JPH11132917A - Soil sampler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect a soil sample simply, take out the soil sample quickly from a sampling tube, and carry out necessary measurements before a state and components do not change. SOLUTION: The sampler has a sampling tube 12 forming a space for storing a soil sample thereinside, a connector head 14 fixed at a base end part of the sampling tube for connecting an insertion rod, a detachable cutting chute 16 at a leading end part of the sampling tube 12, and a core catcher 18 fitted inside the leading end part of the sampling tube 12. A synthetic resin sheet 30 of a roll is inserted in the sampling tube 12 to be tightly adhered to nearly the whole of an inner circumference of the sampling tube 12. At a collection time, the soil sample is wrapped with the rolled synthetic resin sheet 30, and taken out together when the synthetic resin sheet 30 is taken outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil sampler of a push-in type or a hit-penetration type. 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 that can easily and quickly take out a sample at a current position by housing. Although this soil sampler is not particularly limited, it is suitable for collecting a soil sample containing a volatile substance in a relatively soft and shallow stratum 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 pipe) type sampler, a core pack sampler that wraps a core using a stocking tube, and a double tube sampler having a sampling tube with an inner / outer double tube structure. They are,
It is appropriately selected and used depending on the properties of the ground, the depth, the purpose of collection, etc. of the soil sample to be collected.

[0003] 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, a rotational force, or a digging force. It is not easy to take out and observe samples on site. A sample pusher is required to take out the collected sample. There were restrictions such as.

[0004] As a device having few such restrictions, there is a split type sampler for a standard penetration test. In this method, a sampling tube for accommodating a sample is divided into two parts. The sample can be taken out at the site by pushing or driving the sample into the ground, sampling the soil, and disassembling the sampler pulled up.

[0005]

In recent years, there has been an increasing demand for environmental investigations at or near industrial waste disposal sites. Soil surveys are conducted as part of such environmental surveys.Since chemicals etc. may have penetrated underground and may contain volatile substances, soil can be sampled easily and quickly on site, and sampling can be performed. It is important to take out the soil immediately and perform various measurements. The ground on which such soil surveys are performed is relatively soft and often has a relatively shallow depth (for example, about 10 m or less).

However, a soil sampler suitable for such a use has not yet been developed. With the above-mentioned split sampler, it takes a long time to decompose, and it is very difficult to perform a quick operation such as taking out a sample before changing the components of the volatile substances in the soil.

SUMMARY OF THE INVENTION It is an object of the present invention to easily collect a soil sample, and to take out a soil sample quickly collected at a soil sampling site from a sampling tube and to perform various necessary operations before the state and components of the sample change. An object of the present invention is to provide a soil sampler capable of performing measurement.

[0008]

According to the present invention, there is provided a sampling tube forming a space for accommodating a soil sample therein, a connector head for connecting a penetrating rod fixed to a base end of the sampling tube, and A detachable cutting shoe at the tip of the sampling tube,
It is assumed that the soil sampler has a core catcher mounted inside the tip of the sampling tube. Here, a synthetic resin sheet is rolled and inserted into the inside of the sampling tube, and the synthetic resin sheet is attached so as to be in close contact with almost the entire inner periphery of the sampling tube. It is configured to be wrapped in a sheet, which is characteristic.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The cutting shoe is desirably detachable by a screw-in method with respect to the tip of the sampling tube. For example, a transparent sheet made of polyvinyl chloride is used as the synthetic resin sheet. The width of the sheet is almost the same as the inner circumference of the sampling tube, the length of the sheet is slightly longer than the length of the sampling tube, and the portion longer than the length of the sampling tube is turned outward. Department and
The sampling tube and the 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 material having a thickness of about that and a durable material is used.

[0010]

FIG. 1 is an explanatory view in a half sectional state showing an embodiment of a soil sampler according to the present invention, and FIG.
FIG. 3 is an X sectional view, and FIG. The soil sampler 10 according to the present invention includes a sampling tube 12 forming a space for accommodating a soil sample therein, a connector head 14 for connecting a penetration rod fixed to a base end of the sampling tube 12, and The cutting tube 16 includes a cutting shoe 16 that is detachable from the distal end of the sampling tube 12 and a core catcher 18 that is mounted inside the distal end 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 at three places by set screws 22 after fitting. The cutting shoe 16 is attached to the sampling tube 12 by a screwing method. The sampling tube 12 is formed of a thin metal pipe, and has a length of, for example, about 1 m, depending on the conditions of sampling and the amount of the soil sample. Cutting shoe 1
Numeral 6 has an inner diameter of about 28 mm and an outer diameter of about 38 mm, for example, and has a sharp edge at the tip. Core catcher 18
Here, a so-called spring-type core catcher is used, in which a thin metal plate having high elasticity is mounted in a state of being bent from the tip of the cutting shoe 16 toward the sampling tube 12. Of course, a rigid core catcher or the like in which the rigid plate is divided into a plurality of pieces along the circumference and fixed horizontally by hinges may be used. Here, the sampler 10 has a small diameter and a thin structure to reduce the pushing force at the time of collecting soil.

In the present invention, the synthetic resin sheet 30 is rolled and inserted into the inside of the sampling tube 12, and the synthetic resin sheet 30 is mounted so as to be in close contact with almost the entire inner periphery of the sampling tube 12 (FIG. 2), the soil sample is wrapped in the rounded 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. Transparency is preferable because the state of the collected soil sample can be visually observed as it is.

In this embodiment, a transparent sheet made of polyvinyl chloride and 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 is slightly longer than the length of the sampling tube 12, and a portion longer than the sampling tube length is folded outward (the folded portion is not folded). The bent portion 30b and the outer peripheral portion 18a of the core catcher 18 are sandwiched between the distal end 12a of the sampling tube 12 and the inner peripheral step portion 16a of the cutting shoe 16, so that the cutting shoe 16 is formed.
(See FIG. 3).

The procedure for collecting a soil sample is as follows. First, a synthetic resin sheet 30 having a predetermined size is prepared, one end is folded, the folded portion is rounded out, and inserted from the tip end side of the sampling tube 12. Since the synthetic resin sheet 30 tends to expand outward due to its elasticity, it easily adheres to the inner wall of the sampling tube 12. Since the thin synthetic resin sheet 30 is simply rolled and inserted into the sampling tube 12, it can be set very easily. In the state of the close contact, as shown in FIG. 2, the synthetic resin sheet 30 is in a state where the edges are butted against each other (abutting portion is indicated by reference numeral 30c).
As shown in FIG. 3B, the folded portion 30a of the synthetic resin sheet 30 extends from the tip of the sampling tube 12 to the outer peripheral surface side. Next, the core catcher 18 is fitted, and the cutting shoe 16 is connected to the sampling tube 1.
By screwing the synthetic resin sheet 30 and the core catcher 18 into the tip portion of the second member 2, the sampling tube 12 and the cutting shoe 16 hold the synthetic resin sheet 30 and the core catcher 18, so that there is no possibility that the synthetic resin sheet 30 shifts when soil is collected. This completes the assembly of the soil sampler.

The soil sampler 10 thus assembled
A penetrating rod (not shown) is connected to the connector head 14 of FIG. Then, it is inserted into the soil sampling point, and is pushed into the ground by applying a pushing force from the surface of the ground to the penetrating rod with a hydraulic pressure or a hydraulic device, or by applying a striking force by a hammer or a falling weight. The soil is a cutting shoe 1
6 and pushed into the sampling tube 12. At this time, since the core catcher 18 is deformed so as to be in close contact with the synthetic resin sheet 30, the accommodation of the soil sample is not hindered. If the penetrating rod is pulled up after being pushed in, the soil sampler 10 rises, and the collected soil tends to be left behind.
Are spread, and the falling off of the soil sample is prevented.

The soil sampler 10 pulled up can be visually inspected for soil samples collected by dismantling, and can be used for various inspections and tests.
Measurement can be performed immediately. First, the cutting shoe 16 is turned and removed from the sampling tube 12, and the core catcher 18 is removed. Next, the folded portion 30a of the synthetic resin sheet 30 is returned to the original state, and the folded portion 30a is grasped and the sampling tube 1 is held.
2 is pulled out in the direction of the arrow (see FIG. 4A). Then, together with the synthetic resin sheet 30, the soil sample 40 wrapped therein is drawn out. Transparent synthetic resin sheet 3
Since 0 is used, visual observation of the soil sample can be performed in that state. Further, when the synthetic resin sheet 30 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 while being collected (see FIG. 4B).

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. Also, after collecting the soil sample, the frictional resistance between the soil sample 40 and the sampling tube 12 is
Since the frictional resistance between the synthetic resin sheet 30 and the sampling tube 12 is smaller and the soil sample 40 is wrapped and pulled out by the synthetic resin sheet 30, the soil sample 40 is hardly disturbed when being pulled out. Furthermore, since the whole soil sampler has a small diameter and a thin 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 collecting the soil sample 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 example weighs 3 kg.
The hammer of 0kg was able to drive enough. However, the conventional split-type sampler for the standard penetration test required a hammer weighing 63.5 kg. The difference in the weight of the hammer has a great effect 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 penetration tester can be used, the mobility is good and the efficiency of soil survey is remarkably improved.

[0018]

As described above, according to the present invention, the synthetic resin sheet is rolled and inserted into the inside of the sampling tube, and at the time of collection, the soil sample is wrapped with the rounded synthetic resin sheet, and after collection, the soil sample is synthesized. Since it is pulled out together with the resin sheet, the collected soil sample is slightly disturbed or compressed, but can be observed as it is, and the accumulation state can be sufficiently determined. In addition, since soil components can be easily and quickly measured, particularly in the case of collecting a soil sample containing a volatile substance, extremely accurate component measurements can be performed. Further, since the soil sampler according to the present invention can have a small-diameter thin-wall structure, the pushing force may be small, and the whole system can be reduced in size and weight. Therefore, it is excellent in mobility, and it is possible to efficiently collect, observe, and measure a soil sample.

[Brief description of the drawings]

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

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Soil sampler 12 Sampling tube 14 Connector head 16 Cutting shoe 18 Core catcher 30 Synthetic resin sheet 40 Soil sample

Claims (2)

[Claims] 1. A sampling tube forming a space for accommodating a soil sample therein, a connector head for connecting a penetrating rod fixed to a base end of the sampling tube, and a detachable detachable tip of the sampling tube. In a soil sampler having a cutting shoe and a core catcher mounted inside the distal end of the sampling tube, a synthetic resin sheet is rolled and inserted inside the sampling tube, and the synthetic resin sheet is A soil sampler which is mounted so as to be in close contact with almost the entire inner circumference, and wherein the soil sample is wrapped with the rounded synthetic resin sheet at the time of soil collection. 2. The cutting shoe is detachable by screwing into the tip of the sampling tube.
The synthetic resin sheet is a transparent sheet made of polyvinyl chloride, and the width of the synthetic resin sheet is substantially the same as the inner circumferential length of the sampling tube, and the length is approximately equal to or greater than the length of the sampling tube, and a part of the outer portion is outside. 2. The soil sampler according to claim 1, wherein the bent portion and the outer periphery of the core catcher are sandwiched and fixed between a sampling tube and a cutting shoe.