JPS6360179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drag head device with a cutter used in a self-propelled suction dredger or the like.

Generally, as shown in Figure 1 (schematic diagram), a self-propelled suction dredger has a drag head 3 attached to the tip of a drag arm 2 grounded on seabed soil 4, and uses a dredging pump installed inside the ship to remove seabed soil 4. Dredging is carried out while suctioning and storing it in the hopper 1.

By the way, as the drag head 3, a California type drag head 5 as shown in FIG. 2 (side view) has conventionally been used. Due to the scouring effect of excavating and moving seabed soil by the jet water flow,
Seabed soil can be dredged.

In addition, the reference numeral 7 in FIG. 2 indicates a claw, and the reference numeral 8 indicates an inlet member.

However, such conventional draghead devices have the disadvantage that their dredging ability is significantly reduced when the seabed soil is hard and compact.

Therefore, a drag head device with a cutter equipped with a rotary cutter has been developed.

Figure 3 (longitudinal sectional view) and Figure 4 (side view)
Both show examples of the above-mentioned cutter-equipped drag head device.

In the cutter-equipped drag head device shown in FIG. It is maintained.

In FIG. 3, reference numeral 10 indicates an inlet member, P indicates the flow of seawater to the inlet member 10, and Q indicates the direction of movement of the drag head with cutter.

In addition, in the drag head device with cutters shown in FIG. 4, the drag head with cutters is placed on the posture stabilizing sled 14 to keep the excavation depth t constant. A hinge 17 is provided between the inlet member 15 and the inlet member 15 to accommodate changes in water depth and the like.

By the way, when the power to drive the cutter is constant, when the seabed soil 4 is the area, the excavation depth t needs to be made thinner, and conversely, when the seabed soil 4 is soft, the excavation depth t needs to be made thicker. The amount of excavated soil can be increased.

However, in the case of a cutter-equipped drag head device as shown in FIG. 4, the excavation depth t is constant, so it is fixed at a certain depth t. If the excavation depth t of the cutter is fixed when excavating hard seabed soil 4, when excavating soft seabed soil 4, the hydraulic motor 16 may have too much power than necessary. Furthermore, if the excavation depth t of the cutter is fixed when excavating soft seabed soil 4, the power of the hydraulic motor 16 is insufficient when excavating hard seabed soil 4, and the cutter 13
There is a problem that it stops.

The present invention aims to solve these problems, and aims to provide a draghead device with a cutter that can adjust the excavation depth of the cutter depending on the soil quality of the seabed during dredging work. do.

Therefore, the drag head device with a cutter of the present invention includes a drag head main body supported by a sled for posture stabilization, and an inlet member at the tip of the drag arm rotatably mounted on the sled about a horizontal horizontal axis, A cutter for submarine excavation supported inside the drag head body and a drive mechanism for the cutter are provided, and an upper sled member having front ends of the sleds pivotally connected to each other in order to adjust the excavation depth of the cutter. and a lower sled member, the drag head body is supported on the upper sled member, and an excavation depth adjustment mechanism is provided by adjusting the opening degree of the upper sled member and the lower sled member. It is a feature.

Hereinafter, a drag head device with a cutter as an embodiment of the present invention will be explained with reference to the drawings.
FIG. 5 is a side view of the excavation at a deep depth, and FIG. 6 is a side view of the excavation at a shallow depth.

As shown in FIGS. 5 and 6, the attitude stabilizing sled 14, which can move along the seabed, has a drag case 19.
A drag head main body 24 such as the above is supported, and a suction port member 15 at the tip of the drag arm is rotatably mounted around the horizontal horizontal axis of the hinge 17.

Further, inside the drag head main body 24, a submarine excavation cutter 13 and a hydraulic motor 16 as a drive mechanism for the cutter 13 are provided.

Further, in order to adjust the excavation depth of the cutter 13, the sled 14 is moved in the longitudinal direction by an upper sled member 14a.
and a lower sled member 14b, and the front ends of these members 14c, 14b are pivotally connected to each other via a hinge 20. Then, the upper sled member 1
A drag head body 24 is supported on the drag head 4a.

Further, an upper sled member 1 is provided at the rear end of the sled 14.
An excavation depth adjustment mechanism K is provided by adjusting the opening of the lower sled member 4a and the lower sled member 14b.

As this excavation depth adjustment mechanism K, a perforated member 21 in which a number of holes 23 are vertically arranged is fixed on the lower sled member 14b, and the upper sled member 14a is connected to this member 21 via a pin 22. It is becoming more and more common.

In addition, the code 4' in Figures 5 and 6 indicates soft seabed soil,
4'' is the hard seabed soil, t1 is the excavation depth of the cutter 13 in the soft seabed soil 4', and t2 is the excavation depth of the cutter 13 in the hard seabed soil 4''.

Since the drag head device with a cutter according to the present invention is constructed as described above, in order to perform dredging work on a soft seabed, the attitude stabilizing sled 14 at the tip of the drag arm is first seated on the seabed.

As shown in FIG. 5, when dredging soft seabed soil 4', the excavation depth t1 of the cutter 13 is set deep, and the hydraulic motor 16
By operating the cutter 13, the cutter 13 is rotated and the seabed soil 4' is excavated.

In addition, when dredging hard seabed soil 4'', as shown in FIG. When the position is changed, the degree of opening between the upper sled portion 14a and the lower sled member 14b changes with the hinge 20 as the center.

Then, the upper sled member 14a and the lower sled member 1
4b, the lower sled member 14
Since the distance between the lower end of b and the lowest end of the cutter 13 becomes shorter, the excavation depth t2 of the cutter 13 becomes shallower than the excavation depth t1 in the soft submarine soil 4'.

In this way, if the excavation depth of the cutter 13 can be varied, dredging can be carried out most efficiently within the power of the cutter-equipped drag head in accordance with the soil quality of the seabed.

Note that even if a telescopic device such as a hydraulic cylinder is used as the excavation depth adjustment mechanism instead of the perforated member 21 with a large number of holes 23 and the pin 22,
Similar effects can be obtained.

As detailed above, according to the cutter-equipped drag head device of the present invention, the drag head main body supported by the posture stabilizing sled, and the drag arm tip mounted on the sled so as to be rotatable about the horizontal horizontal axis are suctioned. A cutter for submarine excavation is provided with a mouth member and supported inside the drag head body, and a drive mechanism for the cutter, and the sled pivots the front end portions of the cutter relative to each other in order to adjust the excavation depth of the cutter. The drag head body is supported on the upper sled member, and the excavation depth adjustment mechanism is configured by adjusting the opening degree of the upper sled member and the lower sled member. With a simple configuration in which a cutter is installed, the excavation depth of the cutter can be easily adjusted according to the quality of the seabed soil, and the power of the cutter-equipped draghead device can be effectively used to efficiently carry out dredging work. Another advantage is that it can be done.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the working state of a self-propelled suction dredger, Figures 2 to 4 show a conventional drag head device, Figure 2 is a side view, and Figure 3 is the same as in Figure 2. FIG. 4 is a longitudinal cross-sectional view showing the improved drag head device with cutters, FIG. 4 is a longitudinal cross-sectional view showing the improved drag head device in FIG. 3, and FIGS. 5 and 6 show a drag head device with cutters as an embodiment of the present invention. FIG. 5 is a side view of the excavation at a deep depth, and FIG. 6 is a side view of the excavation at a shallow depth. 1...Hopper, 2...Drag arm, 3...
Drag head, 4...Seafloor soil, 4'...Soft seabed soil, 4''...Hard seabed soil, 13...Cut for submarine excavation, 14...Sled for posture stabilization, 14a...
Upper sled member, 14b...Lower sled member, 15...
... Suction port member, 16 ... Hydraulic motor as drive mechanism, 17 ... Hinge, 19 ... Drag head case, 20 ... Hinge, 21 ... Perforated member, 2
2... Pin, 23... Hole, 24... Drag head body, t1, t2... Excavation depth of cutter, K...
Excavation depth adjustment mechanism.

Claims (1)

[Claims] 1 A drag head body supported by a sled for attitude stabilization, and a suction port member at the tip of a drag arm rotatably mounted on the sled about a horizontal horizontal axis, and a seabed supported inside the drag head body. An excavation cutter and a driving mechanism for the cutter are provided, and the sled is composed of an upper sled member and a lower sled member whose front ends are pivotally connected to each other in order to adjust the excavation depth of the cutter, A drag head device with a cutter, characterized in that the drag head main body is supported on the upper sled member, and is provided with an excavation depth adjustment mechanism by adjusting the opening degree of the upper sled member and the lower sled member.