JPS61126228A - Position adjustable drag head - Google Patents

Abstract

PURPOSE:To facilitate adjustment of the position of a drag head and to perform an efficient dredging work, by a method wherein a rudder is protruded downward from a drag head for drag suction dredger, and a steering device for a rudder is provided. CONSTITUTION:A rudder 10 is mounted in a recess 4a, formed in the rear central part of a drag head 4 through the medium of a hinge 12, the lower part of the rudder 10 is penetrated into sea bottom earth 7, and a hydraulic cylinder 11, serving as a steering device, is mounted between the inner wall of the recess 4a and the rudder 10. When the drag head 4 is tugged for dredging work, the steering angle of the rudder 10 is properly adjusted through remote control from a ship. This enables the drag head 4 to be located in a given dredging position, and enables to perform an efficient dredging work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a drag head for a dog dredger, and more particularly to a position-adjustable drag head.

[Conventional technology]

The dog dredger 1 is generally constructed as shown in FIG.

That is, a drag head 4 is installed at the tip of a drag arm 3 connected to the hull by a trunnion 6, and while the dredger is sailing, the drag head 4 is used as a sail to suck up submerged soil 7.

The suctioned earth and sand passes through the drag 7-m 3, passes through a mud suction pump (not shown) inside the ship, and is finally discharged into the mud hold 2 inside the ship.

Note that the drag arm 3 is suspended from the hull by a wire 5.

There are several types of drag heads, but the Cali 7 Ornia type shown in Figures 4 and 5 is generally the most commonly used.

In such a drag head 4 of the 7t Luni 7 type, the 7 langes 8 are for connecting with the drag arm 3, and the submerged soil 7 (see Figure 3) flows through the opening 9 on the bottom surface of the dog head 4. It gets sucked in.

[Problem that the invention seeks to solve]

By the way, when dredging work is performed using the conventional drag head as described above, there are cases where there are locally high places in the submerged soil 7, and it is necessary to intensively dredge those high places.

However, since the drag 7-m 3 is suspended from the dredger 1 by a wire 5, it is easily moved laterally by tidal currents, etc., and it is difficult to maneuver the ship so that the drag head 4 is at the desired position. However, there is a problem in that it is almost impossible to dredge only the high water bottom.

In order to solve this problem, if there is a locally high spot, the area around it has to be dredged many times to make it deeper overall, which is a wasteful process.

Furthermore, the conventional dog head 4 has the problem that during the above-mentioned dredging work or during normal dredging work, the dog head 4 tends to fall into the trench once dug, and tends to dig deep only in a certain place. be. In such a case, with the conventional dog head 4, even if the boat is moved laterally, the drag 7-m 3 remains suspended by the gear 5, so it is difficult to remove it from the groove into which it has fallen. There is a problem.

The present invention aims to solve these problems, and aims to prevent over-digging by making it possible to move the dog head to a desired dredging position, so that dredging work can be carried out efficiently. The object of the present invention is to provide a drag head with an rtR type drag head.

[Means for solving problems]

Therefore, the position-adjustable dog head of the present invention has a rudder protruding downward from the drag head in order to hit the position R1119 of the drag head in a drag head for a 1-inch dredger. It is characterized by being equipped with a steering device.

[Effect]

In the above-described position-adjustable dog head of the present invention, the rudder is adjusted to the required rudder angle by the steering device and used for sailing, thereby displacing to the required mass production glA or to the right, making it easy to adjust the position of the dog head. It will be held in

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
1.2 shows a position-adjustable dog head as an embodiment of the present invention, FIG. 1 is a side view thereof, and FIG. 2 is a partially cutaway plan view thereof.

As shown in Fig. 1.2, a drag head 4 for a drag suction dredger is constructed, and the same symbols as those shown in 3rd to 5th UA indicate similar parts.

That is, in addition to the conventional structure, the dog head 4 in this embodiment has a rudder 10 installed at a center line position in a recess 4a formed at the center of the rear part of the dog head 4 via a hinge 12. ing.

The rudder 10 extends below the dog head 4, and is designed to steer the rudder into the water bottom 7 (see figure) during dredging.

A hydraulic sill 11 as a steering device is interposed between the tip side of the rudder 10 and the inside of the recess 4a of the dog head 4, and the hydraulic sill 11 is connected to a hydraulic system (not shown) on the ship. It is connected to the ship and can be expanded and contracted by remote control from the ship.

The rudder 10 is moved by the hinge 12 due to the expansion and contraction of this hydraulic cylinder 11.
The steering angle can be adjusted by rotating around the .

Note that the rudder 10 may be attached so as to be offset from the center line position of the dog head 4.

Further, a pair of rudders 10 may be installed on the left and right sides of the dog head 4, and the rudder 10 may be attached at a plurality of required locations.Furthermore, the rudder 10 may be attached to the front portion of the dog head 4.

Since the position-adjustable dog head as an embodiment of the present invention is constructed as described above, the dog head 4 is towed at a speed of 2 to 4 knots during normal dredging work.

When it is desired to move the dog head 4 laterally, the rudder angle of the serpentine 10 is adjusted to a required state by remote control from the boat. Then, since the dog head 4 is used as a sail, a lateral force corresponding to the rudder angle is generated, causing lateral movement.

However, unless the rudder 10 penetrates into the submerged soil 7,
In the structure of this embodiment in which the lateral force is weak and it is difficult to generate a targeted lateral movement, the position of the dog head 4 is quickly adjusted by the resistance of the soil acting on the mud rudder 10.

Therefore, at the time of dredging, the dredger 1 is maneuvered to near the required dredging position, and then the drag head is moved to the right or left t1h by the above-mentioned means so that the drag head 4 is positioned at an accurate dredging position. . This results in
The drag head 4 can be accurately brought to the position to be dredged.

In addition, when the drag head 4 falls into the groove,
The drag head 4 can also be easily removed from the groove.

In other words, with conventional drag heads, when dredging a certain area on the water bottom, it was necessary to maneuver the dredger 1 so that the drag head was in that position, but this was also affected by the effects of tidal winds, etc. Therefore, it was almost impossible to maneuver the dredger 1 with precision, and we had to carry out the unnecessary work of over-handling.

However, with the structure of this embodiment, the wasteful work of over-digging, which was forced in conventional dredging work, can be greatly reduced.

〔Effect of the invention〕

As described in detail above, according to the position-adjustable drag head of the present invention, the drag head for a one-inch dredger has a position as high as 1! In order to perform l1lI adjustment, the drag head can be accurately adjusted with a simple configuration that includes a rudder that protrudes toward the gauge from the drag head and a steering device for the rudder. This has the advantage that the drag head can be easily pulled out of the trench, and over-digging can be prevented, allowing dredging work to be carried out more efficiently.

In addition, since the rudder is used with it penetrating the underwater soil,
There is also the advantage that the lateral force generated is greater than when using an underwater rudder, and the position of the drag head can be adjusted quickly.

[Brief explanation of the drawing]

Fig. 1.2 shows a position-adjustable drag head as a major embodiment of the present invention, Fig. 1 is a side view thereof, Fig. 2 is a partially cutaway plan view thereof, and Figs. Figure 5 shows a conventional drag suction 'IIi dog head for a boat.
FIG. 3 is a schematic diagram showing the equipment state, FIG. 4 is a side view thereof, and FIG. 5 is a partially cutaway plan view thereof.
11・
・Dredger, 2..Mud tank, 3..Drag arm, 4..Drag head, 4a..Concavity, 5..Wire, 6..Trunion, 7..Above the water bottom, 8..7 Runno, 9. ...1" mouth, 10.. snake, 11.. hydraulic shilling as a steering device, 12.. hinno. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 2m Figure 113 Figure 4 Figure 5

Claims (1)

[Claims] A drag head for a drag suction dredger, characterized in that a rudder protruding downward from the drag head and a steering device for the rudder are provided in order to adjust the position of the drag head. Adjustable drag head.