JPH04174189A - Core sampler for seabed - Google Patents

Abstract

PURPOSE:To make the sampling of seabed easier by a method in which a drill, a nozzle propeller, and a core barrel are integrally connected, and a sample of seabed is packed into the inner tube of the core barrel of a double tube type. CONSTITUTION:A sampler 1 consists of a guide frame 2, a drill head 3, a nozzle propeller 4, and a core barrel 5. The head 3 is attached with a motor 7 and a reduction gear 8 and is allowed to move vertically The propeller 4 is fixed to the upper part of the motor 7 and the barrel 5 is attached to the lower part. A cylindrical cover is attached to the outside of the outer tube of the core barrel 5 of a double tube type and fixed to the head 3, and a core lifter and a spring bucket are provided to the tip of the inner tube. A specimen sampled is packed into the inner tube of the core barrel 5. Solid or unsolidified specimen can thus be optionally sampled.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seabed core sampling device for collecting materials such as sand and mud, cobalt-rich crust, and bedrock from the seabed surface layer in order to investigate the seabed surface layer. .

[Prior Art] A device disclosed in Japanese Utility Model Publication No. 2-30548 has been proposed as a device for excavating soil or bedrock on the seabed or deep underwater and collecting materials from the excavation.

As shown in FIG. 6, this submarine drilling device 31 is lowered from a mother ship 32 via a crane 33 and an umbilical cable 34 and is seated on the seabed (S).
As shown in FIG. 7, by driving the prime mover 35, the excavation tube 37 is rotated via the gear device 36, and at the same time, the propeller 39 disposed on the same axis as the excavation tube 37 is rotated via the reversing gear device 38. drilling tube 37
This propeller 3 is rotated in the opposite direction to the rotation direction of
9 is applied to the excavation tube 37, and at the same time, the rotational reaction force of the excavation tube 37 and the rotational reaction force of the propeller 39 are canceled out to prevent the rotation of the pedestal 40.

[Problems to be Solved by the Invention] However, there are two types of seabed materials: unconsolidated and consolidated materials, and it is difficult to collect materials using only the drilling tube 37 like the conventional submarine drilling device. Unconsolidated materials cannot be collected because the unconsolidated materials that should be collected are washed away by the drilling fluid, and the drilling hole collapses and cannot be collected properly. Furthermore, if the conventional excavation tube 37 is used alone, the material filled in the excavation tube 37 will fall out during the rotation of the excavation tube 37 when it is pulled up or until it is pulled up to the mother ship 32. Furthermore, with just the conventional excavation tube 37,
In view of these points, it is an object of the present invention to provide a seabed core sampling device that solves the above-mentioned drawbacks. This is the purpose.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a drill head that is provided vertically movably along a guide frame erected on a base, and a drill head that is attached to a rotating shaft of the drill head. The core barrel includes an outer tube fixed to the rotating shaft of the drill head, and an inner tube held in a swivel structure by the outer tube. A double tube type core barrel with a tube, a bit is provided at the tip of the outer tube, a core lifter is provided at the tip of the inner tube, and a spring basket is provided inside the tip of the inner tube. The structure according to claim (1), wherein a cylindrical cover is fixed to the drill head and provided on the outside of the core barrel, and claim (2), characterized in that the drill head is provided with an electromagnetic stopper.
), and the structure of claim (3), wherein the drill head is composed of a motor and a speed reducer, and the speed reducer is of a ratchet type and transmits power to the core barrel during forward rotation, but does not transmit power during reverse rotation; The drill head comprises a motor and a speed reducer, the speed reducer is of a sealed type filled with oil for pressure balance, and the speed reducer is equipped with a pressure balance mechanism.
The configuration of claim 4), wherein a sensor is provided at the upper and lower limits of the core barrel, and the sensor detects the movement of the core barrel to advance, retreat, and stop; and the rotation of the motor increases or decreases in accordance with the digging resistance of the bit. This is the configuration according to claim (6).

[Production use] The drill head moves up and down along the guide frame.

The nozzle propeller and core barrel are rotated by the drill head motor. The core barrel is propelled by a nozzle propeller. Since the core barrel is rotated and propelled into the soil and rock of the ocean floor, the material is forced into the inner tube that forms the core barrel and is filled. The material inside the inner tube is firmly held by the core lifter and spring basket.

[Example] Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is a perspective view showing an embodiment of the present invention, and shows the entire submarine core sampling device 1. As shown in FIG. This seabed core sampling device 1 includes a guide frame 2.2, a drill head 3 that is movable up and down along the guide frame 2.2, and is propelled by a nozzle propeller 4, and is attached to the rotating shaft of the drill head. It consists of a core barrel 5.

Reference numeral 6 denotes a base having a notch 6a serving as a passage for the core barrel 5, a pointed support leg 27 is provided on the seabed, and the guide frame 2.2 is erected on the upper surface facing the base 6. ing.

The drill head 3 is composed of a motor 7 and a speed reducer 8, and is mounted to be movable up and down along the guide frames 2, 2, and is usually fixed to the upper end of the guide frame 2 with a stopper 9. There is. The stopper 9 is
For example, as shown in FIG. 2, a knock bottle 10 that is released by a solenoid 11 is biased by a spring 12 and the drill head 3 is
One example is one that is fitted into a bottle hole in the side wall of the A nozzle propeller 4 is fixed to the upper output shaft of the motor 7, and a core barrel is provided to the lower output shaft via a speed reducer 8 having a ratchet gear. The speed reducer 8 is a sealed type filled with oil for pressure balance, and 1
3 is its pressure balance mechanism. The pressure balance mechanism 13 has a diaphragm 15 sealed inside a case 14 as shown in FIG. 3, and applies hydraulic pressure to the inside of the diaphragm 15 and external pressure to the outside. Further, since the speed reducer 8 has a ratchet gear, it is a mechanism that transmits power to the core barrel 5 during forward rotation, but does not transmit power during reverse rotation.

The nozzle propeller 4 includes a propeller 4a rotated by a motor 7 and a nozzle 4b, and propels the drill head 3 and core barrel 5. Regarding the movement of the drill head 3 and core barrel 5, proximity switch sensors 30a and 30b are provided at the lower and upper limits.
It's about to be controlled.

The core barrel 5 is fed by increasing or decreasing the rotation of the motor 7 according to the drilling resistance of the bit 21 of the core barrel 5, thereby increasing or decreasing the feeding of the core barrel 5. It is preferable to prevent an unreasonable load from being applied to the bit 21, and a conventionally known method is used as this means.

As shown in FIGS. 4 and 5, the core barrel 5 includes an outer tube 16 that is fixed to the rotating shaft 3a of the drill head 3 and rotates, and an inner tube 17 that is held by the outer tube 16 and a swivel structure 18.
A non-rotating cylindrical cover 19 that covers the double-tube core barrel is fixed to the drill head 3 with screws 20 on the outside thereof. A bit 21 is provided at the tip of the outer tube 16, a core lifter 22 is provided at the tip of the inner tube 17, and a spring basket 23 is provided inside the tip of the inner tube 17. ing. The spring basket 2
3, a large number of elastic pieces 23a are bent and biased from the inner wall of the inner tube 17, and the material pushed into the inner tube 17 against the elastic pieces 23a is pushed into the inner tube 17. This prevents it from falling out from inside.

This spring basket 23 is effective when the collected material is soft, but if it is hard, there is a risk that the material may slip off, so in this case the core lifter 22 is activated to prevent the material from falling out from inside the inner tube 17. ing.

This core lifter 22 has a ring shape with a slit cut out at one point so that it can contract and expand in the diametrical direction, and the outer peripheral side surface is tapered and fits into the tapered surface 17a at the lower end of the inner tube 17. When the outer tube 16 is rotated and fed to cut a sample, it rises slightly as shown on the right side of FIG. 5, so the tapered surfaces are disengaged and the inner diameter of the core lifter 22 expands, allowing the sample to pass through without resistance.

However, the core lifter 22 has finished cutting the sample and the outer tube 1
When the core 6 is pulled up, it descends and fits into the Taber surface 17a as shown on the left side of FIG. ing.

Further, a spiral screw 24 is provided on the outer circumferential side of the outer tube 16, and the rotation of the outer tube 16 causes the outer tube 1 to rotate.
The gap between the cylindrical cover 19 and the cylindrical cover 19 is used as a waterway to send seawater to the tip bit 21 side. It is designed to be washed from the outside. This water flow also serves to lower the pressure in the inner tube 17 into which the specimen enters, making it easier for the specimen core to enter. Above the double-tube core barrel, there is a through hole 25 and a cylindrical cover 1.
A through hole 26 is bored in 6 and serves as an inlet and outlet for seawater.

Incidentally, a storage battery chamber 28 and a control chamber 29 containing a control device are provided on the base plate 6, so that a power source can be supplied and the device can be controlled.

Next, the operation of the embodiment will be described. First, the seabed core sampling device 1 is installed sitting on the seabed. This installation is carried out by transporting the data to the data collection point using a remotely controlled vehicle, or by suspending it from the mother ship.

Then, when the stopper 9 is released and the motor 7 is started, the core barrel 5 is rotated and propelled by the rotation of the nozzle propeller 4, and enters the strata of the seabed.

During this approach, the inner tube 17 of the core barrel 5 is filled with materials such as sand and mud from the surface layer of the seabed, cobalt-rich craft, and bedrock. At this time, since a cylindrical cover 19 is provided on the outside of the core barrel 5, the hole is maintained so that the hole does not collapse during excavation, and the material can be collected in columnar form without spilling unconsolidated material. In addition, the inner tube 17 of the core barrel 5
Since a core lifter 22 and a spring basket 23 are provided at the tip of the inner tube 17, the sample collected inside the inner tube 17 will not fall out. In particular, since the inner tube 17 constituting the core barrel 5 is held by the swivel structure 18 with respect to the outer tube 16, vibrations caused by rotation of the outer tube 16 etc. are not transmitted to the inner tube 17. The collected material does not fall off.

Next, when the core barrel 5 enters a certain range (set range), it is detected by the sensor 30b and stops, and the nozzle propeller 4
is rotated in the opposite direction and the core barrel 5 is pulled out. When the upper limit is reached, it is detected by the sensor 30a and stopped, and the stopper 9 is activated. When the core barrel 5 is pulled out, the core barrel 5 is not driven and does not rotate because the speed reducer 8 is of a ratchet type.

The drive source of the nozzle propeller 4 is shared with the drive source (motor 7) of the core barrel 5, but this may be provided separately.Also, the stopper 9 is an electromagnetic knock bottle 10.
However, other known means such as an electromagnetic shoe may also be used.

Moreover, the sensors 30a and 30b may be limit switches.

Furthermore, although the above embodiments have been described with respect to sampling from the seabed, it goes without saying that the present invention may also be applied to sampling from deep underwater.

[Effects of the Invention] As explained above, according to the present invention, materials in both unconsolidated and consolidated states can be held and collected in the core barrel, and a cylindrical cover is provided with a hole on the outside of the core barrel. Since the holes are kept to prevent collapse, materials can be collected reliably. Further, according to the present invention, even if there are soft sand and mud, hard rock, and cobalt-rich craft, these can be collected in columnar form all at once. Moreover, the material collected with the core barrel can be reliably collected without falling out of the core barrel.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is a sectional view of the stopper, FIG. 3 is a sectional view of the pressure balance mechanism, and FIG. 4 is a core barrel. 5 is a sectional view of the lower half of the core barrel, FIG. 6 is a schematic perspective view showing a conventional example, and FIG. 7 is a front view showing details thereof. DESCRIPTION OF SYMBOLS 1... Seabed core sampling device, 2... Frame, 3... Drill head, 4... Nozzle propeller, 5... Core barrel, 6... Base, 7
...Motor, 8...Ratchet type reducer, 9...Stopper, 1
3...Pressure balance mechanism, 16...Outer tube, 17...
- Inner tube, 19...Cylindrical cover, 30a, 30b-sensor. Utility model registration applicant: Koken Kogyo Co., Ltd. Figure A'1

Claims (6)

[Claims] (1) A drill head provided vertically movably along a guide frame erected on a base, a core barrel attached to the rotating shaft of the drill head, and a nozzle propeller that provides propulsive force to the drill head and core barrel. The core barrel is a double-tube core barrel consisting of an outer tube fixed to the rotating shaft of the drill head and an inner tube held by the outer tube in a swivel structure, and a bit is attached to the tip of the outer tube. A core lifter is provided at the tip of the inner tube, a spring basket is provided inside the tip of the inner tube, and a cylindrical cover is provided outside the double tube type core barrel and is fixed to the drill head. A submarine core sampling device characterized by: (2) The submarine core sampling device according to claim 1, wherein the drill head is provided with an electromagnetic stopper. (3) The drill head is composed of a motor and a speed reducer, and the speed reducer is of a ratchet type and transmits power to the core barrel during forward rotation, but does not transmit power during reverse rotation.
) or the seabed core sampling device according to claim (2). (4) The drill head is composed of a motor and a speed reducer, the speed reducer is of a sealed type filled with oil for pressure balance, and the speed reducer is equipped with a pressure balance mechanism. The seabed core sampling device according to any one of claims 1) to (3). (5) The submarine core according to any one of claims (1) to (4), wherein a sensor is provided at the upper and lower limits of the core barrel, and the core barrel is detected by the sensor and advances, retreats, and stops. Sampling equipment. (6) Claim (1) characterized in that the rotation of the motor is configured to increase or decrease depending on the digging resistance of the bit.
The seabed core sampling device according to claim 5.