JPH06346430A - Sampling method of soil - Google Patents

Abstract

PURPOSE:To sample soil easily without requiring power by means of a very simple device. CONSTITUTION:An auger screw 2 having approximately the same pitch of spiral wings 1 from the top to the bottom is revolved to advance from the ground surface 4 into the ground by using an appropriate driving source, and at that time, the auger screw is so revolved that it is made to advance in the ground by one pitch of the spiral wings 1 per revolution. In this way, after the auger screw 2 has been made to advance to the required depth in the ground, the auger screw 2 is pulled out from the ground without revolution, and after that, the soil adhering to the auger screw 2 is sampled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for collecting soil for collecting underground soil at a target location from the ground surface and performing chemical analysis on the soil.

[0002]

2. Description of the Related Art Conventionally, as a method for collecting this soil, as shown in FIG.
, A gear 52 is meshed with a screw rod 51 connected to the upper end of a cylindrical core 50, and the gear 52 is rotated by an engine 53 or the like to rotate the core 50 and at the same time to the upper end of the screw rod 51. When a worker pushes a lever 54 rotatably connected downward, a thrust force is applied to the core 50 to propel it into the soil.

When the core 50 alone does not reach the formation of the desired depth, the core 50 and the screw rod 51 are removed and the core 50 is replenished to reach the desired depth in the soil. When it reaches, the screw rod 51 is removed from the core 50, a fork (not shown) is built, the core 50 is pulled out from the ground by hydraulic pressure, etc., and the soil inside the core 50 is taken out to the outside, and the soil of the target formation Is being collected.

[0004]

However, in this method, the cylindrical core 50 is not propelled into the soil unless the operator pushes the lever 54 on the screw rod 51, so that the added core 50 is deeply buried in the soil. It takes a lot of effort to push it into. Further, when embedding the core 50 to a desired depth, a plurality of cores 50 must be sequentially added, which is a very troublesome work. Also, when the core 50 is pulled out from the soil, the soil is not destroyed by the core 5
It must be taken out of the 0 cylinder, but this work is extremely skillful.

Therefore, the present invention has been made in view of these points, and an object thereof is to provide a soil sampling method capable of easily sampling soil without using any force with an extremely simple device. It was done.

[0006]

According to the present invention, an auger screw whose pitch of spiral blades is substantially the same from bottom to top is propelled by rotating the auger screw from the ground surface to the soil using an appropriate drive source, At that time, the rotation of the auger screw is propelled into the soil by one rotation for one pitch of the spiral blade of the auger screw.

In this way, after propelling the auger screw to a desired depth in the soil, the auger screw is pulled out from the soil without rotating. After that, the soil attached to the auger screw was collected.

Further, when the auger screw is rotated and propelled into the soil, it is necessary to automatically propel the soil without breaking it. Therefore, the auger screw is rotated with a force that overcomes the shear strength of the soil, and the auger screw is also rotated. It is necessary to consider the shape of. Therefore, the outer diameter D (φ) and the lead angle θ of the spiral blade 1 of the auger screw 2 shown in FIG.
It was found from experiments that (°) is preferably 50 mm <Dφ <100 mm and 30 ° <θ <37 °.

[0009]

Since the auger screw has screw-shaped spiral blades with a sharp tip, it is automatically propelled into the soil when rotated by an appropriate drive source. Further, the rotation of the auger screw is propelled into the soil by one pitch for one pitch of the spiral blade of the auger screw,
Since the pitch of the spiral blades is almost the same from the bottom to the top, the spiral blades that enter the soil one after another by the auger screw enter along the loci of the spiral blades that have already entered the soil.

Therefore, the earth and sand that have entered between the spiral blades are retained as they are without roughening the layer in the earth. Then, if the auger screw is pulled out without rotating, the soil adheres between the spiral blades of the auger screw without breaking the fault system in the ground at the sampling location. This is because the distance between the spiral blades of the auger screw is not so large and the blades are spread to the outside of the shaft by a certain width, so that they are attached between the spiral blades together with the stickiness of soil.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. An auger screw 2 in which the pitch of the spiral blades 1 is substantially the same from bottom to top is prepared. The outer diameter D and the lead angle θ of this spiral blade 1 shown in FIG.
Dφ <100 mm and 30 ° <θ <37 °. Then, this is connected to the driving device 3, the spiral blade 1 is rotated, and
The auger screw 2 is propelled from the ground surface 4 into the soil as shown in FIG.

To this end, when the auger screw 2 is rotated, a thrust force into the soil is automatically generated by the spiral blade 1, so that the operator need only support the handle 5 of the auger screw 2. At that time, the rotation of the auger screw 2 is propelled into the soil by one pitch for one pitch of the spiral blade 1 of the auger screw 2.

After propelling the auger screw 2 to a desired depth in the ground, the handle 5 portion above the auger screw 2 is removed and only the auger screw 2 itself is left in the soil. And on this ground surface 4, as shown in FIG.
The gate-shaped support frame 6 is erected, and the upper horizontal frame 7 of this support frame 6
The wire tensioner 8 is connected between the auger screw 2 and the upper part of the auger screw 2, and the tensioner 8 is operated to
Pull out from the soil without rotating.

In this way, soil adheres between the spiral blades 1 of the auger screw 2 pulled up on the ground surface 4, and adheres in a state where the stratum at the relevant location remains almost unchanged. Therefore, collect these soils.

In the above embodiment, the gate-shaped support frame 6 and the wire tensioner 8 were used, but the present invention is not limited to this, and the auger screw 2 itself can be pulled out from the soil by an appropriate method without rotating. it can. It is optional to remove the handle 5 when pulling out.

[0016]

According to the present invention, since the auger screw generally used for digging is used, it is not necessary to prepare a core dedicated to the extraction of this soil as in the conventional case. Also, unlike the conventional method, in which the core is pushed by an operator to push it into the soil, the invention automatically pushes the core into the soil by rotating the auger screw, which significantly improves the labor of the operator. To be done. Moreover, since it is an auger screw, it can be used as a long single piece, and it is not necessary to add it one by one. Therefore, the work is extremely simplified.

Further, since the rotation of the auger screw is propelled in the soil by one pitch of the blades of the auger screw, it is possible to pull out the ground layer at the sampling point without breaking it. . Moreover, when the auger screw is pulled out, the soil remains attached to the place between the spiral blades of the auger screw as it is, so the soil at the desired place in the formation can be taken as it is, and the conventional tubular shape Unlike pulling the soil from the core, you can remove the soil very easily without any skill.

[Brief description of drawings]

FIG. 1 is a schematic view for explaining a preferable shape of a spiral blade of an auger screw used in the present invention.

FIG. 2 is a schematic partial cross-sectional perspective view showing a step of putting the auger screw of the embodiment of the present invention into soil.

FIG. 3 is a schematic partial cross-sectional front view showing a step of extracting the auger screw itself of the embodiment of the present invention from the soil.

FIG. 4 is a schematic partial cross-sectional front view showing a core burying step in a method using a conventional core.

[Explanation of symbols]

 1 spiral blade 2 auger screw 4 ground surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yohisa Kikuchi 5-3-10 Naka-Aoki-cho, Kawaguchi-shi, Saitama Tokio Electric Power Co., Inc. Kawaguchi Sales Office (72) Inventor Atsumi Tokuda 167 Iwabuchi, Matsumoto-shi, Chiba Prefecture Stock Company In-house (72) Inventor Hajime Miyata 3 27-12 Horikiri Katsushika-ku, Tokyo Inside Stock Company Yasuda Works

Claims (1)

[Claims] 1. An auger screw whose pitch of spiral blades is substantially the same from bottom to top is propelled from the ground surface into the soil,
The rotation of the auger screw is propelled into the soil by one pitch for one pitch of the blade of the auger screw,
After propelling the auger screw to the desired depth,
A method for collecting soil, which comprises extracting the soil from the soil without rotating the auger screw.