JPS6360176B2 - - 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, a self-propelled suction dredger has a drag head 3 attached to the tip of a drag arm 2 grounded on the seabed soil 4, as shown in Fig. 1 (schematic diagram).
Dredging is carried out by sucking up seabed soil using a dredging pump installed inside the ship 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, so that when the water depth changes, the inlet member 15 is displaced to the position shown by the chain line, so that the inlet member 15 can respond to the change.

By the way, when the power to drive the cutter is constant, when the seabed soil 4 is hard, 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 driving mechanism for the cutter are provided, and an excavation depth adjustment member extending in the front-rear direction along the lower surface of the sled is provided to adjust the excavation depth of the cutter. It is characterized in that a plate is detachably provided, and the adjustment plate is formed so that its thickness in the vertical direction gradually increases from its front end to its rear end.

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, FIG. 6 is a side view of the excavation at a shallow depth, and FIG. FIG. 3 is a perspective view showing a depth adjustment plate.

As shown in FIGS. 5 and 6, the attitude stabilizing sled 14, which can move along the seabed, is provided with a hinge 17, and the drag head case 19, etc. The main body 20 and the suction port member 15 at the tip of the drag arm are rotatably mounted, and the drag head main body 20 is supported by a sled 14 for posture stabilization.

Further, inside the drag head main body 20, a cutter 13 for seabed excavation and a hydraulic motor 16 as a drive mechanism for the cutter 13 are provided.

Furthermore, in order to adjust the excavation depth of the cutter 13, the posture stabilizing sled 14 and the drag head main body 20 are rotated about the hinge 17, and the cutter 13 is rotated around the hinge 17.
An excavation depth adjustment plate 18 for moving the sled 3 upward is detachably attached to the lower surface of the posture stabilizing sled 14.

That is, the excavation depth adjustment plate 18 is attached so as to extend in the longitudinal direction of the posture stabilizing sled 14, and is formed so that the thickness in the vertical direction gradually increases from the front end to the rear end. When the lower surface of the depth adjustment plate 18 engages with the submarine soil 4,
The drag head main body 20 can be stably supported.

Then, the excavation depth adjustment plates 18, 1 are formed with varying thicknesses as shown in FIG. 7a, b, and c.
8' and 18'' are selected and installed according to the soil quality of the submarine soil 4, so that it can be appropriately adapted to various soil types.

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 cutters of the present invention is constructed as described above, in order to perform seabed dredging work, 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 adjustment plate 1
8 is not attached, the posture stabilizing sled 14 is seated on the seabed in a straight line, and the hydraulic motor 16 is operated to rotate the cutter 13, thereby excavating the seabed soil 4' to a deep excavation depth t1.

In addition, when dredging hard seabed soil 4'', as shown in FIG.
At this time, the cutter 13 rotates around the hinge 17 and moves upward, allowing shallow excavation. Excavation of seabed soil 4'' is performed to a depth t2.

In addition, the above-mentioned excavation depth adjustment plates 18, 18', 1
Of the 8'', the thickest adjustment plate 18'' was formed on the hardest soil, and the medium thickness adjustment plate 18' was formed on the medium hard soil, and the thinnest. The adjusting plate 18 is used for slightly hard soil. By the way, since the excavation depth t2 of the hard submarine soil 4'' is the distance between the lower end of the sled 14 and the lower end of the cutter 13, the cutter 13 is moved upward using the excavation depth adjusting plates 18, 18', 18''. This makes it shallower than the excavation depth t1 of the cutter 13 in the soft seabed soil 4', and the hard seabed soil 4'' can be excavated without any trouble.

In this way, by changing the excavation depth according to the hardness of the seabed soil, the load on the cutter 13 is kept almost constant, and the power of the drag head with the cutter is effectively utilized, resulting in efficient excavation and dredging. can be done.

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 main body, and a drive mechanism for the cutter, and a cutter for adjusting the depth of excavation of the cutter is provided. It has a simple structure in which an extending excavation depth adjustment plate is detachably installed, and the thickness of the adjustment plate gradually increases in the vertical direction from the front end to the rear end, and the depth adjustment plate is designed to adjust the depth according to the soil quality of the seabed. There is also the advantage that the excavation depth of the cutter can be easily adjusted, and the power of the drag head device with the cutter can be effectively utilized to efficiently carry out the dredging work.

[Brief explanation of the drawing]

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 vertical cross-sectional view showing the improved drag head device with cutters, FIG. 4 is a longitudinal cross-sectional view showing the improved device in FIG. 3, and FIGS. Figure 5 is a side view of the device at a deep excavation depth, Figure 6 is a side view of the equipment at a shallow excavation depth, and Figures 7a, b, and c are all from this book. FIG. 3 is a perspective view showing an excavation depth adjusting plate in an embodiment of the invention. 1...Hopper, 2...Drag arm, 3...
Drag head, 4... Seabed soil, 4'... Soft seabed soil, 4''... Hard seabed soil, 13... Seabed excavation cutter, 14... Sled for posture stabilization, 15... Inlet member, 16 ... Hydraulic motor as a drive mechanism, 17 ... Hinge, 18, 18', 18'' ... Excavation depth adjustment plate, 19 ... Drag head case, 2
0... Drag head body, t1, t2... Excavation depth of cutter.

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. A cutting cutter and a driving mechanism for the cutting cutter are provided, and in order to adjust the digging depth of the cutting cutter, a digging depth adjusting plate extending in the front and back direction along the lower surface of the sled is detachably provided. A drag head device with a cutter, characterized in that the adjustment plate is formed so that its thickness in the vertical direction gradually increases from its front end to its rear end.