JP3436671B2 - Soil sampler - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-in type or impact-penetration type soil sampler. More specifically, a rolled synthetic resin sheet is inserted into a sampling tube, and a soil sample is placed in the synthetic resin sheet. The present invention relates to a soil sampler capable of easily and quickly taking out a sample at the present position by accommodating it. The soil sampler is not particularly limited, but is suitable for collecting a soil sample containing a volatile substance in a relatively soft and shallow formation such as an industrial waste disposal site.

[0002]

2. Description of the Related Art As a sampler for collecting soil samples,
Various types of devices have been researched, developed, and used. Typical examples include a thin-wall (thin-walled pipe) type sampler, a core pack sampler wrapping a core with a stocking tube, and a double-tube sampler having a double-tube structure for the sampling tube. They are,
It is appropriately selected and used according to the soil properties of the soil sample to be collected, the depth, the purpose of sampling, and the like.

These are generally large-scale devices, and in any case, it is necessary to use a boring hole. In order to perform sampling, it is necessary to apply a large penetration force, rotational force or excavation force. It is not possible to easily take out or observe samples on-site. A sample pushing device is required to take out the collected sample. There were restrictions such as.

As a device having less such restrictions, there is a split type sampler for a standard penetration test. This has a structure in which the sampling tube for storing the sample is divided into two parts, and it is possible to take out the sample at the site by depressing or hammering into the ground to sample the soil and disassembling the pulled up sampler.

[0005]

By the way, in recent years, there has been an increasing demand for environmental surveys at or around the industrial waste treatment plant. Soil surveys are conducted as a part of such environmental surveys, but chemicals and other substances may penetrate underground and may contain volatile substances, so soil can be sampled easily and quickly at the site, and sampling It is important to be able to quickly take out the soil and make various measurements. The ground for such soil investigation is relatively soft and often has a fairly shallow depth (for example, about a dozen meters or less).

However, a soil sampler suitable for such use has not yet been developed. In the above-mentioned split type sampler, it takes a long time to decompose, and it is very difficult to take out a sample quickly before the volatile component in the soil is changed.

The object of the present invention is to collect soil samples easily, and to take out the soil samples quickly collected at the soil sampling site from the sampling tube, and to perform various necessary operations before the state and components of the samples are changed. The purpose is to provide a soil sampler that can be measured.

[0008]

According to the present invention, there is provided a sampling tube for forming a space for accommodating a soil sample therein, a connector head for connecting a penetrating rod fixed to a base end portion of the sampling tube, and A detachable cutting shoe at the tip of the sampling tube,
It is premised on a soil sampler equipped with a core catcher mounted inside the tip of the sampling tube. Here, a synthetic resin sheet is rolled up and inserted into the inside of the sampling tube, and the synthetic resin sheet is attached so as to be adhered over substantially the entire inner circumference of the sampling tube. Wrap it in a sheet and synthesize it after collecting the soil
By pulling out the resin sheet from the sampling tube
The soil sample is also wrapped in a synthetic resin sheet and pulled out together.
It is configured so that there is a feature in that point.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION It is desirable that the cutting shoe be attachable to and detachable from the tip of the sampling tube by a screwing method. For example, a transparent sheet made of polyvinyl chloride is used as the synthetic resin sheet. The width of the seat is almost the same as the inner circumference of the sampling tube, the length of the seat is slightly longer than the length of the sampling tube, and the part longer than the length of the sampling tube is folded back to the outside and the bent part and the outer circumference of the core catcher. Part and
The sampling tube and cutting shoe are sandwiched and fixed. The synthetic resin sheet has a thickness of 0.
The thickness is preferably about 1 to 0.2 mm, and a durable material having such a thickness is used.

[0010]

EXAMPLE FIG. 1 is an explanatory view showing an example of a soil sampler according to the present invention in a half sectional state, and FIG.
An X sectional view and FIG. 3 are detailed views of the mounting. A soil sampler 10 according to the present invention includes a sampling tube 12 which forms a space for accommodating a soil sample therein, a connector head 14 for connecting a penetrating rod fixed to a proximal end portion of the sampling tube 12, and The sampling tube 16 is provided with a cutting shoe 16 which is detachable from the tip of the sampling tube 12 and a core catcher 18 which is mounted inside the tip of the sampling tube 12.

The connector head 14 has an air vent hole 20.
Are formed, and the connector head 14 and the sampling tube 12 are fixed by the set screws 22 at three positions after fitting. The cutting shoe 16 is attached to the sampling tube 12 by a screwing method. The sampling tube 12 is made of a thin metal pipe, and has a length of, for example, about 1 m, although it depends on the sampling conditions and the amount of soil sample. Cutting shoe 1
No. 6 has an inner diameter of about 28 mm and an outer diameter of about 38 mm, for example, and the tip has a sharp cutting edge. Core catcher 18
Here, what is called a spring type core catcher is used, and a metal thin plate having high elasticity is attached in a state of being curved from the tip of the cutting shoe 16 toward the sampling tube 12. Of course, a rigid core catcher in which a plurality of rigid plates are divided along the circumference and horizontally fixed by a hinge may be used. Here, the sampler 10 has a small diameter and a thin wall structure to reduce the pushing force at the time of soil sampling.

In the present invention, the synthetic resin sheet 30 is rolled into the inside of the sampling tube 12, and the synthetic resin sheet 30 is attached so as to come into close contact with substantially the entire inner circumference of the sampling tube 12 (see FIG. 2)), the soil sample is wrapped with the rolled synthetic resin sheet 30 at the time of soil collection. The material of the synthetic resin sheet 30 is not particularly limited, but a thin and durable material is used. If it is transparent, the state of the collected soil sample can be visually observed as it is, which is preferable.

In this embodiment, a transparent polyvinyl chloride sheet having a thickness of about 0.12 mm is used as the synthetic resin sheet 30. The width of the synthetic resin sheet 30 is the same as the inner circumferential length of the sampling tube 12, the length thereof is slightly longer than the length of the sampling tube 12, and the portion longer than the sampling tube length is folded back to the outside ( (Shown by reference numeral 30a), the bent portion 30b and the outer peripheral portion 18a of the core catcher 18 are sandwiched between the tip 12a of the sampling tube 12 and the inner peripheral stepped portion 16a of the cutting shoe 16 to form the cutting shoe 16
It is fixed by screwing in (see Fig. 3).

The procedure for collecting soil samples is as follows. First, a synthetic resin sheet 30 having a predetermined size is prepared, one end thereof is folded back, and the folded portion is rolled so that the folded portion is on the outer side and inserted from the front end side of the sampling tube 12. Since the synthetic resin sheet 30 tries to expand outward due to its elasticity, it easily adheres to the inner wall of the sampling tube 12. Since such a thin synthetic resin sheet 30 is simply rolled and inserted into the sampling tube 12, it can be set very easily. In the closely contacted state, the synthetic resin sheet 30 is in a state where the edges are abutted with each other (the abutted portion is indicated by reference numeral 30c), as shown in FIG.
As shown in FIG. 3B, the folded-back portion 30a of the synthetic resin sheet 30 extends from the tip of the sampling tube 12 to the outer peripheral surface side thereof. Next, insert the core catcher 18 and attach the cutting shoe 16 to the sampling tube 1
The synthetic resin sheet 30 and the core catcher 18 are held by the sampling tube 12 and the cutting shoe 16 by being screwed into the tip end of the second synthetic resin sheet 30. This completes the assembly of the soil sampler.

Soil sampler 10 assembled in this way
A penetrating rod (not shown) is connected to the connector head 14 of FIG. Then, it is inserted into the soil sampling point, and the penetrating rod is pushed into the ground by exerting a pushing force by water pressure or a hydraulic device on the penetrating rod, or imparting a striking force by a hammer or a weight drop. Soil is cutting shoe 1
It is cut off at 6 and pushed into the sampling tube 12. At that time, the core catcher 18 is deformed so as to be in close contact with the synthetic resin sheet 30, so that the accommodation of the soil sample is not hindered. When the penetration rod is pulled up after being pushed in, the soil sampler 10 rises and the collected soil is about to be left behind.
The soil spreads and the soil sample is prevented from falling off.

The soil sampler 10 that has been pulled up can be used for visual inspection of soil samples collected by dismantling and for various inspections.
The measurement can be performed immediately. First, the cutting shoe 16 is rotated to remove it from the sampling tube 12, and the core catcher 18 is removed. Next, the folded-back portion 30a of the synthetic resin sheet 30 is returned to its original state, and the folded-back portion 30a is gripped to collect the sampling tube 1
Pull out from 2 in the direction of the arrow (see A in FIG. 4). Then, the soil sample 40 is pulled out together with the synthetic resin sheet 30 while being wrapped in the synthetic resin sheet 30. Transparent synthetic resin sheet 3
Since 0 is used, the soil sample can be visually observed in that state. Further, if it is completely pulled out from the sampling tube 12, the synthetic resin sheet 30 can be easily opened from the abutting portion 30c, and the soil sample 40 can be taken out as it is (see B in FIG. 4).

Since the surface of the synthetic resin sheet 30 is smoother than the inner surface of the sampling tube 12, the resistance at the time of sampling the soil is small. In addition, after the soil sampling, rather than the friction resistance between the soil sample 40 and the sampling tube 12,
Since the friction resistance between the synthetic resin sheet 30 and the sampling tube 12 is smaller and the soil sample 40 is wrapped in the synthetic resin sheet 30 and pulled out, the soil sample 40 is hardly disturbed when pulled out. Furthermore, since the soil sampler as a whole has a small diameter and a thin wall structure, and the friction between the soil sample 40 and the synthetic resin sheet 30 is small as described above, the resistance at the time of sampling the soil is small and the pushing force of the soil sampler is small. can do. Although it depends on the properties of the ground, the soil sampler having the dimensions of the above-mentioned example weighs 3
I was able to hit it with a 0 kg hammer. Incidentally, the conventional split-type sampler for the standard penetration test requires a hammer having a weight of 63.5 kg. The difference in the weight of the hammer has a great influence on the weight and size of the driving device, and the soil sampler of the present invention has a device weight of 130 kg.
Since a small-sized penetration testing device can be used, it has good mobility and the efficiency of soil survey is significantly improved.

[0018]

As described above, according to the present invention, the synthetic resin sheet is rolled into the inside of the sampling tube and inserted, the soil sample is wrapped with the rolled synthetic resin sheet at the time of sampling, and the soil sample is synthesized after sampling. Since it is pulled out together with the resin sheet, the soil sample collected is disturbed or compressed to some extent, but it can be observed as it is and the accumulation condition can be sufficiently discriminated. Further, since the soil components can be measured easily and quickly, a very accurate component measurement can be carried out especially when collecting a soil sample containing a volatile substance. Further, since the soil sampler according to the present invention can have a small-diameter and thin-walled structure, the pushing force can be small, and the entire system can be made compact and lightweight. Therefore, it has excellent mobility and enables efficient sampling, observation and measurement of soil samples.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a soil sampler according to the present invention in a half-section state.

FIG. 2 is a cross-sectional view at the XX position.

FIG. 3 is an explanatory view showing a mounting structure of the synthetic resin sheet and the core catcher.

FIG. 4 is an explanatory view showing a situation of taking out a soil sample.

[Explanation of symbols]

10 Soil sampler 12 sampling tubes 14 Connector head 16 cutting shoes 18 core catcher 30 synthetic resin sheet 40 soil samples

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-161129 (JP, A) JP-A-3-295922 (JP, A) JP-A-9-250128 (JP, A) JP-A-8- 74489 (JP, A) JP-A-3-81492 (JP, A) JP-A-2-232412 (JP, A) JP-B 8-16431 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01N 1/00-1/44 E02D 1/00-1/08 E21B 25/00-25/18 JISC file (JOIS)

Claims (2)

(57) [Claims] 1. A sampling tube for forming a space for containing a soil sample therein, a connector head for connecting a penetrating rod fixed to a proximal end portion of the sampling tube, and a detachable end portion of the sampling tube. In a soil sampler equipped with a cutting shoe and a core catcher attached to the inside of the tip of the sampling tube, a synthetic resin sheet is rolled into the inside of the sampling tube, and the synthetic resin sheet is It is attached so that it adheres to almost the entire inner circumference, and when collecting soil, wrap the soil sample with the rounded synthetic resin sheet, and after collecting the soil, remove the synthetic resin sheet.
Soil samples can also be combined by pulling out from the sampling tube.
A soil sampler characterized by being wrapped in a synthetic resin sheet and pulled out together . 2. The cutting shoe is attachable to and detachable from the tip of the sampling tube by screwing.
The synthetic resin sheet is a transparent sheet made of polyvinyl chloride, and the width of the synthetic resin sheet is almost the same as the inner circumference of the sampling tube, and the length is about the same as or longer than the sampling tube length, and a part of the outer side is outside. 2. The soil sampler according to claim 1, wherein the soil sampler is folded back into the soil, and the bent portion and the outer peripheral portion of the core catcher are sandwiched and fixed by a sampling tube and a cutting shoe.