JPS5837456B2 - Wheel type underwater drilling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheel-type underwater excavation device for excavating the bottom of an ocean floor or the like.

BACKGROUND ART Conventionally, a wheel type underwater excavation device for excavating the underwater bottom has usually had a drive shaft 3 at the center of rotation of an excavation wheel 2 having a blade 1 on the outer periphery, as shown in FIG.

However, such an apparatus has a drawback that, when the diameter of the excavation wheel 2 is D, it is only possible to excavate to a depth of D/2.

Conventionally, in order to excavate to a depth of D, the diameter of the excavating wheel 2 had to be 2D, which had the drawback of increasing the size of the device and increasing the cost.

Furthermore, as another type of underwater excavation device, an underwater excavation device called a trencher set as shown in FIG. 2 has been proposed.

This excavation device has a structure in which an endless chain 6 is stretched between a driving wheel 4 and a driven wheel 5 that are rotatably supported at a distance, and a cutter 7 is attached to the chain 6.

However, the device having such a structure has the drawback that there are many failures such as breakage of the chain 6, and the range of bottom sediment that can be excavated is at most soft rock, and the range of bottom sediment that can be excavated is narrow.

An object of the present invention is to provide a wheel-type underwater excavation device that can excavate to a depth greater than the radius of the excavation wheel and that can be used in a wide range of sediments that can be excavated.

A wheel type underwater excavation device according to the present invention includes a body that travels on the water bottom, a frame supported by the body and protruding downward from the body, and a frame arranged so as to protrude downward from the body and having a center of rotation. an excavation wheel rotatably supported by the frame and having an excavation blade on the outer periphery; internal teeth provided concentrically along the outer periphery of the excavation wheel; and the internal teeth at an upper side edge of the excavation wheel. and a drive shaft that supports the drive gear and imparts rotation/force to the drive gear, each lower portion of the frame on both sides of the excavation wheel being engaged with the excavation wheel. The excavation wheel is fitted into recesses on both sides of the excavation wheel so as not to protrude from both sides of the excavation wheel.

Embodiments of the present invention will be described in detail below with reference to the drawings.

3 to 5 show an example in which the wheel type underwater excavation device of the present invention is applied to a long body underwater burying device for burying a long body such as a cable in the water bottom.

The elongated body underwater burying device 8 of this embodiment has a twin-hulled ship-shaped body 10 that runs on an underwater bottom 9 such as the seabed, and a wheel-type excavator 11 is provided at the lower center of the body 10. .

This excavating section 11 has a pair of plate-shaped frames 12, 12 whose upper parts are supported at the lower part of the body 10, and has an excavating blade 13 on the outer periphery between the plate-shaped frames 12, 12. An excavation wheel 14 is arranged to protrude below the body 10.

The excavation wheel 14 is rotatably supported by both plate-shaped frames 12 and 12 via a bearing 15 at its center of rotation.

Internal teeth 16 are concentrically carved on the inner surface of the outer circumference of the excavating wheel 14 over the entire circumference, and a driving gear 17 is meshed with the internal teeth 16 at the upper side edge of the excavating wheel 14 .

The drive gear 17 is connected via a drive shaft 19 to a drive source 18 such as a motor supported by the plate-shaped frame 12 to rotate the excavation wheel 14.

An auxiliary gear 20 is rotatably supported on the plate-shaped frame 12 at an angle of 180 degrees with respect to the drive gear 17, and is meshed with the inner wheel 16 of the excavation wheel 14.

The recesses on both sides of the excavation wheel 14 having the inner wheel 16, drive gear 17, auxiliary gear 20, etc. are fitted in such a way that the circular lower portions of the plate-like frames 12, 12 do not protrude from the both sides. It is designed to prevent the intrusion of earth and sand, and to prevent excavation resistance from increasing due to protrusions.

A group of guide rollers 22 are provided at the top of the body 10 to guide a long body 21 such as a submarine cable or water pipe installed on the underwater bottom 9 backward through the top of the body 10 .

At the rear of the body 10, an elongate body guide 24 is provided that guides the elongate body 21 sent out via a group of guide rollers 22 into a groove 23 dug by an excavation wheel 14.

As shown in FIG. 6, such a long body underwater burying device 8 is towed by a work boat 25 via a tow rope 26, along with a long body 21 laid in advance on the water bottom 9. Run it on the water bottom 9.

At this time, the excavation wheel 14 is rotated by driving the drive source 18 to excavate the water bottom 9 to form a groove 23, and the elongated bodies 21 are guided into the groove 23 and buried one after another.

The material and shape of the excavating blade 13 of the excavating wheel 14 are changed depending on the hardness of the excavated object to improve work efficiency.

It is assumed that the body 10 has a weight and size that can sufficiently hold the reaction force of the excavation wheel 14.

Its shape is not limited to the bridge type shown, but may also be a track type like a bulldozer.

As explained above, in the wheel type underwater excavation device according to the present invention, internal teeth are provided along the outer periphery of the excavation wheel, and a driving gear is engaged with the internal teeth at the upper side edge of the excavation wheel. Since the rotational force is applied, the drive shaft is not at the center of the excavation wheel, but is located at the top of the excavation wheel. Therefore, the effective excavation length of the excavation wheel can be increased, and Can drill to great depths.

In particular, according to the present invention, the drive shaft is present in the upper part of the excavation wheel, and the lower portions of both frames supporting the excavation wheel are fitted into the recesses on both sides of the excavation wheel so as not to protrude from the both sides. Since there are no protrusions on both sides of the excavation wheel, excavation resistance can be reduced.

Moreover, according to the present invention, the drive gear meshes with the internal teeth provided along the outer circumferential edge of the excavation wheel, so that rotational force is transmitted to the excavation wheel. When the rotational force is transmitted, deceleration is performed, and as a result, the torque can be increased and the digging force can be improved.

Therefore, by changing the excavation blade of the excavation wheel, it is possible to excavate from sand to rock.

Furthermore, in the present invention, the digging wheel is provided with concentric teeth,
Since the structure is such that the driving teeth mesh with these teeth, it is more durable and has the advantage of being less likely to break down compared to systems that use chains or the like.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing two types of conventional underwater excavation equipment, FIG. 3 is a side view showing an embodiment of a long body underwater burying equipment to which the present invention is applied, and FIG. 4 5 are a vertical cross-sectional view and a partially cutaway side view of the excavation part of the apparatus shown in FIG. 3, and FIG. 6 is a side view of the apparatus shown in FIG. 3 in a working state. 9... Bottom of the water, 10... Aircraft, 11...
...Wheel type excavator, 12...Frame, 13...Drilling blade, 14...Drilling wheel, 15...Bearing, 16... ...teeth, 1
7... Drive gear, 18... Drive source, 1
9... Drive shaft.

Claims (1)

[Claims] 1. A body that travels on the underwater surface, a frame supported by the body and protruding downward from the body, and a frame arranged so as to protrude downward from the body, the center of rotation of which is rotatably supported by the frame, and which is located on the outer periphery. An excavation wheel having an excavation blade, internal teeth provided concentrically along an outer circumferential edge of the excavation wheel, a drive gear meshed with the internal teeth at an upper side edge of the excavation wheel, and the drive gear. and a drive shaft that supports the excavating wheel and applies rotational force to the first drive gear, and each lower part of the frame on both sides of the excavating wheel is arranged so that the lower parts of the frame do not protrude from both sides of the excavating wheel. A wheel-type underwater excavation device that is fitted into recesses on both sides of the wheel.