JPS6360175B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trunnion structure for a drag arm in a drag suction dredger.

A drag suction dredger is equipped with a hopper and navigates while dragging a suction pipe called a drag arm, sucks up earth and sand with a pump through the drag arm, stores the earth and sand in the hopper, and transports it to the earth dumping site. It is.

Figure 1 shows such a drag suction dredger. In this dredger, drag arm 1
The base end 1a of the drag arm 1 is slidably supported by a guide frame 3 installed in the vertical direction of the hull 2a, and the base end 1a is suspended from a davit 5 via a wire rope 4. The tip portion 1b and the intermediate portion 1c are also suspended from davits 8 and 9 via wire ropes 6 and 7, respectively. And each of these wire ropes 4, 6, 7
is wound around the drums of winches 10, 11, and 12, which are installed on the deck 2b, respectively. Therefore, the drag arm 1 has wire ropes 4,
6 and 7 from the winches 10, 11, 12, and set along the hull 2a as shown by solid lines in FIG. ,11,1
2 by winding it up and storing it above the deck 2b, as shown by the dashed line in FIG.

By the way, in the above-mentioned drag suction dredger, the guide frame 3 is arranged so that the base end 1a of the drag arm 1 can be positioned sufficiently below the water line in order to fully cope with the work at a place with a large dredging depth. It is extended toward the bottom 2c of the ship.

Therefore, in such a drag suction dredger, the guide frame 3 acts as resistance during navigation, which not only reduces navigation performance, but also makes the trunnion structure of the drag arm including the guide frame 3 complicated and expensive. I was getting used to it.

This invention was made in order to solve the above-mentioned problems, and includes a pump-side suction pipe whose tip end is housed and installed horizontally and parallel to the hull of the ship in the ship's water slightly above the waterline. , an L-shaped connecting pipe having one end connected to the tip of the pump-side suction pipe via a swivel joint; and a drag arm having a base end connected to the other end of the L-shaped connecting pipe via a swivel joint. , a rotation shaft is installed concentrically with the suction pipe on the extension of the tip of the pump-side suction pipe, and the pump is installed inside the hull so as to rotate in a range from approximately horizontal to approximately vertical about the rotation axis. and a hanger arm with a sheave at the free end;
A wire rope is engaged with the drag arm and connected to a winch inside the hull via a sheave of the hanger arm.

One embodiment of this invention will be described with reference to the drawings.

FIG. 2 is a diagram conceptually showing the trunnion structure of the drag arm in the drag suction dredger of the present invention, and shows a part of the hull.
FIG. 3 is a perspective view showing the main parts thereof, and FIG. 4 is a diagram conceptually showing its operation.

As shown in the drawings, the trunnion structure of the drag arm connects the drag arm 21 to the pump-side suction pipe 23 in a specific manner at a specific location on the hull 22, and connects the drag arm 21 to the hanger arm via a wire rope 24. hang down to 25,
By winding up the wire rope 24 with a winch 26, it is housed in the hull 22 together with the hanger arm 25.

A suction pump (not shown) is connected to the base of the pump-side suction pipe 23, and communicates with a hopper inside the hull via the suction pump. The tip 23a of the suction pipe 23 is placed in a cutout recess 22d of a step 22c formed in the hull 22b slightly above the waterline 22a, parallel to the hull 22b.
And it is housed horizontally. A series of L-shaped connecting pipes 28 are connected to the tip of the suction pipe 23 via a swivel joint 27.
The other end of this L-shaped connection pipe 28 is connected to the base end of a drag arm 21 via a swivel joint 29, and the drag arm is bent at its base end 21a and connects to a drag head (not shown). A main portion of the drag arm including the main portion extends along the hull 22b. Furthermore, a bearing 36 coaxial with the tip 23a of the suction pipe 23, which is provided on the wall surface 35 of the notched recess 22d, is attached to and supported by the L-shaped connecting pipe 28.

On the other hand, the stepped portion 22c of the hull 22 has a cutout recess 2.
A recess 22e is formed adjacent to 2d, and the hanger arm 25 is accommodated within the recess. The hanger arm 25 is formed in a U-shape, and one end thereof is supported by a rotation shaft 30 disposed coaxially with the tip 23a of the suction pipe 23. This drag arm 25 has a recess 25a formed at its free end, and a sheave 31 is installed at its upper free end.

In addition, a winch 2 is provided on the stepped portion 22c of the hull 22.
6 is installed, and one end of a wire rope 24 is fixed to the step side wall 22f of the hull 22, and the other end of the wire rope 24 is connected. This wire rope 24 is connected to the hanger arm 2.
one of the sheaves 31 of No. 5, the sheaves 32, 32 installed on the drag arm 21, the other of the sheaves 31 of the hanger arm 25, the sheave 33 installed on the step side wall 22f of the hull 22, and the step 22 of the hull 22.
They are each wound around a sheave 34 installed at c.

The trunnion structure of the drag arm of this invention is
Since the structure is as described above, when the winch 26 is operated to wind up the wire rope 24 in the dredging operation state of the drag arm 21 shown in FIG. is pulled up and accommodated in the recess 25a of the hanger arm 25 as shown in FIG. Further, as the wire rope 24 is wound around the winch 26, the drag arm 21 is moved to the hanger arm 25.
At the same time, the hull 22 is rotated by the swivel joint 27, as shown by the two-dot chain line in FIG.
It is accommodated above the stepped portion 22c. In addition, when carrying out dredging work, the winch 26 is operated,
If you let out the wire rope 24, the drag arm 2
1 descends together with the hanger arm 25 due to its own weight, and the hanger arm 25 hits the stopper 22 of the hull 22.
After hitting g, etc. and stopping, it descends independently.

In addition, in the above-mentioned embodiment, the hanger arm 25
is formed in a U-shape, but this hanger arm 2
The wire rope 5 is not limited to a U-shape and may be a flat plate.
This wire rope 24 is fixed to 2f.
One end of the drag arm 21 may be locked to the drag arm 21.
Furthermore, it goes without saying that the same trunnion structure as in the above embodiment can be applied to the tip and intermediate portions of the drag arm 21.

As explained above, according to the present invention, there is no point of resistance during normal navigation of the dredger, so its propulsion performance is improved, and during dredging work, the base end of the drag arm is kept relatively close to the sea surface. Since it is located in the same position, there is almost no decrease in work efficiency, and the structure is simple, so it is inexpensive.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a dredger having a conventional drag arm trunnion structure, Fig. 2 is a partial side view of a dredger conceptually showing the drag arm trunnion structure of the present invention, and Fig. 3 is its drag arm. FIG. 4 is a conceptual diagram showing the operation of the drag arm and hanger arm. In the drawings, 21...drag arm, 21a... base end, 2
2...hull, 22a...waterline, 22b...ship hull, 22c...step, 22d...notch recess, 22
e... Recessed portion, 22f... Stepped side wall, 22g... Stopper, 23... Pump side suction pipe, 23a...
... Tip, 24 ... Wire rope, 25 ... Hanger arm, 25a ... Recess, 26 ... Winch,
27... Swivel joint, 28... L-shaped connecting pipe, 29... Swivel joint, 30... Rotating shaft, 31, 32, 33, 34... Sheave, 35
...Wall surface of the notch recess, 36...Bearing.

Claims (1)

[Claims] 1 Place the tip inside the hull slightly above the waterline,
A pump-side suction pipe housed and installed parallel and horizontally to the hull, and an L whose one end is connected to the tip of the pump-side suction pipe via a swivel joint.
A drag arm whose base end is connected to the other end of the L-shaped connection pipe via a swivel joint, and a drag arm which rotates concentrically with the suction pipe on the extension of the distal end of the pump-side suction pipe. a hanger arm that is installed inside the hull so as to have a moving shaft and rotate in a range from substantially horizontal to substantially vertical about the rotating shaft, and has a sheave at its free end;
A trunnion structure for a drag arm in a drag suction dredger, comprising a wire rope engaged with the drag arm and connected to a winch inside the hull via a sheave of the hanger arm.