JPS5919212B2 - Emergency hoisting method for dredging ladder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to prevent damage to the rudder wire during dredging by a cutter dredger.
The present invention relates to a method for hoisting a rudder using a swing winch and a swing wire on the dredger.

When a rudder wire breaks during dredging, a crane boat is generally used to lift the rudder above the water surface, and a driller must manually attach the hoisting wire to the deep underwater area near the tip of the submerged rudder. accompanied by difficulties.

It is also necessary to temporarily attach a sling to support the rudder, which has been lifted above the water surface by a crane ship, on the dredger until the rudder wire is replaced or other repairs are completed.

In view of the above-mentioned problems, the present invention was proposed for the purpose of providing a method for easily lifting the ladder by one ship using means on board when the rudder wire system is damaged. The left and right swing wires are straddled over the ladder gantry via sheaves or rollers and connected to each other in an endless manner at the required height.
The rudder is pulled up by pulling up the intermediate section from the leading sheave to the swing block and supporting it via sheaves or rollers on both sides of the rudder gantry, and driving a pair of left and right swing winches on the ship to pull up the rudder. It is something.

In carrying out the method of the present invention, the tip of the swing wire is lifted out of the water by pulling up the swing anchor using an anchor boat accompanying the dredging work and removing the swing wire from the anchor.

In addition, the sheave or roller for the anchor wire lead used in the method of the present invention is pre-swaged on the ladder gantry and equipped for emergency purposes, and a simple device such as a snatch block that pulls up the tip and middle portions of the anchor wire is installed on the ladder gantry. It is convenient to have a lifting device on the ladder gantry.

According to the method of the present invention, when the rudder cannot be lifted due to cutting of the rudder wire or damage to the rudder winch, it is possible to easily lift the rudder by using the swing anchor and swing winch on the own ship without chartering a crane ship or the like. It became possible to carry out repairs by lifting
This has the effect of significantly reducing cost and time loss.

Next, the present invention will be explained with reference to the illustrated embodiment.
In the figure, 1 is the rudder gantry on the dredger 2, 3 is the cutter-suction rudder that is pivoted to the hull with a trunnion 4, 5 is from the ladder winch 6 on the ship to the sheave block 7 on the top of the rudder gantry, and the sheave block 8 on the rudder. The rudder wire 9 is connected to a pair of anchor wire winches 10 on the left and right on the ship, a guide sheave 11 on the gantry, a guide sheave 12 on the rudder, a leading sheave 13, and a swing block 14. This is a swing wire connected to a swing anchor 15 that extends through the rudder to the left and right of the rudder.

The swing block 14 is one that can be turned from the side to the top so that it can be lifted by this method.

16 is a snatch block provided with one gantry top for pulling up the swing wire, 17 is a pair of sheaves or rollers provided to support the swing wire by straddling the gantry top, and 18 is a gun to support the middle part of the swing wire. A pair of sheaves or ropes installed on both sides of the trip.

The method of the present invention is that when the rudder wire 5 during signaling breaks, the swing anchor 15 is pulled up on board by the anchoring ship, the end of the swing wire 9 is removed from the anchor, and then the tip side of one swing wire 9 is connected to the gantry. Pulling sheave or roller 1 using upper snatch block 16
At the required height above the water surface 19, that is, at the height above the swing block 14 of the ladder 3 in the suspended state, connect the end of the other swing wire 9 with a shackle etc. Concatenate 20.

Similarly, the middle portion of the swing wire 9 extending from the leading sheave 13 to the swing block 14 is pulled up to the gantry door by the snatch block 16 and fitted onto a sheave or roller 18 for support.

The swing wire 9 in this state is shown as A in FIG.

In the present invention, in this state A, the rudder 3 is lifted by gradually winding and driving the pair of left and right swing winches 10 on the ship, and the rudder and swing wire 9 in the lifted state are shown in FIG. Shown as B.

Further, FIG. 2 shows the front view of the state shown in FIG. 1B.

During this lifting, the two sets of left and right swing wires 9 whose ends are endlessly connected 20 are placed on each sheave 17 and act as an equalizer, so even if the left and right swing winches 10 are not aligned, The rudder rises smoothly without the need for a tuning device.

According to this method, in the event of an emergency such as when the rudder wire is cut, the rudder can be safely lifted and repaired using equipment on the ship and the anchorage boat accompanying the dredging work, and a crane ship can be chartered or This method has the advantage that it is possible to eliminate waste of time and money, and the equipment used in this method can be very simple.

The tips of the swing wires may be connected to both ends of another wire straddled over the sheave 17 at a required height above the water surface.

[Brief explanation of drawings]

Fig. 1 is a partial side view of a dredger illustrating the rigging state in which the method of the present invention is carried out, and Fig. 2 is a partial side view of a dredger along line ■-n in Fig. 1.
It is a front view showing a state. 1... Ladder gantry, 2... Hull, 3... Dredging ladder, 5... Rudder wire, 6... Ladder winch, 7, 8...
... Sheave block for ladder wire, 9 ... Swing wire, 10 ... Swing winch,
11, 12... Guide sheave, 13...
・Swing leading sheave, 14...Swing block, 15...Swing anchor, 1
6...Snatch block for pulling up the swing wire, 17.18...Sheave or roller for supporting the swing wire, 20...Connection portion between ends of the swing wire.

Claims (1)

[Claims] 1. The tips of the left and right swing wires are straddled over the rudder gantry via a sheave or roller and connected to each other in an endless manner at the required height above the water surface, and the middle section from the leading sheave of the left and right swing wires to the swing block is An emergency hoisting method for a dredging ladder, characterized in that the rudder is lifted up by supporting each part on both sides of a rudder gantry via sheaves or rollers, and by winding and driving left and right swing winches on a ship.