JPH07293182A - Core sampling method for seabottom ground - Google Patents

Abstract

PURPOSE:To set a core sampling device at a specific position of the object seabottom ground accurately, to carry out the sampling at an accurate position, and at the same time, to reduce the vessel operating burden and to recover the core sampling device easily. CONSTITUTION:This seabottom core sampling device 1 has buoyancy bodies 2 and 3, and a weight 4 demountably installed, and it is thrown into the sea from a main vessel. When it reaches the seabottom, it is maintained by a manipulator 21 provided to a submarine boat 20, and seated at a specific position. After that, the seabottom ground is excavated by the core sampling device 1 to pick up a sample, and after picking up the sample of the seabottom ground, the weight 4 demountably installed in the core sampling device 1 is disconnected, and the core sampling device is floated up by the buoyancy of the buoyant bodies 2 and 3, and recovered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core sampling method for collecting a sample of seabed.

[0002]

2. Description of the Related Art Conventionally, as a method of sampling the seabed, as shown in FIG. 4, an operating ship 1 is equipped with a seabed core sampling device 110 for excavating the seabed and collecting a sample thereof.
The cable 120 is hung from 00, the cable 120 is fed out by the operation on the operation ship 100, the seabed core sampling device 110 is seated at the excavation point, and then the excavation and sampling work are started to sample the seabed ground. After that, it is known that the seabed core sampling device 110 is recovered on the operation ship 100 by operating the cable 120.

[0003]

However, in the above-mentioned prior art, since the seabed core sampling device 110 is suspended from the ship by a cable or wire rope, the airframe is swept into the ocean current and tidal current, and sampling is required. Since it is difficult to settle at the exact point and the device 110 is always connected to the operation ship 100 via a cable, the operation ship can be used during excavation and sampling work of the seabed. It is necessary to stop the operation ship 100 against wind and tidal current so that the operation ship 100 is located right above the seabed core sampling device 110, which complicates the operation of the ship and when the operation ship is washed away. The submarine core sampling device 110 is pulled by the cable 120 and falls or is dragged, so that excavation and sampling work cannot be performed. There was a problem in that is.

Therefore, the submarine core sampling device 110
The cable was extended so that it would not fall over or be dragged by the cable 120. However, if the cable is extended too much, the cable may be entangled with an obstacle. .

The present invention has been made in order to solve the above-mentioned conventional problems, and enables accurate seabed ground sampling, reduces the burden of maneuvering vessels, and facilitates the recovery of the core sampling device. The purpose is to provide a sampling method for various seabeds.

[0006]

In order to achieve the above-mentioned object, a method for core sampling of a seabed according to the present invention comprises:
The submarine core sampling device is provided with a buoyant body and a detachably attached weight, and the submarine core sampling device is put into the sea from the ship, and when it reaches the sea bottom, it is held by a manipulator attached to the submersible and the predetermined weight is maintained. Sit at a position and then excavate the seabed by the core sampling device to collect a sample of it, and after collecting a sample of the seabed, separate the weight that is detachably attached to the core sampling device and then perform core sampling. It is characterized in that the core sampling device is levitated by the buoyancy of the buoyant body attached to the device and collected.

Further, the submarine core sampling device is provided with a buoyant body that can be partially detached and a weight that is detachably attached. The submarine core sampling device is put into the sea from the ship and equipped on a submarine when it reaches the seabed. This is held by the manipulator and seated at a predetermined position, and after separating a part of the buoyant body, the core sampling device is used to excavate the seabed ground to collect the sample,
After taking a sample of the seabed, separate the weight that is detachably attached to the core sampling device,
It is characterized in that the core sampling device is levitated by the buoyancy of the buoyant body attached to the core sampling device and collected.

[0008]

According to the present invention, the seabed core sampling device is put into the sea from the main vessel, and when it reaches the seabed, it is held by a manipulator equipped on the submersible and seated at a predetermined position to take a sample of the seabed ground. Therefore, it is possible to land on the exact sampling position of the target seabed ground,
No cable is required to connect between the main vessel (operating vessel) and the seabed core sampling device.

Therefore, according to the present invention, accurate sampling at sampling points can be performed, and while the seabed core sampling device excavates the seabed ground to collect a sample, the seabed core sampling device is the main ship (operating ship). Since the cable suspended from the ship is not connected, it is necessary to stop the ship (manipulation ship) against wind and current so that the ship (manipulation ship) is located directly above the seabed core sampling device. Absent.

Further, since the submarine core sampling device is provided with a buoyant body and a detachably attached weight, the submarine core sampling device can sink and sit on the seabed to collect a sample depending on the weight of the device and the weight. However, when the weight is cut off, the buoyancy of the buoyancy body exceeds the weight of the entire device, so the submarine core sampling device floats above the sea. Furthermore, if a part of the buoyancy body is detachable, the weight of the seabed core sampling device is increased and the sampling can be stabilized by sitting on the sampling point and then detaching a part of the buoyancy body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1, FIG. 2, FIG. 3 and FIG. 4 are front views showing an embodiment of the present invention, which are shown in the order of steps, in which 1 indicates a submarine core sampling device, and 10 indicates a main ship (operating ship).

The core sampling device 1 of the present invention comprises a buoyant body 2 and 3 and a detachably attached weight 4.
It is equipped with.

This submarine core sampling device 1 is put into the sea from the main vessel 10 (FIG. 1), and when it reaches the bottom 15 of the sea, it is held (FIG. 2) by a manipulator 21 mounted on the submersible 20 and put in place. After being seated, the core sampling device 1 is then used to excavate the seabed 15 and collect a sample thereof (FIG. 3).

After the sample of the seabed 15 is taken, the weight 4 detachably attached to the core sampling device 1 is detached, and the buoyancy of the buoyancy bodies 2 and 3 attached to the core sampling device 1 is applied to the core sampling device 1.
Is levitated (Fig. 4) and collected.

The submarine core sampling device 1 may be a marine drill type core sampling device which collects the seabed core by boring using one or more rotary core tubes having a bit at the tip. A gun-type sampling device that injects a sampler and collects a core may be used, and is not particularly limited.

The submarine core sampling apparatus 1 shown in the figure has a frame body 5 provided with a plurality of support legs 6 which are seated on the seabed 15.
The vertical drilling spindle 7 is arranged and this spindle 7
A motor 8 for rotating the motor is provided, a motor 9 for operating a hydraulic pump and a water pump for feeding and retracting the spindle 7 is installed on the frame 5, and a power storage battery for supplying power to the motor is installed on the frame 5. The core tube 1 that is built in the tank 11 fixed to the
In FIG. 2, the core sampling is performed by excavating by rotating or hitting to advance. In the present device 1, although not shown, a power supply switch is turned on to start a rotation motor 8 for the spindle 7, and then a motor 9 is started to start excavation. When the excavation is completed, the spindle is retracted. A control means for controlling so as to perform is provided.

The weight 4 can be detached by adsorbing the weight with an electromagnet and turning off the electromagnet to detach the weight 4, rotating the weight mounting table and dropping the weight. There may be mentioned a configuration in which the fixing is wrapped with a fixing piece operated by a solenoid and the fixing piece is opened by the solenoid and dropped.

After the end of sampling, the weight 4 is
The manipulator 21 of the submersible 20 is operated, ultrasonic command signals, timers, and the like are used for disconnection. As a result, the seabed core sampling device 1 obtains the buoyancy of the buoyancy bodies 2 and 3 and floats above the sea. After the ascent, the ship 10 collects this.

Further, examples of the buoyancy bodies 2 and 3 include a glass ball, a syntactic foam, a buoy made of aluminum or plastic, and the like. This buoyant body 2,
The buoyancy of 3 is set to be smaller than the weight of the main body of the seabed core sampling device 1 and the weight 4 and larger than the weight of the main body of the seabed core sampling device 1. Therefore, when the weight 4 is attached, it sinks to the seabed, but when the weight 4 is separated, it floats by the buoyancy of the buoyancy bodies 2 and 3.

The buoyant bodies 2 and 3 are plural in number, and an appropriate number of them, for example, one can be separated, the speed of subsidence in the sea is controlled, and the buoyant bodies are separated after being installed at a predetermined position on the seabed 15. The possible buoyant bodies may be detached so that they are of sufficient weight to be drilled underwater. The separated buoyant body is collected by the ship 10 at sea. The separation of the buoyant body is also performed by operating the manipulator 21 of the submersible 20, the command signal of ultrasonic waves, a timer and the like.

[0021]

As described in detail above, the present invention is
When the submarine core sampling device is put into the sea from the ship, and when it reaches the sea bottom, it is held by a manipulator equipped on the submersible and seated at a predetermined position, and sampling is performed, so the target sampling position of the submarine ground is accurate. It can be installed, and accurate sampling of points is possible. Further, a cable connecting between the ship and the submarine core sampling device is not required. Therefore, in the present invention, while the seabed ground is excavated by the submarine core sampling device and a sample thereof is taken, the ship (manipulation ship) It is not necessary for the ship to be stopped against wind and tides so that the ship is directly above the submarine core sampling device.

Further, since the cable suspended from the ship is not connected to the submarine core sampling device, the submarine core sampling device is pulled by the cable and falls, or is dragged and the excavation position shifts. Nothing.

Further, after the sampling is completed, the seabed core sampling device floats above the sea by the buoyancy of the buoyant body only by separating the weight, so that the collection is easy.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a front view of the next step showing the embodiment of the present invention.

FIG. 3 is a front view of a further next step showing the embodiment of the present invention.

FIG. 4 is a front view showing still another step of the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 Submarine core sampling device 2, 3 Buoyant body 4 Weight 10 Vessel 20 Submersible 21 Manipulator

Claims (2)

[Claims] 1. A submarine core sampling device comprises a buoyant body and a detachably attached weight, and the submarine core sampling device is put into the sea from the ship, and when it reaches the seabed, the submarine core sampling device is operated by the manipulator. And then sit at a predetermined position, and then excavate the seabed by the core sampling device to collect the sample, and after collecting the sample of the seabed, the weight detachably attached to the core sampling device. Disconnect
A core sampling method for submarine ground, characterized in that the core sampling device is levitated by the buoyancy of a buoyant body attached to the core sampling device and collected. 2. The submarine core sampling device comprises a buoyant body that can be partially detached and a weight that is detachably attached. The submarine core sampling device is put into the sea from the ship and equipped on a submarine when it reaches the seabed. After holding this by the manipulator which was carried out and sitting at a predetermined position and separating a part of the buoyancy body, after excavating the seabed ground by the core sampling device and collecting the sample, after collecting the seabed ground sample Detaches the weight detachably attached to the core sampling device,
A core sampling method for submarine ground, characterized in that the core sampling device is levitated by the buoyancy of a buoyant body attached to the core sampling device and collected.