winding auxiliary constant pulley 58d winding auxiliary pedestal 58e Rotation axis 59 Wire rope

Claims (4)

[Claims] 1. A guide for vertically elevating and lowering a spud which rises and falls in a vertical direction is provided below a deck of a work boat, a movable pulley is attached to a side of the spud, and a lower movable pulley is sandwiched between upper guide edges of the guide. A pair of constant pulleys is mounted above the hoist, a hoisting device for driving up and down the spud is provided on the work boat, one end of the wire rope is connected to the winding drum of the hoist, and the other end is fixed to the work boat, A spud device for a work boat, wherein a midway of a wire rope is arranged on the moving pulley and the constant pulley to constitute a spud elevating and boosting mechanism. 2. A guide for vertically elevating and lowering a vertically moving spud is provided below a deck of a work boat, and a first moving pulley and a second moving pulley are mounted on both sides of the spud on the same rotation axis. A first constant pulley and a second constant pulley are provided on both sides of the upper peripheral edge of the guide with the lower first movable pulley interposed therebetween, and a third fixed pulley is disposed on both upper sides of the guide with the lower second movable pulley interposed therebetween. The fixed pulley and the fourth fixed pulley are mounted respectively, the first fixed pulley and the fourth fixed pulley are mounted on the same axis of rotation with the spuds interposed therebetween, and the second fixed pulley and the third fixed pulley are rotated the same with the spuds interposed therebetween. Attached on the axis, the first moving pulley, the second moving pulley, the first
The rotation axes of the constant pulley, the second constant pulley, the third constant pulley, and the fourth constant pulley are parallel to each other, and the upper and lower peripheral sides of the guides on the lower side of the second constant pulley and the third constant pulley are An auxiliary constant pulley having a rotation axis in a direction orthogonal to each moving pulley and each constant pulley is attached, a hoisting device for driving up and down of the spud is provided on the work boat, and one end of the wire rope is wound on a winding drum of the hoisting device. And the other end is fixed to the work boat.
Peripheral groove on the upper side of the first constant pulley, peripheral groove on the lower side of the first moving pulley, peripheral groove on the upper side of the second constant pulley, peripheral groove on the lower side of the auxiliary constant pulley, third constant The upper surface of the pulley, the lower surface groove of the second moving pulley, and the upper surface groove of the fourth constant pulley are arranged in this order to constitute a spud elevating and lowering mechanism. A spud device for a work boat, characterized in that: 3. A water tank is provided inside the spud at a place where it sinks below the water surface or the sea surface during use, an inlet is provided on an upper side of the water tank, and an outlet is provided on a bottom side of the water tank. The spud device for a work boat according to claim 1 or 2, which is provided. 4. A replaceable sliding member is mounted on the side surface of the spud that slides on the inner surface of the guide in the elevating direction, and the inner surface of the guide that slides on the sliding member of the spud is harder than the sliding member. The spud device for a work boat according to claim 1 or 2, wherein the receiving sliding member is attached in the elevating direction.