JPH0257497A - Grab dredger moving device - Google Patents

Abstract

PURPOSE:To prevent damage of sliding parts of a grab dredger moving device, which is to move the dredger by allowing a winch to take up a wire bound with a transfer spat driven into the water bottom, by inserting the spat through a damper sleeve fitted slidably in a long hole. CONSTITUTION:A grab dredger, in which a crane 4 is furnished with possibility of revolving round a vertical axis relative to a hull 1 for the purpose of hanging a cramshell 3, is equipped with a transfer spat 10 loosely fitted in a long hole 6 provided approx. in the center of the hull 1 and stretching in the direction fore and aft and also a fixing spat 19 loosely fitted in a part provided in the rear part of the hull 1. In the condition that this fixing spat 19 is drawn off from the sea ground, cables 25a, 25b are tracted by winches 24a, 24b for moving the hull 1 relatively along the mentioned long hole 6. A damper sleeve 28 is fitted slidably along the long hole 6, and the transfer spat 10 is inserted through this damper sleeve 28 in such a way as movable up and down.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Field of Application The present invention is a method for driving a grab ship by driving a sput into the water bottom and winding the wire tied to the sput with a winch. This invention relates to a moving device for a grab ship.

(2) Prior Art Conventional grab vessels are moved by anchoring them at both port and starboard positions at the bow and stern, and manipulating wires or chains that connect the anchors to the hull. However, with such conventional mobile devices, the wires connecting the anchor occupy a wide area of sea, which obstructs the navigation of ships passing nearby, and it takes time to drop the anchor, which reduces the construction period for dredging work. was having a negative impact.

For the above reasons, the hull of a grab ship is equipped with a movable spat that is loosely fitted into a long hole that extends in the front and back direction formed in the center, and a fixing spat that is loosely fitted into a hole that is formed at the rear of the hull. A moving device for a grab ship has been proposed (see Japanese Patent Publication No. 49-20430).

According to this moving device, when the moving spat is driven into the water bottom and the other end of the wire is tied to the lower part of the moving spat and is wound up with a winch via the end of the boat, the boat can move through the elongated hole while being guided by the movement spat. After the hull has been moved, both the moving and fixing spats are driven into the bottom of the water to secure the hull, and dredging work is carried out using grabs.

(3) Problems to be Solved by the Invention However, when a grab ship equipped with the above-mentioned moving device moves with the moving spat driven into the water bottom, if the hull is shaken by wind and waves, the moving spat fixed to the water bottom There was a risk that the long holes in the hull would rub violently against each other, causing wear and distortion to the sliding contact areas.

The present invention has been made in view of the above-mentioned circumstances, and is a moving device for a grab ship that is capable of preventing injury to one person at the sliding contact portion between the moving spat and the elongated hole of the hull, which is caused by the shaking of the ship. The purpose is to provide

B0 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a movable spat that is loosely fitted into a long hole extending in the front and back direction formed approximately in the center of the hull; A fixing spant loosely fitted to a part provided at the rear of the hull, a crane that can rotate around an axis perpendicular to the hull, a grab suspended from this crane, and a grab that moves up and down each of the spats. A moving device for a grab ship comprising a lifting device that is driven into the bottom of the water by a lift, and a towing device that moves the moving spat along a long hole, in which a buffer sleeve is slidable back and forth along the long hole formed in the hull. Attach the moving subbar 7-') to this buffer sleeve.
'2 It is characterized by being inserted so that it can be slid vertically.

(2) Effects According to the present invention having the above-described configuration, when the moving spat driven into the water bottom is slid along the elongated hole of the hull by the traction device, the hull is moved by the reaction. At this time, even if the hull moves against the moving spat due to wind and waves, the buffer sleeve prevents the elongated hole and the moving spat from directly rubbing against each other, preventing wear and distortion from occurring in the sliding contact area. .

(3) Examples Hereinafter, the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 and 2, a crane 4 having a grab 3 suspended by a wire 2 is attached to the front of the hull 1 of the grab ship.
and the crane 4 is operated.

A long hole 6 extending in the longitudinal direction is formed in the center of the hull 1 so as to penetrate vertically, and a turret 7 is erected at the front end of the long hole 6. A moving spat 10 having a pulley 9 attached to its upper end via a bracket 8 is loosely fitted into the elongated hole 6, and a wire 11 with one end tied to the bracket 8 is loosely fitted into the elongated hole 6.
is wound around the pulley 9 and the pulley 12 provided at the top of the turret 7, and then wound around a winch 14 as a lifting device via a pulley 13 provided on the hull 1.

On the other hand, a pulley 18 is inserted into the hole 16 formed at the base of the turret 15 erected at the rear of the hull 1 through a bracket 17 at the upper end.
The fixing spud 19 with the attached fixing spud 19 is loosely fitted so as to be vertically slidable. The wire 20 with one end tied to the bracket 17 is wound around the pulley 1 and the pulley 21 provided at the top of the turret 15, and then passed through the pulley 22 provided on the hull 1 to a winch as a lifting device. It is wound up in 23.

The moving spat 10 and the fixing span 19 are lowered by gravity by unwinding the winches 14 and 23, and the tapered portions formed at their lower ends are driven into the water bottom to restrain the hull l. There is.

A pair of winches 24a and 24b as towing equipment are provided on both sides of the rear of the hull 1, and a moving spat 10
Two wires 25a, 2 with one end tied near the lower end of
5b are respectively wound onto the winches 24a and 24b via pulleys 26 and 27 provided at the stern.

As shown in FIGS. 3 to 5, a long hole 6 formed in the hull 1
There is a cylindrical buffer sleeve 2 over the entire length in the vertical direction.
8 is loosely fitted into the elongated hole 6, and substantially rectangular flanges 28a and 28b provided at both upper and lower ends of the buffer sleeve 28 are inserted into the elongated hole 6.
They are in sliding contact with the inner periphery with a slight gap. A pair of brackets 29 are protruded from both sides of the upper flange 28a, and rollers 30 provided on the brackets 29 are engaged with guide rails 31 laid along both sides of the elongated hole 6. As is clear from FIG. 5, the guide rail 31 is inclined with respect to the horizontal deck surface of the hull 1 so that the bow side is lower.

Next, the operation of the embodiment of the present invention having the above-described configuration will be explained.

As shown in FIG. 1, normal dredging work is carried out with the hull 1 fixed by driving both the moving spat 10 located at the front end of the long hole 6 and the fixing spat 19 located at the stern into the water bottom. be exposed.

To move the hull 1, as shown in FIG.
After pulling up from the bottom of the water, a pair of winches 24a, 24b
The wires 25a and 25b tied to the lower part of the f-hyperactivity spant 10 are pulled. Then, the moving spant 1
0 is guided by the elongated hole 6 integrally with the buffer sleeve 728 and moves rearward, and the buffer sleeve 28 is slightly raised by the roller 30 moving along the inclined guide rail 31. Then, due to the relative movement between the moving spat 10 and the hull 1, the hull 1 moves forward by the length of the elongated hole 6. At this time, the forward direction of the hull 1 can be controlled by varying the winding speeds of the left and right winders 24a, 24b and adjusting the tensions of the left and right wires 25a, 25b.

When the hull 1 moves forward by the length of the elongated hole 6 in this manner, the fixing spat 19 is driven into the water bottom again, and then the wire 11 is wound up with the winch 14 and the movable spat 10 is pulled up from the water bottom. Then, the buffer sleeve 28 supported by the guide rail 31 via the roller 30 moves forward while descending under the action of gravity, and automatically returns to the tip of the elongated hole 6.

At this time, the wire 11 that suspends the moving spat 10 from the tower 7 is inclined as shown in FIG.
Since the buffer sleeve 2 acts in a direction that helps the forward movement of
8 is integrated with the moving spat 10 and can move forward smoothly.

The moving spat 10 that has returned to the tip of the elongated hole 6 is driven into the water bottom again, and by repeating the above cycle, the hull 1 can be moved to a predetermined position.

In addition, to change the direction of the hull 1, use the moving spat 10.
Alternatively, with only one of the fixing spats 19 driven in, the grab 3 may be thrown into the bottom of the water and the crane 4 may be rotated. In this way, the hull 1 rotates in a predetermined direction around the movable spat 105 or the fixed spat 19 due to the reaction force received from the water bottom due to the rotation of the crane 4.

During dredging work, the hull 1 is shaken by wind and waves, and in particular, when moving or turning with only the moving spat 10 driven into the water bottom, the shaking of the hull 1 becomes even greater. At this time, the moving span 10 and the long hole 6 formed in the hull 1 will rub against each other, but the buffer sleeve inserted between the moving span 10 and the long hole 6 prevents direct sliding between them. movement is prevented. That is, the movable spat 10 is protected from wear and deformation by sliding smoothly on the inner surface of the buffer sleeve 28, and the elongated holes 6 are formed by flanges 28a, 28b of the buffer sleeve 2, which have a larger diameter than the movable spat 10.
Sliding contact relieves stress concentration and prevents damage.

Although the embodiments of the present invention have been described above in detail, the present invention is not limited to the embodiments described above, and various small design changes may be made without departing from the scope of the invention described in the claims. It is possible to do so.

For example, the wire 2 connected to the winches 24a, 24b from the lower part of the moving spat 10 via the rear part of the hull 1
In addition to 5a and 25b, by attaching a wire that connects to the winch via the front of the hull 1, it becomes possible to tow the moving spat 10 in both forward and backward directions, and the hull 1
can also be moved backwards.

C1 Effects of the Invention According to the above-mentioned grab ship moving device of the present invention, a buffer sleeve is attached to the buffer sleeve so as to be slidable back and forth along the long hole formed in the hull, and a moving spat is attached to the buffer sleeve so as to be slidable up and down. This prevents the movable spant and the elongated hole from directly rubbing against each other even if the hull is shaken by wind or waves. Therefore, abrasion and damage to the sliding parts of the moving spat and the elongated hole are reliably prevented, and its durability can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a grab ship equipped with a moving device according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along the line ■-■ of Fig. 1, and Fig. 4 is IV-IV in Figure 3.
FIG. 5 is a sectional view taken along the line V-V in FIG. 3, and FIG. 6 is an overall side view of the grab ship for explaining the present invention in detail. 1... Hull, 3... Grab, 4... Crane, 6
...Long hole, 10...Movement spout, 14...Winch (elevating device) 19...Fixing spant, 23.
...Winch (elevating device), 24a, 24b...Winch (traction device), 28...Buffer three 7

Claims (1)

[Claims] A moving spat (10) loosely fitted into an elongated hole (6) extending in the front-rear direction formed at approximately the center of the hull (1);
1), a fixing spat (19) loosely fitted to the rear part of the ship, a crane (4) that can rotate around an axis perpendicular to the hull (1), and a crane (4) that The suspended grab (3) and each of the spats (10, 1
Lifting device (14, 23) that raises and lowers 9) and drives it into the bottom of the water.
and a traction device (24a, 24b) for moving the moving spat (10) along the elongated hole (6); the elongated hole (6) formed in the hull (1); A moving device for a grab ship, characterized in that a buffer sleeve (28) is attached so as to be slidable back and forth along the buffer sleeve (28), and the moving spout (10) is inserted through the buffer sleeve (28) so as to be slidable up and down. .