JPH0376990A - Quadruple pipe type core tube sampler and sampling method using said sampler - Google Patents

Abstract

PURPOSE:To simplify sampling by installing an outer tube, an inner tube, an expansion sleeve mounted to a core elevator and a sample protecting tube having two-split structure and extracting a sample housed in the expansion sleeve from the inner tube together with the sample protecting tube. CONSTITUTION:A sampler is composed of an outer tube 10, an inner tube 12, a sample protecting tube 14 having two-split structure and an expansion sleeve 16. In the sleeve 16, a lower end is fixed to the inner tube 12, and another end is set up to a core elevator 24 capable of being elevated along a tube axis. The outer tube 10 is turned and driven, the ground is excavated by a metallic crown 18 at a nose, the ground is cut out by a cutting shoe 22 at the nose, and a sample is wrapped in the sleeve 16 and housed in the tube 14. The sleeve 16 is pushed out of the inner tube 12 together with the tube 14 in ground surface, and the tube 14 is split into two and the sample is extracted. Accordingly, the sample can be taken out simply under a sampled state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for collecting undisturbed samples of geological formations (various samples constituting the ground), and more specifically,
The present invention relates to a core tube sampler that collects a sample while being wrapped in an elastic sleeve, and to improvements in a sample collection method using the core tube sampler.

This technique is not particularly limited, but can be used, for example, to sample well-compacted sandy soil or hard viscous soil, to sample heterogeneous strata such as well-compacted hard soil or crushed rock, or to shallow ground surfaces. It is extremely useful for large-diameter sampling of cultural properties, geological formations containing fossils, and industrial waste.

[Prior Art] Devices with various structures have been developed and used in order to collect samples from geological formations without disturbing them. One of them is a triple core tube sampler that uses a core collection tube. This consists of an outer tube that has a metal crown at the tip and is connected to the drill rod at the rear end via a swivel head, and a shoe located inside the outer tube that is attached to the tip and the rear end is connected to the swivel head. It is equipped with an inner tube to be connected and a core collection tube made of metal or hard resin provided inside the inner tube.

The inner tube is non-rotatably coupled to the outer tube by a swivel head, and the rotating outer tube excavates the ground while storing the sample in the core collection tube in the inner tube.

However, with such a hard core collection tube, it is difficult to collect samples that are not disturbed depending on the condition of the strata.

Therefore, instead of the hard core collection tube mentioned above, some devices use an elastic sleeve. 1.An elastic sleeve is made of vinyl tube, etc., and is folded into a short length in advance, with one end fixed and the other end attached to the tube axis. attached to a core elevator that can be moved along. During sampling, the sample is covered with an elastic sleeve as it moves through the core tube and is stored therein.

[Issue to be Solved by the Invention 1fil] However, in the conventional elastic sleeve type triple-tube core tube sampler, the sample often becomes disturbed when it is taken out. In other words, when removing a sample, force is inevitably applied directly to the elastic sleeve containing the sample, which often results in unstable sample quality and adversely affects test results. In addition, the sample may be deformed or disturbed during transportation, such as when the sample is taken out and then placed in a shipping box.

An object of the present invention is to provide a sampler that eliminates the drawbacks of the prior art as described above and allows a sample stored in a core tube to be taken out easily and intact, and a sample collection method using the sampler. It is in.

[Means for Solving the Problems] The present invention, which can solve the above-mentioned technical problems, is a quadruple tube type core-chave sampler, which includes: (a) a metal crown is attached to the front end, and a metal crown is attached to the rear end; an outer tube coupled to the swivel head, (located inside the suburban tube, a canting shoe is attached to the tip, and coupled to the swivel head at the rear end so as not to rotate with respect to the outer tube; +C+ a telescopic sleeve located inside the inner pipe, one end of which is fixed and the other end of which is attached to a core elevator movable along the tube axis; A sample protection tube with a two-piece structure is provided so as to be located between the expandable sleeve and the inner tube.

The sample contained in the telescopic sleeve due to sampling is taken out from the inner tube together with the outer sample protection tube.

[Operation] During sampling, the sample enters the core tube while pushing up the core elevator, and is wrapped by the elastic sleeve. Therefore, the sample is housed in the two-part sample protection tube while being covered with the elastic sleeve.

Then, when taking out the sample, the telescopic sleeve containing the sample is not directly pulled out, but the entire outer sample protection tube is taken out from the inner tube.

This removal can be carried out smoothly by, for example, pushing out the sample protection tube from the inner tube using water pressure. If there is a margin between the inner tube and the sample protection tube, a hole or the like may be provided at the tip of the sample protection tube, and tools may be hooked into the hole and pulled out.

In any case, the sample is taken out while being surrounded by a telescopic sleeve and sample protection tube, and can be stored or transported in a shipping box as is, or it can be split into two, making it easy to observe the sample and select specimens for various tests. It can be done easily.

[Embodiment] FIG. 1 shows an embodiment of a quadruple-tube type core tube sampler according to the present invention, which is a device particularly suitable for sampling compact sandy soil or hard viscous soil. This sampler is composed of an outer tube 10, an inner tube 12, a sample protection tube 14, and an elastic sleeve 16 in order from the outside.

The outer tube 10 has a metal crown 18 attached to its distal end and a swivel head assembly 20 at its rear end.
A drill rond (not shown) is connected thereto. A cutting shoe 22 is provided at the tip of the inner tube 12,
The inner tube 1 has a so-called "tip protruding type" whose tip precedes the top face of the metal crown 18.
The rear end of 2 is connected to the swivel head assembly 20 and is configured not to rotate with respect to the outer tube 10. The telescopic sleeve 16 has one end (lower end) connected to the inner tube 12.
The other end (upper end) is attached to a core elevator 24 that can be raised along the tube axis. The telescopic sleeve 16 is made of a vinyl tube or the like, and is initially in a short, contracted state. As a sample is introduced during sampling, the core elevator 24 rises and the telescopic sleeve 16 is pulled out and extended.

A feature of the present invention is that a sample protection tube 14 having a two-piece structure is provided between the expanded position of the telescopic sleeve 16 and the inner tube 12.

The sample protection tube 14 is made of, for example, a vinyl chloride pipe.

Since the cutting shoes 22 have different lengths depending on the geology to be excavated, the length of the protrusion from the top face of the metal crown 18 can be adjusted.
The structure allows for fine adjustments using the lock nut at the top of the swivel head.

The sampling procedure is basically the same as in conventional core tube samplers of this type. The outer tube 10 is driven to rotate and the ground is excavated by the metal crown 18 at the tip. The swivel head assembly 20 allows the inner tube 12 to cut out the ground with the cutting shoe 22 at the tip without rotating with respect to the outer tube 10.The inner tube 14 has a protruding tip, so it can be used for circulation for excavation. It is possible to prevent the sample from being disturbed by muddy water. As shown in Figure 2,
During sampling, the sample 30 moves up within the core chamber while being wrapped in the telescopic sleeve 16. In this way, the sample 30 is housed within the telescopic sleeve 16.

To take out the sample 30 at the ground surface, after removing the metal crown 18 and cutting shoe 22 and separating the swivel head assembly 20, the telescopic sleeve I6 containing the sample 30, together with the outer sample protection tube 14, is hydraulically inserted into the inner tube. The sample protection tube 14, which can be pushed out smoothly from the sample 30
No force is applied to the elastic sleeve ■6 with
It can be easily removed from the sampler in the same state as it was collected.

By the way, when sampling loose sand layers, samples often fall off during the sampling process. To prevent this, spring
It has a structure that allows you to attach a core catcher. The core catcher is installed between the cutting shoe and the inner extension 26. The material of this core catcher needs to be carefully selected because if it is too elastic it will disturb the sample, but according to the test results it was able to fully fulfill its role as a stopper without disturbing the sample. Further, in this embodiment, the number of implanted chips is approximately three times the usual number in order to smooth cuffing by the metal crown 18 and minimize disturbance of the sample (improve sharpness).

Figure 3 shows the sample taken out from the sampler and sample protection tube 1.
4 is shown in an open state. When taken out from the sampler, the sample 30 is covered with a telescopic sleeve 16 and further surrounded on the outside by a sample protection tube 14 having a two-piece structure. Therefore, it can be easily stored in a transport box in this state and transported to a laboratory or the like. Furthermore, the sample protection tube 14
can be easily split into two, so by removing one,
Visual inspection etc. can also be performed as is.

Although a preferred embodiment of the present invention has been described in detail above, the present invention is not limited to such a tank bottom.

The present invention is also useful for collecting samples from heterogeneous strata such as compact gravel or crushed soft rock. The present invention is also useful for sampling large-diameter, undisturbed samples of shallow geological formations containing cultural properties and industrial waste. In fact, we created a sampler with an ultra-large diameter of 500 mm, and were able to collect samples from a heterogeneous surface, including cultural properties, without being disturbed.

[Effects of the Invention] As described above, the present invention has a structure in which the two-split sample protection tube is located outside the telescopic sleeve that envelops the sample, and the sample protection tube is taken out together, so that force is not applied to the sample or the telescopic sleeve. This makes it possible to easily take out the sample from the sampler in the same state as it was sampled. In the conventional telescopic sleeve type triple-tube sampler, disturbances often occur when taking out a sample, but according to the present invention, this can be almost 100% prevented.

In addition, the sample can be stored in a transport box at the excavation site and transported from the excavation site to the test chamber without touching the sample directly, so the sample will not be disturbed or deformed.

Particularly in the case of a large-diameter sampler, the sample is likely to be deformed because its own weight is large. Use of a sample protection tube such as the present invention that can prevent this is extremely effective.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the quadruple tube type core tube sampler according to the present invention, Fig. 2 is an explanatory diagram of its operation during excavation, and Fig. 3 is an explanatory diagram showing the state of the sample when it is collected. It is a diagram. DESCRIPTION OF SYMBOLS 10... Outer tube, 12... Inner tube, 14... Sample protection tube, 16... Telescopic sleeve, 18... Metal crown, 20... Swivel head assembly, 22...
... Cutting shoe 24 ... Core elevator, 30 ... Sample. Figure 1

Claims (1)

[Scope of Claims] 1. (a) an outer tube having a metal crown attached to its distal end and connected to a swivel head at its rear end; (b) a cutting shoe located inside the outer tube and disposed at its distal end; (c) an inner tube having one end fixed to the inner tube and connected to the swivel head at the rear end so as not to rotate with respect to the outer tube; (d) a telescoping sleeve attached to a core elevator movable along the tube axis; and (d) a two-split structure positioned between the telescoping sleeve and the inner tube when the telescoping sleeve is extended. A quadruple core tube sampler equipped with sample protection tubes and 2. A sample collection method using the sampler according to claim 1, in which a sample accommodated in a telescopic sleeve by sampling is taken out from the inner tube together with the outer sample protection tube.