JPH0921290A - Sampling device for underground soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily sample soil at an optional underground position at an optional depth with a simple mechanism. SOLUTION: An insertion body 2 into the ground is rotatably connected to the lower end section of a shaft 1. A moving body 12 is screwed to the outer periphery toward the upper section of the shaft 1 at a fixed interval with the insertion body 2. The shaft 1 is made vertically movable against the moving body 12. The moving body 12 and the insertion body Z are connected by multiple plate springs 11 arranged on the outer periphery of the shaft 1. A storage interval 9 of soil is formed between the plate springs 11 and the shaft 1, and the plate springs 11 are curved and expanded outward when the moving body 12 and the insertion body 2 approach each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground soil sampling apparatus for sampling soil from the ground by using holes formed in conducting a Swedish sounding test.

[0002]

2. Description of the Related Art Conventionally, it has been generally practiced to collect underground soil and investigate its soil quality, water content and the like. And
There are roughly two methods of sampling. One of them is a sample sampling method that does not disturb the positional relationship of the soil to be sampled while keeping the positional relationship in the soil as it is. The other is that the structure of the soil is disturbed in situ, but if the only purpose is to compare the composition and water content, Even if there is no problem, it is a sampling method for a disturbed sample.

[0003]

SUMMARY OF THE INVENTION The present invention is directed to sampling a disturbed sample. As for sampling of the disturbed sample, conventionally, there are mainly an overboring method, a core boring method, a standard penetration test method, a sampling method from pits and trenches, and the like.
However, the conventional method has a drawback that the structure of the sampling device is complicated and that soil having an arbitrary depth in the ground cannot be arbitrarily sampled.

The present invention is intended to solve the above-mentioned problems, and makes it possible to sample soil at an arbitrary depth in the ground by a simple mechanism and perform various measurements. is there.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an insert body on the outer periphery in the upper direction of a shaft whose lower end portion is rotatably connected to the insert body. A movable body is screwed at a fixed interval, and the shaft can be moved up and down with respect to this movable body, and the movable body and the insert body are arranged by facing the outer circumference of the shaft by a plurality of leaf springs. The leaf spring and the shaft are connected to each other to form a storage space for soil, and the leaf spring can be curved and expanded outward when the movable body and the insert body approach each other.

The insert may have a water introducing chamber for accommodating groundwater therein.

Further, a pressing body is fixed to the outer periphery of the shaft covered with the leaf spring, which comes into contact with the inner surface of the leaf spring when the leaf spring is extended and presses the leaf spring so as to bend it slightly outward. May be

Further, the connection between the movable body and the insert body by the leaf spring may be carried out by detachably fixing the both ends of the leaf spring to the insert body and the movable body with screws.

[0009]

The present invention is constructed as described above,
The holes made during the Swedish sounding test are used to sample underground soil. In the Swedish sounding test, the load and the number of revolutions required to penetrate the screw point at the tip of the lot by 25 cm are measured, and the hardness and softness of the ground and the tightness are continuously examined.

By this test, a hole having a diameter of about 32 mm is formed in the ground at a constant depth. The insert is inserted into the hole created by this Swedish sounding test, but the guide pipe is connected to a boring chuck for performing the Swedish sounding test before inserting the insert.

Further, while the connecting shaft is connected to the upper end of the shaft inserted into the guide pipe, the insert is inserted into the hole formed by the Swedish sounding test to the required depth for sampling. When inserting the insert body to the required depth, the guide pipe is fixed to the upper end of the movable body, and the guide pipe is extendedly connected by the required depth. At the same time, it is possible to extend the required amount of extension shaft to be connected to the shaft in the guide pipe.

Then, when the leaf spring together with the insert reaches the depth required for sampling, the guide pipe or an extension guide pipe extendedly connected to the guide pipe is used as a tightening chuck of the Swedish sounding test apparatus. Fix it. With the guide pipe or the extension pipe of the guide pipe fixed to this tightening chuck, the shaft or the extension shaft extendedly connected to the shaft is rotated, so that the relative position between the shaft and the movable body. To move. Since the shaft is screwed to the movable body so as to be vertically movable, by rotating the shaft in the ascending direction, the insertion body is pulled up and the gap between the insertion body and the movable body is narrowed.

Further, by narrowing the distance between the movable body and the insert body, the leaf spring bends and expands outward. This curved expansion is
If a pressing body that presses the leaf spring to slightly bend outward is formed on the shaft, when the leaf spring narrows the gap between the movable body and the insert body, when the deformation to the leaf spring occurs, The leaf spring does not fold inward and can be reliably expanded outward. By this expansion, the leaf spring comes into contact with the inner surface of the inserted hole in the ground.

In the state where this leaf spring is expanded outward,
Rotate the guide pipe. Since the leaf spring spreads outward and contacts the inner surface of the inserted hole with a constant urging force,
The leaf spring also rotates with the rotation of the guide pipe, scrapes off the soil that comes into contact with the leaf spring, and stores the soil in the soil storage space formed in the space between the leaf spring and the shaft.

When the leaf springs are expanded outwardly, a gap is created between the leaf springs, so that the scraped soil is not always completely stored within the storage interval, but a necessary amount of soil is not stored. It flows into the storage space formed between the spring and the shaft. When the soil sampling is completed, the shaft is rotated in the opposite direction to lower the movable body in the opposite direction to move the movable body in the direction to widen the gap between the movable body and the insert body.

Since the leaf springs extend to the original position to narrow the gap between the leaf springs, the storage space can keep the closed state while holding the soil. Then, in this state, pull out the device from the hole and take it out,
By removing the leaf springs fixed to the movable body and the insert body with screws, it is possible to take out the soil sampled at the storage intervals.

If the inside of the insert is a water introducing chamber,
If water is present at the position where the insert is inserted, the water can be sampled and the presence of groundwater can be known.

As described above, the present invention inserts the insert and the leaf spring into the ground to an arbitrary depth and narrows the gap between the movable body and the insert at the insertion position to form the leaf spring. Since the soil can be easily scraped off by expanding it outward and rotating it, extremely simple soil sampling can be performed. In addition, after the soil is collected and stored within the storage space by opening the leaf spring, the leaf spring can be expanded by expanding the space between the movable body and the insert body, and the storage space can be closed. The sampled soil can be easily brought back to the ground.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (1) is a shaft, to the lower end of which an insert body (2) for inserting into the ground is rotatably connected. This insert body (2) has a tubular mounting frame (3) at its upper end detachably connected via a screwing portion (4), and at the lower end of this mounting frame (3) the shaft (1) and Secure the connection fixing plate (5) of the
By rotatably connecting (1), the shaft (1) and the insert body (2) are rotatably connected.

A double nut (6) is fixed to the lower end of the shaft (1) to prevent the shaft (1) from being detached from the connecting and fixing plate (5) when the shaft (1) is raised. Further, the connection fixing plate (5) has an opening for the groundwater inflow port (7). Further, a water introducing chamber (8) is formed inside the insert body (2) communicating with the inflow port (7) so that the water flowing in from the inflow port (7) can be stored.

Further, as shown in FIGS. 1, 6 and 12, the mounting frame (3) has a lower end of the leaf spring (11) connected and fixed by using a screw (10) on the outer periphery of the upper end. . This leaf spring (1
In 1), as shown in FIG. 6, four pieces are arranged in a quadrangle,
One end of each of them is arranged and fixed in a toe-like shape protruding outward from the end of the adjacent leaf spring (11).

The upper end of the leaf spring (11) is attached to the shaft.
A screw (13) is attached to the lower end of the movable body (12) screwed to the outer periphery of (1).
It is fixed by. As shown in FIG. 4, this fixing is also a tomo-type connection and fixing to the movable body (12). Also, in this connected and fixed state, the inner surface of the leaf spring (11) and the shaft
A storage space (9) for storing soil for sampling is formed between (1) and (1).

The movable body (12) has an inner peripheral thread groove (14) formed inside and an outer peripheral thread groove formed on the outer periphery of the shaft (1).
By screwing (15), it is possible to move up and down relatively to the shaft (1). Also this shaft
(1) is a ring-shaped pressing body, as shown in FIG. 5, in the storage space (9) at the central part in the vertical direction covered by the leaf spring (11).
(16) is fixed.

The pressing body (16) is composed of the insert body (2) and the movable body.
In the state in which the interval of (12) is the largest, as shown in FIG. 1 and FIG. 9, the leaf spring (11) has an outer shape such that the leaf spring (11) is slightly curved outward. It is shaped so that it contacts the inner surface and slightly presses the leaf spring outward.

The movable body (12) is screwed to the shaft (1), but the movable body (1) is fixed within a certain range of the shaft (1).
A sliding gap (17) is formed on the upper part of the inner peripheral screw groove (14) and the outer peripheral screw groove (15) so that it can be moved up and down relatively to (2).

A guide pipe (18) can be connected to the upper part of the movable body (12) if necessary. As shown in FIGS. 1, 3 and 11, the guide pipe (18) has a flange portion (20) fixed to the upper end surface of the movable body (12) with bolts (21) so that it can be extended and projected upward. There is.

In addition, at the upper end of the shaft (1), a rectangular protrusion (2
By extending 3), the extension shaft 22 can be connected to any number of upper parts. This extension shaft (22) connects the shaft (1) through the rectangular protrusion (23), so that the insert (2) or the leaf spring (11) is connected.
Always insert the shaft (1) even when the insert is inserted to the required depth.
It is configured to be able to rotate.

The guide pipe (18) is shown in FIG.
0, as shown in FIG. 13, a protrusion for positioning on the outer periphery of the upper end.
In the extension guide pipe (25) for extension that forms (24) and is connected to the upper end of the guide pipe (18), an L-shaped notch (26) is formed from the lower end surface, and the tip of the L-shaped end is formed. Further, the protrusion (24) is engaged with the notch (27) by further cutting it downward so that it can be continuously extended upward.

In the extension guide pipe 25, an extension shaft 22 for extending the shaft 1 is provided.
Is rotatably inserted as shown in FIGS.
In addition, a pressing bar (28) is provided between the shaft (1) and the extension guide pipe (25), and the extension guide pipe (25) is pushed upward with respect to the shaft (1),
The engagement between the protrusion (24) and the notch (27) is ensured.

In the structure constructed as described above, in order to sample underground soil, the device of the present invention is inserted into the hole (2) formed in the Swedish sounding test.
Insert from. This insertion should be carried out at a position relatively close to the ground surface, and if sampling is to be performed, the extension shaft described above
(22) and extension guide pipe (25) are not required. However, if you want to sample the soil at a deep position, extend the guide pipe (25) to the guide pipe (18).
The required amount of extension shaft 22 is sequentially connected to the shaft 1 to extend the shaft.

For this extension, the projection (24) protruding on the outer periphery of the guide pipe (18) is inserted into the L-shaped cut (26) of the extended guide pipe (25), and the L-shaped cut (26) is formed. By engaging the protrusion (24) with the notch (26) provided at the tip of the, the extension is continuously performed in the upward direction. In addition, since the shaft (1) and the extension shaft (22) are connected through a rectangular protrusion (23) protruding from the upper end of the shaft (1), rotation between the shaft (1) and the extension shaft (22) occurs. Power will be transmitted.

Then, with the insertion body (2) and the leaf spring (11) being inserted to the required depth, the guide pipe
(18) or the extension guide pipe (25) is fixed to a chuck (not shown) for Swedish sounding test. With the guide pipe (18) or the extension guide pipe (25) fixed by the chuck,
The shaft (1) or the extension shaft (22) is rotated in the ascending direction by human power or a prime mover.

Due to this rotation, the shaft (1) becomes a movable body.
(12) is screwed so that it can move up and down, and also has an insert.
Since the (2) is rotatably connected, the movable body (12) does not move in the ground, and the shaft does not move.
Only (1) will be raised.

As the shaft (1) rises, the insert
Since (2) is pulled up and moves in a direction of reducing the distance from the movable body (12), the leaf spring (11) connected and fixed between the movable body (12) and the insertion body (2). ) Will be bent and expanded outward. In this bending and expanding, press body
Since the leaf spring (11) presses the leaf spring (11) in advance so as to be slightly curved outward, the leaf spring (11) is securely bent outward without being bent inward. Be able to do things.

As shown in FIGS. 2 and 8, the deformation of the leaf spring (11) moves in the direction of increasing the distance from the shaft (1). Then, in this state, the guide pipe (18),
Alternatively, rotate the extension guide pipe (25) to move the leaf spring.
When (11) is rotated in the circumferential direction, the leaf spring (11) protruding outward scrapes the soil at the end in the rotation direction,
Take it in the direction of the shaft (1), and then the shaft (1) and the leaf spring.
Soil is stored in the storage space (9) formed at the space (11).

In the state where the underground soil can be sampled, the shaft (1) or the extension shaft (22) is
The shaft (1) is rotated in the direction opposite to the above to move the shaft (1) in a direction to increase the distance between the movable body (12) and the insert body (2). By the movement of the shaft (1), the leaf spring (11) is restored to the original position and the storage space (9) is closed. Therefore, when the device of the present invention is extracted from the ground, The stored soil can be reliably taken out to the ground without spreading outside from the storage space (9).

When there is groundwater in the ground to be sampled, water flows into the water introducing chamber (8) of the insert (2) through the inflow port, so that the water can be easily introduced into the water introducing chamber (8). It can be collected in).

After collecting the device of the present invention on the ground, screws (10) and (13) are attached to the insert body (2) and the movable body (12).
The sampling work can be completed by removing the leaf spring (11) fixed by and collecting the soil inside.

[0039]

As described above, according to the present invention, soil can be easily sampled at any depth in the soil.
Moreover, this is possible with a simple mechanism.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a soil sampling state in which a leaf spring is expanded outward with a gap between a movable body and an insert body narrowed.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a sectional view taken along line CC of FIG. 1;

6 is a cross-sectional view taken along the line DD of FIG.

FIG. 7 is a sectional view taken along line EE of FIG. 1;

FIG. 8 is a sectional view taken along line FF in FIG.

9 is a sectional view taken along line GG in FIG.

FIG. 10 is a partially cutaway view showing a state where an extension guide pipe is connected to the guide pipe.

11 is an enlarged view of a movable body portion of FIG.

FIG. 12 is an enlarged view of the insert body portion of FIG. 1.

13 is an enlarged view of a connecting portion between the guide pipe and the extended guide pipe of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 shaft 2 insert body 8 water introduction chamber 9 storage interval 10 screw 11 leaf spring 12 movable body 13 screw 16 pressing body 18 guide pipe 22 extension shaft 25 extension guide pipe

Claims (5)

[Claims] 1. A movable body is screwed to an outer periphery of an upper direction of a shaft, which is rotatably connected to an insert body at the lower end thereof, at a fixed interval from the insert body, and the movable body is attached to the movable body. On the other hand, the shaft can be moved up and down, and the movable body and the insert body are
Connected by a plurality of leaf springs arranged facing the outer circumference of the shaft, a soil storage space is formed between the leaf spring and the shaft, and the leaf spring bends outward when the movable body and the insert approach each other. Underground soil sampling device characterized by being able to expand. 2. The underground soil sampling apparatus according to claim 1, wherein the insert has a water introducing chamber for accommodating groundwater therein. 3. A pressing body is fixed to the outer periphery of the shaft covered with the leaf spring, which comes into contact with the inner surface of the leaf spring when the leaf spring is extended and presses the leaf spring so as to bend the leaf spring slightly outward. The underground soil sampling device according to claim 1. 4. The connection between the movable body and the insert body by a leaf spring is
2. The underground soil sampling apparatus according to claim 1, wherein both ends of the leaf spring are detachably fixed to the insert body and the movable body with screws. 5. A guide pipe is connected to an upper end of the movable body, an extension guide pipe can be continuously connected to an upper end of the guide pipe, and the extension guide pipe is connected to a shaft in the extension guide pipe. The underground soil sampling apparatus according to claim 1 or 4, wherein an extension shaft for extending the extension shaft is insertable.