JPS61126227A - Position adjustable drag head - Google Patents

Abstract

PURPOSE:To facilitate adjustment of a position by means of resistance, by a method wherein resistance members are attached to both gunnels of a drag head for a drag suction dredger so that they can be protruded downward and retracted. CONSTITUTION:Flat panels 11, serving as a resistance member, are mounted to both gunnels of a drag head 4 so that they can be protruded downward and retracted, and either of the flat panels 22 can be selectively protruded through the working of a driving device 13 formed with a hydraulic cylinder 10. During a normal dredging work, the flat panels 11 are lifted up, and when the drag head 4 is moved in either direction of right and left, the flat panel 11 on the reverse side is protruded into earth. This causes resistance of sea bottom earth 7 to be exerted on the flat panel 11 to move a dredger in the opposite direction, resulting in the possibility to facilitate adjustment of a position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a drag head for a drag dredger, and more particularly to a 14g type drag head.

[Conventional technology]

The drag suction dredger 1 is generally configured as shown in Figure 3.

That is, a drag head 4 is installed at the tip of a drag armco (connected to the hull with 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 arm 3, passes through a mud suction pump (not shown) inside the ship, and is finally discharged to 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 most common ones are the Cali 7 Orni 71! shown in Figures 4 and 5. ! is the most commonly used.

In the drag head 4 of the 177 Orni 7 type, the 7 run 8 is for connecting with the drag arm 3, and the submerged soil 7 (see Figure 3) is sucked through the opening 9 on the bottom surface of the dog head 4. Be it.

[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, the drag arm 3 is 5t' from the dredger 1.
Because it is suspended, it is easy to move laterally due to tidal currents, etc., and it is difficult to maneuver the boat so that the dog head 4 is at the desired position, and it is said to be nearly impossible to dredge only locally high water bottoms. There is a problem.

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

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 ship is moved laterally, the drag 7-m 3 remains suspended by the wire 5, so it is difficult to remove it from the groove into which it has fallen. There is a problem.

The present invention is an attempt to solve these problems, and makes dredging work more efficient by making it possible to move the dog head onto the dredging position jrC of +Vr'H to prevent over-digging. I tried to do it well, 1ffilil
The purpose is to provide a complete drag head.

[Means for solving problems]

For this reason, the present invention is all! The complete drag head is in position 1 of the drag head for drag suction dredgers! In order to increase resistance on one side of the dog head, a pair of resistance members are provided on both left and right sides of the dog head so as to be able to protrude downward and retract the same, and one of the resistance members is provided on both sides of the dog head. It is characterized by being provided with a roller drive device for selectively protruding.

[Effect]

In the above-described position-adjustable dog head of the present invention, by causing one of the pair of resistance members to protrude from the dog head using the drive device, the resistance on the protruding side increases;
The dog head is guided to the side where the resistance member does not protrude, and the height of the dog head is easily performed.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. Figures 1.2 show a position adjustable drag head as an embodiment of the present invention, and Figure 1 is a side view thereof, fj &
Figure 2 is a partially cutaway view.

As shown in FIGS. 1 and 2, a drag heft 4 for a dredger is constructed, and the same reference numerals as those shown in FIGS. 3 to 5 indicate similar parts.

That is, in addition to the conventional structure, the dog head 4 in this embodiment has a pair of flat plates 11 and 11 as resistance members on both left and right sides of the dog head 4 to protrude and retract the dog head 4 downward. is equipped to do so.

The flat plate 11.11 is adapted to be driven by a drive device 13.13 fixed to both sides of the dog head 4,
Either of the plates 11.11 can be selectively projected when required.

Body! I! The hydraulic cylinder 10 is connected to the hydraulic cylinder 10 by a bracket 12 fixed to the dog head 4 and a hydraulic cylinder 10 attached to the bracket 12. ), and is expanded and contracted by the X1UWA operation from the ship, so that the flat plate 11 protrudes when the hydraulic sill 10 is extended.

Note that the flat plate 11 may have another shape (for example, a cylindrical shape).

Further, the drive device 13 may be a drive device of another type, such as a screen drive device.

Since the 111 m drag head as an embodiment of the present invention is constructed as described above, it is difficult to pull up the left and right flat plates 11 from the soil during normal dredging work. (
In order to reduce the resistance by a small amount), dredging is performed in exactly the same way as a conventional doghead.

When it becomes necessary to move the dog head 4 to the left, the hydraulic cylinder 10 of the right drive unit w113
was extended by remote control from onboard the ship, and the flat plate 1 on the right side was
1 is made to protrude downward and penetrate into the underwater soil 7.

As a result, the resistance of the underwater soil 7 acts on the right flat plate 11, and the resistance on the thigh side of the dog head 4 increases, causing the dog head to move to the left. At this time, the left flat plate 11 is left in the retracted state.

Conversely, when you want to move the dog head 4 to the right, the hydraulic cylinder 10 of the right drive unit (I!13) is contracted by remote control from onboard to retract the right flat plate 11, and the left drive unit 13 is extended to make the left flat plate 11 protrude and penetrate into the underwater soil 7. As a result, the resistance of the underwater soil acts on the left flat plate 11, and the resistance on the left side of the dog head 4 is reduced. increases, and the dog head 4 moves to the right.

That is, the dredger 1 is maneuvered to the vicinity of the required dredging position,
Thereafter, the dog head 4 is moved to the right or left by the means described above so as to place the dog head 4 in the correct dredging position. This makes the drag head l/4
can be brought to the exact location where it should be dredged.

In case the dog head 4 falls into the ditch,
The doteg head 1''4 can be easily removed from the groove.

In other words, with conventional dogheads, when dredging a certain area with water, it was necessary to maneuver the dredger 1 so that the doghead was in that position, but due to the influence of tidal winds, etc. As a result, it was nearly impossible to maneuver dredger 1 with precision, resulting in unnecessary work such as over-digging.

However, with the structure of this embodiment, the wasteful work of over-excavation, which is unavoidable in conventional dredging work, can be greatly reduced.

〔Effect of the invention〕

As detailed above, the present invention is W1il! According to the Type 19 drag head, in a drag head for a drag suction dredger, downward protrusion and retraction are provided on both left and right sides of the dog head in order to adjust the position of the drag head by increasing the traction resistance on one side. 752. A simple configuration that includes a pair of resistance members equipped to allow the resistance member to protrude, and a drive device capable of selectively protruding one of the resistance members. A~y F t, Eil+
:0 position adjustment □6 (As it becomes like this, it becomes possible to pull the dog head out of the trench, and it becomes possible to prevent over-digging, making dredging work more efficient. There are advantages to becoming like this.

[Brief explanation of drawings]

Figure 1.2 shows the position f? as an embodiment of the present invention. ! This shows an adjustable drag head. Figure 1 is a side view, Figure 2 is a side view, and Figure 2 is a side view.
The figure is a partially cutaway plan view, and figures tA3 to 5 show a conventional drag head for a 1-inch dredger.
Figure 3 is that! FIG. 4 is a side view thereof, and FIG. 5 is a partially cutaway plan view thereof. 1. Dredger, 2. Mud tank, 3. Drag arm, 4.
・Dog head, 5...wire, 6...t2on, 7
・・Underwater soil, 8・・7 runs, 9・・opening, 10・・
Hydraulic shilling, 11...Flat plate as a resistance member, 12.
・Bracket, 13... Drive device. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 3 Figure 4 Figure 15! ! 1

Claims (1)

[Claims] In a drag head for a drag suction dredger, in order to adjust the position of the drag head by increasing the traction resistance on one side, a pair of drag heads are provided on both left and right sides of the drag head so as to be able to protrude downward and retract. A position-adjustable drag head comprising: a resistance member; and a drive device capable of selectively protruding one of the resistance members.