JP3053588B2 - Geological survey sampler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates generally to geological survey samplers, and more particularly to viscosity, silt, sand,
Soft ground, such as gravel, peat, loam, volcanic ash, etc.
The present invention relates to a sampler for geological survey which can collect undisturbed geological samples for soft rock, rocky weathered zone, rocky weathered zone, and rock fractured part.

[0002]

As an instrument used for geological survey, there is known a geological sampler for sampling a geological sample, which is attached to the tip of a rod to collect the geological sample. Conventional geological survey samplers include thin wall samplers such as the Denison sampler,
There are core pack tubes for soft rock crush zones, samplers for hard rock crush zones, triple sand samplers, percussion sampling, and the like.

[0003] However, the thin wall sampler is capable of collecting undisturbed samples, but has the drawback that it can only be used for soft soil because the tube is very thin. In addition, since the core pack tube for the soft rock crush zone and the sampler for the hard rock crush zone need to feed water while rotating the rod when used, the collected sample will contain water, which is different from the water content of the original stratum There is a disadvantage that a sample having a water content is collected. Further, the triple sand sampler can collect undisturbed samples, but has a drawback in that the target stratum is limited. Furthermore, percussion sampling has the disadvantage that the equipment itself is very expensive and that the collected sample is disturbed because it is not wrapped in vinyl. in this way,
Conventional geological survey samplers have their advantages and disadvantages, and there are no satisfactory ones at present.

Accordingly, the present invention provides a sampler for a geological survey having a relatively simple structure capable of collecting an undisturbed sample having a water content substantially equal to that of an original formation over a wide range of strata. It is intended to provide.

[0005]

According to a first aspect of the present invention, there is provided a geological survey sampler comprising: an outer tube accommodating a collected sample; and a sampler tip screwed to a lower end of the outer tube via a reamer. The outer tip of the sampler has a hollow, almost tubular shape, the tip of the sampler is the tip end, a tubular inner shoe fitted to the upper end of the outer shoe, and a tubular inner extension fitted to the upper end of the inner shoe. The inner diameter of the tip of the sampler from the outer shoe to the inner extension tube through the inner shoe is gradually increased, and the tip of the outer shoe is positioned with respect to the longitudinal axis of the sampler for geological survey. The inner extension tube is at a predetermined angle, and the inner extension tube is And it is characterized in that it is Sera.

A geological survey sampler according to a second aspect of the present invention includes an outer tube for accommodating a collected sample, and a sampler tip screwed to a lower end of the outer tube via a reamer. The outer shoe has a hollow, substantially tubular shape, which is the leading end, and a reamer is screwed to the upper end of the outer shoe. The reamer has a gap between the inner surface of the reamer and the inner surface of the outer shoe. Is formed, the inner diameter of the tip of the sampler from the outer shoe to the reamer through the inner extension tube is gradually increased, and the tip of the outer shoe is At a predetermined angle to the longitudinal axis of the sampler for investigation, the inner extension tube has a cylindrical shape. The vinyl bag is covered in a bumped state, and the tip of the vinyl bag is folded back inside the inner extension tube beyond the tip of the inner extension tube, and is attached to the tip of the inner extension tube inside the outer shoe. A barrier is provided at an adjacent location to prevent earth and sand from entering the gap when the tip of the sampler is penetrated into the ground.

According to a third aspect of the present invention, there is provided the sampler for geological survey according to the first or second aspect, wherein the inner extension tube is made of stainless steel.

According to a fourth aspect of the present invention, in the sampler for geological survey according to the second aspect, a transparent acrylic tube having an outer diameter smaller than the inner diameter of the outer tube is fitted into the outer tube. It is characterized by the following.

The geological survey sampler according to claim 5 of the present application is the sampler according to any one of claims 1 to 4, wherein a length direction axis of the geological survey sampler is provided on a vinyl bag or an acrylic tube. A mark extending in a parallel direction is provided.

A geological survey sampler according to a sixth aspect of the present invention is the sampler according to any one of the first to fifth aspects, wherein a hitting device is attached to an upper end of the outer tube. Is what you do.

A geological survey sampler according to a seventh aspect of the present invention is the sampler according to the sixth aspect, wherein the hitting device is an air hammer, a monken, or a vibro hammer.

[0012]

Embodiments of the present invention will now be described with reference to the drawings. The geological survey sampler of the present invention, generally indicated by reference numeral 10 in FIG. Air hammer 12
Has a main body 14 and a hammer section 16 provided at a lower end of the main body 14, and the hammer section 16 is connected to a boring rod 50 from a compressor 56 installed on the ground, as described in detail later. As shown by arrow F, the air blows downward. The hammer section 16 is provided with an air escape hole 16a on the side surface, and a male threaded projection 16b at the lower end.

An outer tube 20 for accommodating the collected sample is connected to a lower end of the hammer section 16 of the air hammer 12 via a head 18. That is, the head 18
Is provided with a female threaded projection 18a at the upper end and a male threaded projection 18b at the lower end. The projection 16b of the hammer 16 and the projection 18a of the head 18 are The air hammer 12 and the outer tube 20 are connected by screwing the female screw 20a cut at the upper end of the outer tube 20 and the protruding portion 18b of the head 18.

A sediment tube 19 is screwed to the upper end of the head 18. The sediment tube 19 surrounds the hammer 16 when screwed to the upper end of the head 18. The sediment tube 19 surrounds the hammer portion 16 that moves up and down and directs the air coming out of the air escape hole 16a upward, thereby preventing the stratum beside the air escape hole 16a from collapsing and suppressing the collapse. Helps prevent accidents.

A sampler tip is screwed to the lower end of the outer tube 20 via a reamer 22. The tip of the sampler, depending on the magnitude of the N value of the target stratum,
It is divided into a sampler tip 24 for a high N value and a sampler tip 34 for a low N value.

FIG. 2 shows a sampler tip 24 for a high N value applied to a formation having a relatively large N value (N value of 6-8 or more). The sampler tip portion 24 has an outer shoe 26 that is the tip end. The outer shoe 26 has a hollow, substantially tubular shape, and the tip of the outer shoe 26 has a length equal to the length of the geological sampler 10 so that the sampler tip 24 can easily penetrate into the ground. A predetermined angle α is formed with respect to the direction axis L (see FIG. 1). The angle α is determined according to the type of the stratum.

A tubular inner shoe 28 is fitted on the upper end of the outer shoe 26, and a tubular inner extension tube 30 is fitted on the upper end of the inner shoe 28. The inner diameter of the sampler tip 24 from the outer shoe 26 to the inner extension tube 30 via the inner shoe 28 is gradually increased as shown in FIG. When the sampler tip 24 penetrates into the ground, the soil is compacted and the sampler tip 24 is less likely to penetrate into the ground (in other words, the sample is less likely to enter the sampler tip 24). By gradually increasing the inner diameter of the sampler tip 24 in a stepwise manner, the sampler tip 2
4 can easily penetrate into the ground.

A cylindrical transparent vinyl bag 32 is covered with the inner extension tube 30 in a state in which it is bumped, and the tip of the vinyl bag 32 extends into the reamer 22. In addition, the inner extension tube 30 is preferably so that the vinyl bag 32 is slippery.
Made of stainless steel.

FIG. 3 shows a sampler tip 34 for a low N value applied to a formation having a relatively small N value (N value of 6-8 or less). The sampler tip portion 34 has an outer shoe 36 which is a tip portion. The outer shoe 36, like the outer shoe 26, also has a hollow, substantially tubular shape, and the tip of the outer shoe 36 is formed so that the sampler tip 34 can easily penetrate into the ground. Has a predetermined angle α with respect to the longitudinal axis L (see FIG. 1). The angle α is determined according to the type of the stratum.

At the upper end of the outer shoe 36, a reamer 2
2 is screwed. A step 22a is formed substantially at the center of the reamer 22.
A tubular inner extension tube 40 is fitted so that a gap 38 is formed between the inner surface of the reamer 22 and the inner surface of the outer shoe 36. From the outer shoe 36 to the inner extension tube 4
The inner diameter of the sampler tip 34 that reaches the reamer 22 through 0 is the same as that of the sampler tip 24 for the high N value described above.
It is expanding step by step.

A cylindrical transparent vinyl bag 42 is covered with the inner extension tube 40 in a state of being crushed, and the tip 42a of the vinyl bag 42 extends beyond the tip 40a of the inner extension tube 40. It is folded inside the tube 40. Note that the inner extension tube 4
0 is also preferably made of stainless steel, like the inner extension tube 30.

A barrier 36a is provided on the inner surface of the outer shoe 36 at a position adjacent to the tip 40a of the inner extension tube 40 in order to prevent earth and sand from entering the gap 38 when the sampler tip 34 penetrates into the ground. Is provided.

A method of performing sampling by the sampler for geological survey 10 configured as described above will be described with reference to FIGS. 5 and 6. FIG. First, either the sampler tip 24 for the high N value or the sampler tip 34 for the low N value is selected according to the N value of the formation to be sampled (hereinafter, the sampler tip portion 34 for the low N value). Will be explained). Next, the outer tube 20 and the air hammer 12 are screwed to the selected sampler tip portion 34, and the boring rod 50 is screwed to the female screw portion 14a provided at the upper end of the main body 14 of the air hammer 12. Next, the boring rod 50 is supported by the spindle 52a of the boring machine 52 placed on the ground. Thereafter, the water swivel 5 attached to the upper end of the boring rod 50
The hose 4 is connected to the air discharge port of the compressor 56 by a hose 58.

Next, a downward force F is applied to the sampler tip 34 by supplying air from the compressor 56 to the air hammer 12 via the boring rod 50. Then, the sampler tip 34 is moved to the position shown in FIG.
As shown in (1), the earth and sand are pushed into the ground, and earth and sand enter the hollow portion of the outer shoe 36. Further, force F is applied,
When the earth and sand exceeds the upper end of the barrier 36a of the outer shoe 36, the tip 42a of the vinyl bag 42 is pulled by the earth and sand. Finally, the earth and sand (that is, the sample) wrapped in the vinyl bag 42 is stored in the outer tube 20. When a deep sample is to be collected, a long boring rod 50 is used. The length of the outer tube 20 and the length of the vinyl bag 42 are determined according to the length of the sample to be collected.

The present invention is not limited to the above embodiments of the invention, and various modifications can be made within the scope of the invention described in the claims, which are also within the scope of the present invention. It goes without saying that it is included in. For example, in the above embodiment, the sample is a plastic bag 42
Although it is only wrapped in, as shown in FIG.
Since a transparent acrylic tube 60 having an outer diameter smaller than the inner diameter of the outer tube 20 is accommodated in the outer tube 20, a sediment-like sample can be accommodated in the acrylic tube 60. be able to. In addition, the soft ground, the rock weathered portion, and the crushed portion can be stored as they are. The acrylic tube 60 is attached by fitting it into the step 22b at the upper end of the reamer 22.

Further, the lengthwise axis L of the sampler 10 for geological survey is attached to the vinyl bags 32, 42 or the acrylic tube 60.
By attaching a mark (not shown) extending in a direction parallel to the direction, the directionality of the collected sample in the formation can be known.

In the above embodiment, the sampler tips 24, 34 are penetrated into the ground by using the air hammer 12, but the boring rod is not used by the boring machine without using the air hammer 12. By rotating the sampler tips 24 and 34, the sampler 10 may be penetrated into the ground.

Further, in the above embodiment, an air hammer is used as a hitting device, but another hitting device such as a monken or a vibro hammer may be used.

[0029]

According to the present invention, since water is not used at the time of sampling, a sample having a water content that is not different from the water content of the original formation can be obtained. In addition, since the sample to be collected is wrapped in a vinyl bag and the inside diameter of the tip of the sampler is gradually increased to reduce consolidation, an undisturbed sample can be obtained. Since the sample to be collected is wrapped in a plastic bag, if you save the sample without cutting the plastic bag,
The sample remains substantially unchanged from the time of sampling even at the time of inspection. In addition, by marking a vinyl bag or the like, it is possible to know the directionality of the collected sample in the formation. In addition, by using a transparent acrylic tube, even a soil-like sample can be viewed as a columnar core, and the soft ground, the weathered rock portion, and the crushed portion can be stored as they are.

[Brief description of the drawings]

FIG. 1 is a partially cut-away sectional view showing a sampler for geological survey of the present invention.

FIG. 2 is a sectional view showing a sampler tip for a high N value.

FIG. 3 is a sectional view showing a sampler tip for a low N value.

FIG. 4 is a partially cut-away sectional view showing another embodiment of a low-N value geological survey sampler.

FIG. 5 is a schematic diagram showing a state where sampling is performed using the geological survey sampler of the present invention.

FIG. 6 is a partially cut-away cross-sectional view showing a sampler tip for a low N value at the time of sampling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Geological survey sampler 12 Air hammer 18 Head 19 Sediment tube 20 Outer tube 22 Reamer 24 Sampler tip for high N value 26 Outer shoe 28 Inner shoe 30 Inner extension tube 32 Vinyl bag 34 Sampler tip for low N value 36 Outer shoe 38 Clearance 40 Inner extension tube 42 Vinyl bag

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 1/04 E21B 25/00-25/18

Claims (7)

(57) [Claims] 1. A sampler for geological investigation, comprising: an outer tube for accommodating a collected sample; and a sampler tip screwed to a lower end of the outer tube via a reamer. The outer shoe has a hollow, substantially tubular shape, a tubular inner shoe fitted to the upper end of the outer shoe, and a tubular inner extension tube fitted to the upper end of the inner shoe. The inner diameter of the tip of the sampler that reaches the inner extension tube via the inner shoe is gradually increasing, and the tip of the outer shoe is at a predetermined angle with respect to the longitudinal axis of the sampler for geological survey. The tube is covered with a cylindrical vinyl bag in a bumped state. sampler. 2. A sampler for geological investigation, comprising: an outer tube for accommodating a collected sample; and a sampler tip screwed to a lower end of the outer tube via a reamer. The outer shoe has a hollow, substantially tubular shape, and a reamer is screwed to the upper end of the outer shoe.A gap is formed between the inner surface of the reamer and the inner surface of the outer shoe. As such, the tubular inner extension tube is fitted, the inner diameter of the sampler tip from the outer shoe to the reamer via the inner extension tube is gradually increased, and the tip of the outer shoe is
The geological survey sampler is at a predetermined angle with respect to the longitudinal axis, and the inner extension tube is covered with a cylindrical vinyl bag in a lapped state, and the tip of the inner bag is the inner extension. Beyond the tip of the tube, it is folded back inside the inner extension tube, and at the location adjacent to the tip of the inner extension tube on the inner surface of the outer shoe, when the tip of the sampler penetrates into the ground, the earth and sand fill the gap. A sampler characterized by a barrier provided to prevent entry. 3. The inner extension tube according to claim 1,
3. The sampler according to claim 1, wherein the sampler is made of stainless steel. 4. The sampler according to claim 2, wherein a transparent acrylic tube having an outer diameter smaller than the inner diameter of the outer tube is fitted into the outer tube. 5. The method according to claim 1, wherein a mark extending in a direction parallel to a longitudinal axis of the sampler for geological survey is attached to the vinyl bag or the acrylic tube. The sampler described. 6. The sampler according to claim 1, wherein a hitting device is attached to an upper end of the outer tube. 7. The hitting device is an air hammer, a monken,
Or a vibro hammer.
The sampler described in 1.