JP3669495B2 - Geological survey sampler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to geological survey samplers. More specifically, the present invention relates to a geological survey sampler that can collect undisturbed geological samples.
[0002]
[Prior art]
As a tool used for geological survey, a sampler for geological survey, which is attached to the tip of a rod and collects a geological sample when sampling a geological sample, is known. Examples of conventional geological survey samplers include thin wall samplers such as Denison samplers, core pack tubes for soft rock fracture zones, samplers for hard rock fracture zones, triple sand samplers, and percussion sampling.
[0003]
[Problems to be solved by the invention]
However, sampling with a conventional geological survey sampler is basically intended to collect a sample by driving a tube into the ground, and because it is disturbed by applying force to the soil around the tube wall during sampling, It was difficult to collect undisturbed samples. Moreover, it has not been easy to collect a sample at a desired depth with a conventional geological survey sampler. Furthermore, since the length of a conventional geological survey sampler is about 1 to 1.5 m at most, there is a limit to the length at which a sample can be collected.
[0004]
Accordingly, an object of the present invention is to provide a geological survey sampler capable of collecting an undisturbed sample. Another object of the present invention is to provide a geological survey sampler capable of collecting a sample at a desired depth. Yet another object of the present invention is to provide a geological survey sampler capable of collecting a sample longer than the conventional one.
[0005]
[Means for Solving the Problems]
Geological Survey Sampler according to the claims 1 comprises a first body to be driven into the ground, and a second body to be driven into the ground after typing the first body in the ground, the 1 main body and / or 2nd main body is formed with the member which divided the circular steel pipe, or the member which has a U-shaped cross section, and the longitudinal direction edge of the 1st main body and the 2nd main body When these main bodies are combined, a guiding means for guiding each other is provided, and on the outer surface on the opposite side of the second main body where the first main body is located , in the horizontal direction. It is characterized by being provided with a protrusion that extends and has a triangular side view.
[0006]
The sampler for geological survey according to claim 2 of the present application is a trapezoidal plate having a thickness t, wherein the guide means is arranged at the lower end of the longitudinal edge of the first body in the sampler of claim 1. A first guide plate having a thickness t and a trapezoidal plate-like second guide disposed at a predetermined distance downward from the upper end of the first main body and at a distance t from the outer surface of the first main body. A plate, a third guide plate of thickness t disposed along the lengthwise edge of the second body, and a thickness of t disposed on top of the lengthwise edge of the second body. A trapezoidal plate-like fourth guide plate, and when the third guide plate combines the first main body and the second main body, the lower part is cut off so as to complement the first guide plate. And when the fourth guide plate combines the first main body and the second main body, the second guide play And it is characterized in that it is shaped to complement the.
[0007]
The sampler for geological survey according to claim 3 of the present application is the sampler according to claim 1 or 2, wherein the main body is driven into the center of the upper end inner surface of the first and second main bodies or pulled out from the ground. The operation member used when carrying out is attached.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, a sampler for geological survey according to a preferred embodiment of the present invention will be described with reference to the drawings. A geological survey sampler according to a preferred embodiment of the present invention, generally indicated by reference numeral 10 in FIGS. 1 and 5, includes a first main body 20 and a second main body 30. The 1st and 2nd main bodies 20 and 30 are formed with metal materials, such as steel.
[0009]
As shown in FIG. 2, the first main body 20 is formed of a member obtained by halving a circular steel pipe. A trapezoidal plate-shaped first guide plate 22 having a thickness t is disposed at the lower ends of both longitudinal edges 20a and 20b of the first main body 20, and the first guide plate 22 The acute angle portion 22 a is firmly fixed to the first main body 20 so as to be positioned outward and upward of the first main body 20.
[0010]
A trapezoidal plate-like second guide plate 24 is disposed above the lengthwise edges 20 a and 20 b of the first main body 20, and the second guide plate 24 is configured by the first main body 20. At a location spaced a predetermined distance downward from the upper end of the first body 20 so that the acute angle portion 24a is positioned outward and upward of the first body 20 and at a distance t from the outer surface of the first body 20. (See FIG. 2A), which is firmly fixed to the first main body 20. In the example shown in FIG. 2A, the spacer 26 is used to position the second guide plate 24 at a position separated from the outer surface of the first main body 20 by a distance t.
[0011]
An operation member 28 that is used when the first main body 20 is driven into the ground or pulled out from the ground is attached to substantially the center of the upper end inner surface of the first main body 20. As the operation member 28, a pipe, a rod, or the like is used.
[0012]
Similarly to the first main body 20, the second main body 30 is also formed of a member in which a circular steel pipe is halved. A third guide plate 32 having a thickness t is disposed on both longitudinal edges 30a and 30b of the second main body 30, and the third guide plate 32 is as shown in FIG. When the first main body 20 and the second main body are combined, the lower portion is cut away so as to complement the first guide plate 22. When the third guide plate 32 tries to drive the second main body 30 into the ground, the lengthwise edges 30a and 30b of the second main body 30 are replaced with the lengthwise edges of the first main body 20. Helps guide the second body 30 to match 20a, 20b.
[0013]
A trapezoidal plate-like fourth guide plate 34 having a thickness t is disposed on the upper portions of both longitudinal edges 30a and 30b of the second main body 30, and the fourth guide plate 34 is shown in FIG. As shown in FIG. 5, when the first main body 20 and the second main body are combined, the acute angle portion 34a is formed on the outer side of the second main body 30 so as to complement the second guide plate 22. It is firmly fixed to the third guide plate 32 so as to be positioned downward.
[0014]
On the outer surface of the lower portion of the second main body 30, a protrusion 36 is attached that extends in the horizontal direction and has a triangular shape in a side view. More specifically, as shown in FIG. 6A, the protrusion 36 includes a ridge line 36a that forms a vertex of the triangle, a first surface 36b that forms the upper side of the triangle across the ridge line 36a, It has the 2nd surface 36c which forms the lower side of a triangle on both sides of ridge line 36a, and the 3rd surface 36d which forms the base of a triangle, and the 3rd surface 36d is the lower part of the 2nd main part 30. It is firmly fixed to the outer surface. The horizontal length of the protrusion 36 is represented by the central angle α of the second main body 20 as shown in FIG. According to experiments conducted by the present inventor, α is preferably 45 ° or more.
[0015]
The protrusion 36 functions as follows. That is, when the second main body 30 is to be driven into the ground, as shown in FIG. 6C, a force as indicated by an arrow acts on the second surface 36c of the protrusion 36. Then, the second main body 30 tries to move to the right (the direction in which the first main body 20 is located) in FIG. 6C, and helps the uniting with the first main body 20. On the other hand, when pulling out the geological survey sampler 10 from the ground, as shown in FIG. 6 (d), a force as indicated by an arrow acts on the first surface 36b of the projection 36, The second main body 30 is pulled out in a state in which a force is applied to the right in FIG. At the same time, when the second main body 30 is driven in, the soil A located on the protrusions 36 is at least partially excluded, so that it is possible to expect a reduction in the resistance of the soil to the drawing.
[0016]
An operation member 38 that is used when the second main body 30 is driven into the ground or pulled out from the ground is attached to substantially the center of the upper end inner surface of the second main body 30. As the operation member 38, a pipe, a rod, or the like is used similarly to the operation member 28.
[0017]
The guide plates 22, 24, 32, 34, the spacer 26, the protrusion 36, and the operation members 28, 36 are attached to the main bodies 20, 30 by welding.
[0018]
The use of the geological survey sampler 10 configured as described above will be described. First, the first main body 20 is driven into the ground to be sampled using a hammer or the like (not shown) (FIGS. 7A and 7B). Next, the second main body 30 is driven into the ground with a hammer or the like so that the lengthwise edges 30a and 30b face the lengthwise edges 20a and 20b of the first main body 20 (FIG. 7C). (D)). At this time, the second main body 30 is guided and driven by the guide plates 22, 24, 32, and 34 without being separated from the first main body 20 due to the force acting on the protrusion 36. On the other hand, when the sampler is to be pulled out, it is pulled out by attaching a pulling machine (not shown) to the operation members 28, 38. However, due to the force acting on the protrusion 36, the first and second main bodies 20, 30 is pulled out while being integrated (FIG. 7F). As described above, since the soil located on the protrusion 36 is at least partially removed, the drawing operation is facilitated.
[0019]
The example shown in FIG. 7 is a case where the soil near the ground surface is to be sampled. As shown in FIG. 8, after excavating a borehole beforehand, the sampler for geological survey of the present invention is used. The soil of desired depth can be sampled.
[0020]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say, it is something.
[0021]
For example, in the above-described embodiment, the first and second main bodies 20 and 30 are formed by halving a circular steel pipe. As shown in FIG. 9, the first main body 20 and the second main body 20 and the second main body 20 and 30 are used. A member having a U-shaped cross section may be used for either or both of the main bodies 30 of the present invention.
[0022]
【The invention's effect】
In the sampler 10 for geological survey of the present invention, since the two main bodies 20 and 30 are separately embedded in the ground, the force applied to the soil around the tube wall is greatly reduced as compared with the conventional sampler, and the undisturbed sample. Can be collected. In addition, by using the sampler 10 for geological survey of the present invention after excavating a borehole in advance, it becomes possible to collect a sample at a desired depth. Furthermore, according to the configuration of the sampler 10 for geological survey of the present invention, the length of the sampler (and therefore the main body) can be made longer than that of the conventional sampler, and thus a long sample can be collected. It was.
[Brief description of the drawings]
FIG. 1 is a front view showing a sampler for geological survey according to a preferred embodiment of the present invention.
2A is a plan view seen from a line 2a-2a in FIG. 1, and FIG. 2B is a cross-sectional view seen from a line 2b-2b in FIG. 1;
3A is a side view seen from a line 3a-3a in FIG. 1, and FIG. 3B is a side view seen from a line 3b-3b in FIG.
4A is a side view seen from line 4a-4a in FIG. 1, and FIG. 4B is a side view seen from line 4b-4b in FIG.
5 is a front view showing a state in which a first main body and a second main body of the geological survey sampler of FIG. 1 are united. FIG.
6A is a cross-sectional view taken along line 6a-6a in FIG. 3A, FIG. 6B is a cross-sectional view taken along line 6b-6b in FIG. 3A, and FIG. The figure which showed the state of the projection part vicinity when trying to drive the 2nd main body into the ground, (d) showed the state of the projection part vicinity when trying to pull out the 2nd main body from the ground FIG.
7 is a diagram showing a series of procedures when sampling is performed using the geological survey sampler of FIG. 1; FIG.
FIG. 8 is a diagram showing a state of sampling after drilling a boring hole.
FIG. 9 is a view showing a modification of the first main body and the second main body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Geological survey sampler 20 1st main body 22 1st guide plate 24 2nd guide plate 28 Operation member 30 2nd main body 32 3rd guide plate 34 4th guide plate 36 Projection part 38 Operation member

Claims (3)

A geological survey sampler,
A first body driven into the ground ;
A second body driven into the ground after the first body is driven into the ground ;
The first main body and / or the second main body is formed of a member in which a circular steel pipe is halved or a member having a U-shaped cross section;
Guiding means for guiding each other when these main bodies are combined is provided at the longitudinal edges of the first main body and the second main body,
A sampler, characterized in that a projecting portion extending in a horizontal direction and having a triangular shape in a side view is provided on an outer surface of the lower portion of the second body opposite to the side on which the first body is located .   The guide means is disposed at the lower end of the longitudinal edge of the first main body, and has a trapezoidal plate-shaped first guide plate having a thickness t, and is spaced a predetermined distance downward from the upper end of the first main body. A trapezoidal plate-like second guide plate having a thickness t disposed at a distance t from the outer surface of the first body, and a thickness disposed along a longitudinal edge of the second body. a third guide plate of t, and a trapezoidal plate-shaped fourth guide plate having a thickness t disposed on the upper part of the longitudinal edge of the second body, the third guide plate comprising: When the first main body and the second main body are combined, the lower part is cut off so as to complement the first guide plate, and the fourth guide plate combines the first main body and the second main body. 2. The sampler of claim 1, wherein the sampler is shaped to be complementary to the second guide plate when moved.   The operation member used when driving these main bodies into the ground or pulling them out from the ground is attached to the center of the upper end inner surface of the 1st and 2nd main bodies. The sampler described in 1.

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