JPS6117645A - Dredger for both deep and shallow water areas in combination - Google Patents

Abstract

PURPOSE:To enhance the efficiency of dredging work by a method in which a suction ladder with a cutter which is supported in a tilting manner through the first supporter in the deep water area is set close to the cutter of the second supporter to be switched in shallow water area. CONSTITUTION:During the dredging work of deep water area, the bearing 16 of the hull supports detachably the trunnion shaft 5 for deep water area of a suction ladder 3. When switching it to the state of being supported by the trunnion shaft 14 close to the cutter in shallow water area, the ladder wire 7 is wound up to pull up the ladder 3 being turned until the hole of the shaft 14 is matched with the bearing 16 on the hull in terms of axis. The shaft 14 is inserted into and fixed to the hole, upper cover of the shaft 5 is removed, and the wire 7 is loosened. Whereupon, the ladder 3 is turned centrally to produce a margin in the angle between the seabed 23 and the ladder 3. The angle between the ladder 3 and the seabed 23 becomes greater even in the shallow water area, and the lowering of the operation rate can be prevented without any trouble with the swing of the ladder 3. The amount of sludge to be pumped up can be made constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dredger equipped with a suction ladder having a cutter for dredging, and particularly to a dredger that can be used both in deep water and shallow water.

[Conventional technology]

Conventionally, there is a dredger equipped with the above-mentioned suction ladder as shown in Fig. 4, in which the rotational force of a motor (not shown) is transmitted to the cutter 2 via the cutter shaft 1, so that the cutter 2 can cut the seabed 23. bedrock.

Mud, sand, sludge, etc. are excavated and the dredged soil is sucked into the ship through a suction pipe 4 along a suction ladder 3 along with seawater. The suction ladder 3 is suspended from the ladder wire 7 and rotated up and down about the trunnion shaft 5 by operating a ladder winch 6 disposed near the base end of the ladder gantry 20.

In addition, the hull is restrained to the seabed by spuds 8 provided at the stern, and anchors 9 are driven diagonally forward on both sides of the bow, and swing wires 11 connected to the anchors 9 are operated with a swing winch 10. By doing so, the suction ladder 3 swings left and right around the spud 8 along with the hull, and dredging work is performed.

In addition, the code|symbol 21 in a figure shows the upper deck, and 22 has shown the water line.

[Problem that the invention seeks to solve]

By the way, in deep water, the suction ladder 3 takes the position shown by the chain line in Fig. 4 and can dredge the seabed 23 without any hindrance, but in shallow water, the suction ladder 3 takes the position shown by the chain line in Fig. When the dredger assumes the position shown by the solid line and swings from side to side, the bottom surface of the rudder 3 rubs against the seabed 23, which reduces the dredging operation rate and reduces the amount of soil lifted. be.

The present invention attempts to solve the above-mentioned problems by providing a support part for deep water dredging and a support part for shallow water dredging in one suction ladder.
It is an object of the present invention to provide a dredger for both deep water and shallow water, which can carry out efficient dredging work in both deep water and shallow water by switching the use of these support parts.

[Means for Solving the Problems] For this reason, the dredger for both deep water and shallow water of the present invention has its base end tiltably supported by the hull via the first support part during deep water dredging, and its tip end is provided with a suction ladder equipped with a dredging cutter, and a second support part that can support the suction ladder in a tiltable manner by switching from the first support part when dredging in shallow water is provided with a suction ladder attached to the first support part. It is also characterized in that it is disposed at a position close to the cutter.

[Effect]

In the above-mentioned deep water/shallow water dredger of the present invention, the suction ladder is tiltably supported via the first support part during deep water dredging, and the cutter at the tip of the ladder is used to efficiently perform dredging work. When dredging water, by switching from the first support part to the second support part closer to the cutter, the lower side of the suction ladder does not scrape the seabed when swinging from side to side, thereby preventing any hindrance. Dredging work will be carried out without any delay.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
Figures 1 to 3 show a dredger for both deep water and shallow water as an embodiment of the present invention. Figure 1 is a side view showing the suction ladder pulled up, and Figure 2 is a side view of the suction ladder. FIG. 3 is a side view showing the dredger in a shallow water dredging state.

As shown in FIGS. 1 and 2, the base end of the suction ladder 3 in this dredger for both deep and shallow water uses includes a trunnion shaft 5 for deep water dredging as a first support part and its bearing (
(not shown) is tiltably supported by the hull.

As a result, dredging work can be carried out by sucking dredged soil into the ship while excavating the seabed 23 (see Figure 3) with the cutter 2 at the tip of the suction ladder 3, as in the conventional case. It has become.

In addition, the trunnion shaft 14, which serves as a second support part that can tiltably support the suction ladder 3 by switching from the trunnion shaft 5 during shallow water dredging, is closer to the cutter 2 than the trunnion shaft 5, which is the first support part. It is placed in the same position.

Note that the reference numeral 16 in FIG. 1 indicates a bearing that supports the trunnion shaft 14.

The trunnion shaft 14 is removably fitted into an insertion hole formed in the suction ladder 3, and when supported on the hull by the suction ladder 3 or the deep water trunnion shaft 5, the trunnion shaft 14 can be removed. has been done.

Further, as shown in FIG. 3, the rudder reaction pipe 18 and the hull suction pipe 17 are connected by a flexible rubber hose 19.

When switching from a state where the suction rudder 3 is supported on the hull by the trunnion shaft 5 as a first support part to a state in which the suction rudder 3 is supported on the hull by the trunnion shaft 14 as the second support part, First, the rudder wire 7 is wound up by operating the winch 6, and the rudder wire 7 is rolled up until the insertion hole of the shallow water trunnion shaft 14 in the suction ladder 3 and the axial center of the shallow water trunnion bearing 16 on the ship coincide with each other. The suction ladder 3 is pulled up while rotating around the trunnion shaft 5. Next, the shallow water trunnion shaft 14 is inserted into the insertion hole in the ladder 3.

When the upper cover of the bearing of the deep water trunnion shaft 5 is removed, the deep water trunnion shaft 5 is released from the bearing. When the rudder wire 7 is loosened, the suction ladder 3 rotates around the trunnion shaft 14 for shallow water, as shown in FIG. ,
It is possible to prevent problems such as the bottom surface of the suction ladder 3 from rubbing against the seabed.

In this way, even when dredging shallow water, the angle between the suction ladder 3 and the seabed 23 becomes large, so there is no problem when the lug 3 swings left and right, and a drop in operating efficiency is prevented. In this way, the amount of soil lifted can be kept constant.

In addition, the trunnion shaft 5 as the first support part and the second
When carrying out repair work on the trunnion shaft 14, which serves as a supporting part for the Repair work such as replacing bearing metal can be easily performed.

Furthermore, if the dredger is to be moved after the work is completed, the suction ladder 3 can be fixed to the hull using both trunnion shafts 5, 14 to ensure safe navigation.

〔Effect of the invention〕

As described in detail above, according to the dredger for deep water and shallow water of the present invention, the proximal end is tiltably supported by the hull via the first support part during deep water dredging, and the dredger is provided at the distal end for dredging. A second support part is provided with a suction ladder equipped with a cutter, and is capable of supporting the suction ladder in a tiltable manner by switching from the first support part during shallow water dredging. It has a simple structure that is placed close to the water, and when dredging deep water, it can be used in the same way as conventional dredging, and when dredging shallow water, the angle between the suction ladder and the seabed can be increased. This eliminates the problem of scraping the seabed when the rudder swings left and right, and has the advantage of keeping the dredging operation rate constant and preventing a decrease in the amount of soil lifted.

In addition, metal replacement work for deep-water trunnion bearings, which required ancillary equipment such as a crane boat and purge, is now possible with conventional suction rudder dredgers that only have a trunnion shaft bow.
The dredger of the present invention has the advantage that it can be easily carried out without using the above-mentioned incidental equipment.

[Brief explanation of the drawing]

Figures 1 to 3 show a dredger for both deep and shallow water as an embodiment of the present invention. Figure 1 is a side view of the dredger with its suction ladder pulled up, and Figure 2 is a side view of the suction ladder. A side view, FIG. 3 is a side view showing the above-mentioned dredger in a shallow water dredging state, and FIG. 4 is a side view showing a conventional dredger. 1... Cutter shaft, 2... Cutter, 3... Suction ladder 14... Suction pipe, 5... Trunnion shaft as the first support part, 6... Ladder winch, 7...
Ladder wire, 8... spud, 9... anchor, 1
0...Swing winch, 11...Swing wire,
14... Trunnion shaft as second support part, 16...
Bearing, 17... Suction pipe with hull, 18... Suction pipe with rudder, 19... Flexible rubber hose, 20... Rudder gantry, 21... Upper deck, 2
2. Water line, 23. Seabed. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] The suction ladder is provided with a suction ladder whose base end is tiltably supported by the hull via a first support part when dredging in deep water, and a dredging cutter is attached to the tip, and when dredging in shallow water, the suction ladder is A deep/shallow water area characterized in that a second support part that can be tiltably supported by switching from the first support part is disposed at a position closer to the cutter than the first support part. Dual-purpose dredger.