JPH0140184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drilling ship that excavates materials such as soil and sand on the seabed and carries them to the surface.

As such drilling ships, there are pump ships that cut off the earth and sand from the seabed with cutters and suck it up with pumps, and grab ships that grab up the earth and sand from the seafloor with grab buckets, which are currently in operation.
These known drilling vessels (1) have difficulty collecting mud, (2) tend to muddy the ocean area due to seabed agitation, (3) produce a large amount of sewage, and (4) have uneven excavation sites. is likely to occur,
It has various drawbacks such as:

Therefore, the main object of the present invention is to eliminate the above-mentioned drawbacks of conventional drilling vessels.

To achieve this objective, the invention includes a conveyor device reaching from near the bottom of the water to the top of the water;
In a drilling ship having a drilling tool attached to its bottom side, the conveyor device is attached to and movable with a drilling truck that can move back and forth in at least one direction on the drilling ship, and the conveyor device Means for varying the angle of inclination of the conveyor device, arranged to extend obliquely from near the bottom of the water to above the water, is disposed between the conveyor device and the excavation truck, the means being arranged to extend obliquely from near the bottom of the water to above the water, the means for changing the angle of inclination of the conveyor device being disposed between the conveyor device and the excavation truck, the means for changing the angle of inclination of the conveyor device so that the conveyor device extends over substantially its entire length. comprising a tubular body extending across the body and a conveyor body extending within the tubular body from near the bottom of the water to above the water, the excavating tool being attached to the tubular body and at least partially open toward the bottom of the water; a casing and two screw vanes arranged in series within said casing for rotation in the same direction about a common axis, said screw vanes at least partially A drilling ship, characterized in that the bottom side end of the conveyor body is exposed toward the bottom of the water from the casing and is located near the middle of the two screw blades.
is provided.

In this, the conveyor body is preferably a screw blade.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, and the characteristics and advantages of the present invention will be clarified.

Embodiment 10 of a drilling ship according to the invention, shown in side view in FIG. 1 and in perspective view in FIG.
and 10b configured as a catamaran.
The drilling ship 10 has two pillars 11a and 11b in the front and rear,
11c and 11d (11d is not shown), and each pedestal is connected to the main body 1 of the drilling ship by a hydraulic jack 12.
It can be raised and lowered relative to the main bodies 10a and 10b, and can be tilted relative to the main bodies 10a and 10b by means of a hydraulic cylinder 13. These members 11a-11d, 12, 13
constitutes a fixed/walking device for the drilling ship 10, but the details thereof are well known and will not be explained here. In the drawings, reference numeral 14 indicates a control room or the like constructed so as to straddle both the trunks 10a and 10b.

Longitudinal extending rails 15a and 15b are laid on the decks of the shells 10a and 10b, and the excavation truck designated by the reference numeral 16 has rails 15a and 15b.
It can be moved back and forth along the line and can be placed in any suitable position.

The conveyor assembly 17, which extends diagonally downward from the rear to the front between the shells 10a and 10b, can reach near the seabed 18 at its front end, bends downward at its rear end on the ship, and connects to the excavation truck 16 with a pivot 19. It is pivotally mounted. Actuation of the hydraulic cylinder 20 allows the conveyor assembly 17 to be lifted about the pivot 19 to a position 17a above the water, shown in phantom. Although not shown, the conveyor assembly 17 is preferably provided with a ballast tank whose buoyancy can be adjusted, for example, at its front end to facilitate its movement and retention in a predetermined position. drilling ship 1
When 0 moves a lot, the conveyor assembly 17
is held at such a position 17a above the water.

Screw conveyors 21a and 21b are accommodated in the conveyor assembly 17 as conveyor devices, extending in the longitudinal direction from the front end approximately to the bending point. Screw conveyor 21a, 21
As is well known, screw blades 23 (Fig. 3) are rotatably arranged as a conveyor body in a pipe or tubular body 22, and when the screw blades are rotated, the transported object is moved along the screw surface. Sent. In the case shown, the screw blades are screw conveyors 21a, 2.
It is rotated in a direction of rotation that can achieve feeding from the lower front end to the upper rear end of 1b.

Attached to the front or bottom end of the conveyor assembly 17 is an excavator 24 having a trapezoidal casing 25 connected to the conveyors 21a, 21b. The excavating tool 24 further includes screw blades 27a, 27b, 27c, and 27d fixedly attached in this order to a rotating shaft 26 coaxial with the casing 25.
(Figure 3). In the illustrated example, the screw blade 27a
and 27c are twisted to the left, screw blades 27b and 27d
twists to the right. Also, screw blades 27a, 27b,
27c and 27d are shown as being connected together. In this case, the rotating shaft 26 is rotated counterclockwise when viewed from the left end to the right end in FIG.

As shown in FIG. 1 and FIG.
When the front end of the conveyor assembly 17 is lowered until the conveyor assembly 17 contacts the seabed and the rotating shaft 26 is rotated as described above using a suitable drive device, the screw vanes 27a, 27b, 27c, 2 exposed from the casing 25 are removed.
Components of the seabed, such as soil and sand, are excavated by the portion 7d. This excavated seabed structure is simultaneously raked into the area 28a between the screw blades 27a and 27b and the area 28b between the screw blades 27c and 27d by the feeding action of the screw blades similar to a screw conveyor.

As shown in FIG. 3, conveyors 21a and 21b have their front or receiving ends located at area 28
It is arranged so that it opens at a and 28b, respectively. The seabed components scraped into areas 28a and 28b are thus conveyed by screw conveyors 21a and 21b to the upper rear ends of these conveyors. Disposed on the deck of the drilling ship 10 is a delivery conveyor 29, for example, a screw conveyor, which extends laterally from just below the rear ends of these conveyors and transports objects in the direction of this extension. Therefore, if a conveying means such as a small transport line (not shown) is arranged below the sending end 30 of this sending conveyor 29, the seabed components will fall from the rear end of the conveyors 21a, 21b and be received by the sending conveyor 29. and thereby reach the delivery end 30 and then fall into the small boat. The excavation work using the excavation tool 24 described above is generally performed while the excavation truck 16 is moved along the rails 15a and 15b with the excavation ship stationary. Thus the vast ocean floor 18
excavation is achieved.

Since the drilling ship according to the present invention is constructed as described above, it has the following characteristics and advantages.

(1) In addition to being able to move in water by a tugboat or its own power, fixed/walking devices 11a-
d, 12, and 13 allow for walking movement. Furthermore, this fixing/walking device allows it to be fixed at a desired location.

(2) Since the excavating cart 16 is moved while operating the excavating tool 24 in a stationary state, extensive excavation of the seabed 18 can be achieved as shown in FIG.
At this time, the roughness of the excavation trace is extremely small.

(3) Excavated soil, sand, etc. are located in areas 28a and 28b.
Since the water is scraped up by the water and then conveyed to the water by conveyors 21a and 21b, it is difficult for the ocean to become cloudy due to agitation of the ocean floor.

(4) Since the screw blades 27a to d of the excavator 24 themselves have a feeding action, mud can also be collected.

(5) By adjusting the feed of the conveyors 21a and 21b, it is possible to substantially prevent water from being carried up, and therefore the amount of waste water discharged is small.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing an embodiment of the drilling ship of the present invention, FIG. 2 is a perspective view schematically showing the drilling ship of FIG. 1, and FIG. 2 is a diagram schematically showing the arrangement of parts of the drilling tool of the drilling ship shown in FIGS. 1 and 2; FIG. In the drawing, 18 is the bottom of the water, 21a and 21b are conveyors, 24 is an excavation tool, 25 is a casing, and 2
7a, 27b, 27c, and 27d indicate screw blades.

Claims (1)

[Claims] 1. In a drilling ship having a conveyor device that reaches the water surface from near the water bottom, and a drilling tool is attached to the water bottom side, the conveyor device is attached to a drilling cart that can move back and forth in at least one direction on the drilling ship. The conveyor device is mounted and movable therewith, and the conveyor device is arranged to extend diagonally from near the bottom of the water to above the water, and means for changing the angle of inclination of the conveyor device is arranged between the conveyor device and the excavation truck. and the conveyor device comprises a tubular body extending over substantially its entire length, and a conveyor body extending from near the bottom of the water to above the water within the tubular body, and the excavator is attached to the tubular body. a casing mounted and at least partially open towards the bottom; two screw vanes arranged in series within said casing for rotation in the same direction about a common axis; wherein the screw blade is at least partially exposed from the casing toward the bottom of the water, and the bottom side end of the conveyor body is located near the middle of the two screw blades; A drilling ship featuring