JPH07116704B2 - Gun type core sampling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is applied not only to formations near the ground surface such as the seabed and bedrock, but also to efficient sampling of samples from above-ground concrete walls and the like. A mechanical sampling device.

[Conventional technology]

5 and 6 are examples of a conventional gun-type core sampling device, and FIG. 5 is an overall perspective view and a sixth example.
The figure shows the exploded view of FIG.

Sampling devices near the surface layer such as the seabed include a dredging method for towing and excavating a bucket on the seabed, a grabber method for shovel-clamping the seabed surface, and a drilling method for screwing a tube with a rotary motor. And there are some difficulties in terms of efficiency. The most similar recent examples are FIGS. 5 and 6.
There is a core gun unit shown in the figure.

In the figure, the core barrel 05 to be sampled is fired from the body 02 to the sampling target by the action of the igniter 03 or the like. The fired core barrel 05 sinks into a solid rock and stops. Recovery cable
Simultaneously with the launch, 07 is disengaged from the upper part of rod 08 and stopped by stop yoke 06. The core barrel 05 from which the sample is finally collected is collected in a form hanging from the elastic cord 01.

Reference numeral 04 denotes a core tube provided on the outer periphery of the core barrel 05.

Reference: OTC'86 Promeading OTC5232 "" Reselopment of am Advanced Sampling Devicefor th
e Investigation of Marine Ferromanganece Crust Dep
osit "[Problems to be solved by the invention] However, the conventional gun type core sampling device is
There were the following problems, which mainly deteriorated the reliability of sampling and the sample quality.

(1) Since a large blast force due to explosive force is required, if the core barrel does not hit a hard layer within a predetermined depth, the recovery cable 7 or the like may be broken and may not be recovered. In many cases, this is rather the case, and as a result the sampling efficiency is poor.

(2) Since the core barrel is a sealed type, the internal pressure increases as the sample invades, hindering smooth capture, and at the same time, the sample composition and size may change, deteriorating the sampling quality.

The present invention is intended to solve the above problems,
It is an object of the present invention to provide a gun-type core sampling device capable of improving the reliable sampling rate and sample quality.

[Means for solving problems]

Therefore, the gun type core sampling device of the present invention is
A firing casing fitted and fixed to the inner center of a core tube erected on the sampling target stratum, a core barrel attached vertically to the lower end of the launch casing for sampling the stratum, and a core barrel in the launch casing. A core barrel internal pressure relief mechanism provided at the top,
Through the firing casing, one end is connected to the upper part of the core barrel, and the other end is located inside the core tube and above the launch casing so as to enable selection or recovery of the rush amount of the core barrel. It is characterized by comprising a plurality of ultra-high-strength spokes connected to a plunge stop plate arranged so as to be able to stop.

[Work]

With the above configuration, the core barrels can be connected by multiple ultra-high tension spokes, and the advance of the core barrels can be stopped by the plunge stop plate provided at the end of the ultra-high tension spokes with a constant plunge stroke into the formation. By pulling the stop plate back to its original position, the core barrel can be collected easily and reliably.

〔Example〕

1 to 4 show an embodiment of a gun type core sampling device of the present invention. FIG. 1 is a perspective view showing a part of the gun type core sampling device according to the first embodiment, and FIG. FIG. 3 shows a sectional view for explaining the figure. FIG. 3 is a second embodiment of the present invention, and is an overall perspective view using a heat resistant rubber check valve for pressure relief against the internal pressure of the barrel, and FIG. 4 is a partial sectional view of FIG. .

As shown in the figure, the core barrel 1 has an explosive 7 inside,
The release hole 10 is fitted into the firing casing 5 having the detonator 6 at its upper portion in a mold covered with the barrel plug 2a, and is prepared.

The barrel plate 2a is formed so as not to be tilted by a guide rod 3a that penetrates the upper portion of the core barrel 1, and the barrel plate 2a, the release hole 10 and the guide rod 3a.
The pressure relief mechanism inside the core barrel is formed by a and.

Further, the core barrel 1 penetrates the firing casing 5 by the super high-strength spokes 8 (three in this example), and forms a link by the stopper plate (rush stop plate) 9 at the upper part.

The firing casing 5 is assembled to the core tube 4 with screws 16 or the like. The whole unit of the core tube 4 is structured to be fitted into a hole of a main body device (usually a device shelf) 11 or the like, and a lower portion thereof penetrates a dilution sediment (a sediment layer such as a sediment having a low specific gravity) 13. The structure is grounded to the sampled geological formation 14 or 15.

When the detonator 6 is mechanically or electrically operated by the trigger lifter 12 or the like which is an auxiliary device, the core barrel 1
Plunges into formations 14 and 15. At this time, the Barrel plates 2a and 2b are
The connecting rod 3 automatically increases when the internal pressure of the core barrel 1 increases.
Within the range permitted by a and 3b, the release hole 10 is kept open, seawater or diluted sediment 13 is discharged to the outside of the core barrel 1, and the target formations 14 and 15 are captured in the core barrel 1.

Further, when the stopper plates 9a, 9b are pulled back (raised) for recovery by the trigger lifter 12 etc., the barrel barrel closing plate 2b automatically blocks the upper portion of the core barrel 1, and the core barrel 1 of the formations 14, 15 sampled by the back pressure generated. It is possible to prevent outflow and fall from inside.

Since the core tube 4 as a whole is independent of the main body device 11, the reaction force due to the explosive firing is supported by the inertia (weight) of the entire barrel unit and slightly moves, so that the main body device 11 is not adversely affected. It is a structure that does not give.

Further, FIGS. 3 and 4 showing the second embodiment show an example in which a check valve 30 made of a heat-resistant elastic rubber sheet is used as a pressure relief mechanism in the core barrel.

An appropriate number of holes are provided in the upper part of the core barrel 1, and the check valve 30 is attached to the stopper 31 and the bolt 32. As a result, after the core barrel 1 is fired, the check valve 3 increases due to the increase in internal pressure that accompanies the entry of the core barrel 1 into the sampling target formations 14 and 15.
When 0 opens, seawater in the core barrel 1 or diluted sediment 13 flows out upward, and the sampling target formations 14 and 15 in the core barrel 1 are smoothly collected.
Further, the hole above the core barrel 1 is closed by the check valve 30 when the core barrel 1 is pulled up, and the sampled formations 14 and 15 in the core barrel 1 are prevented from falling.

〔The invention's effect〕

 The present invention has the following effects.

Since the core barrel and the core tube body are connected by the multiple ultra-high-strength spokes and the plunge stop plate, the core barrel, that is, the sampling target stratum can be reliably recovered.

By providing a core barrel internal pressure relief mechanism at the upper end of the core barrel, the core barrel can be smoothly inserted into the sample formation, improving sampling quality and increasing the sample collection rate by the back pressure that is automatically generated during collection.

With these ideas, efficient sampling can be realized for the entire device.

[Brief description of drawings]

1 to 4 show an embodiment of a gun type core sampling device of the present invention. FIG. 1 is a perspective view showing a part of the gun type core sampling device according to the first embodiment, and FIG. FIG. 3 shows a sectional view for explaining the figure. FIG. 3 is a second embodiment of the present invention, and is an overall perspective view using a heat-resistant rubber check valve for pressure pressure against a barrel internal pressure, and FIG. 4 is a partial sectional view of FIG. 5 and 6 show an example of a conventional gun-type core sampling device, FIG. 5 is an overall perspective view thereof, and FIG. 6 is an exploded view of FIG. 1 ... Core barrel, 2a, 2b ... Barrel cover plate, 4 ... Core tube, 5 ... Firing casing, 8 ... Super high-strength spoke, 9a, 9b ... Stopper plate.

Claims (1)

[Claims] 1. A launch casing fitted and fixed to the inner center of a core tube erected on a sample formation, a core barrel attached vertically to the lower end of the launch casing for sampling the formation, In order to enable selection or recovery of the thrust amount of the core barrel, which penetrates the core barrel internal pressure relief mechanism provided on the core barrel in the firing casing and penetrates the firing casing, and connects one end to the upper portion of the core barrel. A gun-type core sampling device comprising: a plurality of ultra-high-strength spokes connected to a plunge stop plate that is arranged to be able to stop inside the core tube above the firing casing.