JP4028518B2 - Sample soil collector - Google Patents

Description

  The present invention relates to a sample soil collector.

When building a house on soft ground, etc., a ground improvement method is generally performed in which the required number of improved pillars b as shown in FIG. Yes.
Since this improved column body b is constructed in the ground, it cannot be confirmed directly visually whether it is constructed as designed. Therefore, the sample soil is taken out from the improved column body b using the sampling device a, and the quality control of the improved column body b is performed by performing visual confirmation and other tests as necessary.

As shown in FIG. 5, the sampler a generally used in the past has a substantially cylindrical shape as a whole, and is formed in a positive direction (front part) with a sample soil inlet c and a sharp tip. In the reverse rotation direction (rear part), air holes d are provided so that the sample soil can be easily taken in. And this extractor a is attached to the lower part of the stirring blade e of the ground improvement stirring machine f which constructs the improved pillar body b, and is used (FIG. 6).
The sampling method is a method in which when the sampler a reaches the target depth of the improved column b, the sample blade is taken by rotating the stirring blade e forward, and then the sample blade is pulled up to the ground surface while rotating the stirring blade e backward. To do.

The above-described conventional sample soil collector has the following problems.
<1> When the sampler a is pulled up to the ground surface, sample soil at other depths enters from the air hole d, so that the sample soil cannot be analyzed at an accurate depth.
<2> Inside the improved column b, the trace of the collector a remains as a gap, and re-stirring is necessary.
<3> When the sample soil is taken in, the air hole d is small, so the air in the collector a does not escape from the air hole d and acts as a pressure resistance, and the sample soil is difficult to take in. Therefore, the stirring blade e must be rotated more than necessary, which is uneconomical in construction.
<4> Since the conventional sampler a is formed with the intake port c and the air hole d facing each other, particularly low-viscosity sample soil can be easily spilled by tilting the sampler a slightly. End up.
<5> The sample soil is difficult to observe.

  In order to solve the problems as described above, the sample soil collector of the present invention is attached to a stirring blade of a ground improvement stirrer in which an improved pillar is built in the ground, and samples soil at a target depth is collected. A sample soil collector, wherein an attachment portion configured to be detachable from the stirring blade, an opening for taking the sample soil in the forward rotation direction of the stirring blade, and a closed slope in the reverse rotation direction are formed. And a door that is provided on a side surface that constitutes the sampling part and can be opened and closed only outwardly.

  Further, the sample soil collector of the present invention is a sample soil collector that is attached to a stirring blade of a ground improvement stirrer for constructing an improved pillar in the ground and collects sample soil at a target depth. The mounting portion configured to be detachable from the stirring blade, the opening portion for taking in the sample soil in the forward rotation direction of the stirring blade, the sampling portion formed with a closed slope in the reverse rotation direction, and the sampling portion are configured. A door provided on a side surface, which can be opened and closed only by an outward opening; a closing plate pivotally supported by the opening; the closing plate capable of closing the opening; and an earth pressure receiving plate protruding from the closing plate; And when the stirring blade moves in the forward rotation direction, the opening and closing lid rotates to open the opening, and when the stirring blade moves in the reverse rotation direction. The opening / closing lid rotates to close the opening.

  Further, the sample soil collecting device of the present invention is characterized in that, in the sample soil collecting device described above, the opening portion has a long opening width along the stirring blade and a low opening height. .

Further, the sample soil collecting device of the present invention is characterized in that, in the sample soil collecting device described above, the bottom surface constituting the collecting portion is constituted by the stirring blade.

The sample soil collector of the present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> The sampling device of the present invention has an opening in the forward rotation direction of the stirring blade and forms a closed slope in the reverse rotation direction. When the sampler is moved up and down in the improved column, the sampler is moved by rotating the stirring blade in the reverse direction, and is collected by rotating it only when collecting the sample soil at a required depth.
Therefore, unnecessary improved soil is not taken in, and only sample soil at a target depth can be collected.
<2> The collector is provided with a closed slope in the reverse rotation direction of the stirring blade, and its cross section is horizontally long and low in height along the stirring blade. Difficult to make. This saves the trouble of re-stirring and is economical.
<3> The sampling device of the present invention is provided with a door that can be opened and closed only on the side surface of the sampling part, and can be a large air hole that also serves as a sample soil passage hole without being restricted by size. For this reason, the air in a collection part can be pushed out outside at the time of sampling of sample soil, and sample soil can be taken in easily. As a result, the sample soil can be reliably collected by only rotating the stirring blade at a minimum.
The door provided in the crossing direction with respect to the <4> opening also has a function as a lid.
Therefore, the collected sample soil can be reliably stored without spilling even the sample soil with low viscosity.
<5> By configuring the bottom surface of the sampling section with a stirring blade, the sample soil can be easily observed by simply removing the sampling device from the stirring blade and turning it over.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Overall configuration The sampling device 10 according to the present invention is a sampling device for sampling the improved soil at a desired position of the improved column body, and as shown in FIG. The mounting portion 20 is configured to be detachably attached to the wing 70, the sampling portion 40 is provided with an opening 30 for taking in the sample soil, and the door 50 is openable and closable only at the outer opening provided on the side surface of the sampling portion 40. Is.
Here, the ground improvement stirrer is a structure in which the solidified material slurry and the local soil are mixed and stirred to construct an improved column body, and a rotating shaft 71 having a drilling head and a solidified material slurry discharge port at the tip. Is provided on a column of a base machine (not shown) so as to be movable up and down, and a stirring blade 70 for projecting and / or stirring the ground is provided at the tip of the rotary shaft 71 so as to project.
Hereinafter, each part which comprises this invention is explained in full detail.

<2> Attachment part The attachment part 20 is a part which comprises the extraction | collection part 40 so that attachment or detachment to the stirring blade 70 is possible (FIG. 1).
The mounting portion 20 can be configured to grip the stirring blade 70 freely in the thickness direction of the stirring blade 70, for example. In this form, as shown in FIG. 3, two steel materials having an L-shaped cross section are arranged to face each other in the width direction along the cross-sectional shape of the stirring blade 70, and one is placed below the sampling unit 40 described later. What is necessary is just to fix (fixed part 21) and to attach the other to the thickness direction of the stirring blade 70 so that sliding is possible (movable part 22). Thus, after the stirring blade 70 is inserted between the fixed portion 21 and the movable portion 22, the movable portion 22 can be gripped by sliding toward the stirring blade 70. By forming elongated holes 24, 24 extending in the sliding direction in the movable part 22 and attaching the bolts 25 to the nut parts 23 formed in the sampling part 40 through the elongated holes 24, the tightening of the bolts 25 can be adjusted. The movable part 22 can be fixed and slid freely. You may provide the opening of the opening part 30 in this movable part 22 as needed.
In addition, the form of this attachment part 20 is not necessarily limited to the above-described form, and any form can be adopted as long as it can be detachably attached to the stirring blade 70.

<3> Collection unit (FIGS. 1 and 3)
The collection unit 40 is a part that collects sample soil and temporarily stores it, and forms an opening 30 in the forward rotation direction of the stirring blade 70 and a closed slope 31 in the reverse rotation direction.

The depth of the collection unit 40 is set to be approximately the same length as the width of the stirring blade 70, and the width of the collection unit 40 is arranged on the side surface at an interval shorter than the length of the stirring blade 70. And the door 50 mentioned later is provided in this side surface.
The upper surface of the sampling part 40 is formed of a single plate material continuous with the closed slope 31 and the bottom surface is in an open state. The bottom surface is configured to be closed with a stirring blade 70.
The closed slope 31 is formed so that the earth pressure acting on the main body of the extractor 10 becomes as small as possible when the stirring blade 70 moves in the reverse rotation direction. For example, the closed slope 31 is provided in parallel with the rotation locus drawn by the stirring blade 70. Thereby, the earth pressure resistance exerted on the collector 10 can be reduced.

The opening 30 has a shape in which the opening width is formed horizontally along the stirring blade 70 and the opening height is set low.
The opening width is set to be relatively longer than the opening height. The ratio between the opening width and the height is preferably set so that the viscosity of the sample soil is taken into consideration, and the height is set low so that the collector 10 does not create a passage in the improved column.

The sampling part 40 is preferably formed by assembling commonly used steel materials by welding, and the surface thereof is preferably subjected to required rust prevention processing.

<4> Door (Figure 1)
The door 50 is configured to be openable and closable that can only be opened outward.
The door 50 is opened to the outside when the sample soil is pressed from the inside of the collection unit 40, and is closed when the pressure is applied from the outside.

The door 50 may be of a so-called reverse valve structure, such as a plate piece formed of an elastic member such as rubber, which can be freely opened and closed, or a plate member attached to the side surface of the sampling unit 40 with a hinge.
By providing the door 50, the sample soil can be easily taken into the depth of the sampling unit 40, and when the sample soil passes through the sampling unit 40, the sample soil that has been cut out from the improved pillar body that is not pressed is collected. Can do. Therefore, it is preferable that the door 50 be provided at a position as deep as possible which is separated from the opening 30 of the collection unit 40.

<1> Attaching the collector The improved pillar is constructed using a ground improvement stirrer.
The improved pillar body is formed by stirring and mixing with the excavated soil while discharging the solidified material slurry from the discharge port after performing an air digging to a predetermined depth in the ground with the drilling head and the stirring blade 70.

Next, the extractor 10 of the present invention is attached to the agitator 70 of the ground improvement agitator that has been pulled up.
The collector 10 is arranged so that the opening 30 faces the forward rotation direction of the stirring blade 70. The mounting portion 20 is loosened in advance with bolts 25, 25 so that the movable portion 22 can be slid and inserted from the side of the stirring blade 70.
After the extractor 10 is inserted to a predetermined position of the stirring blade 70, the movable portion 22 is moved to firmly sandwich the stirring blade 70, and the bolts 25 and 25 are tightened and fixed.

<2> Sampling of Sample Soil After the collector 10 is mounted on the stirring blade 70, the ground improving stirrer is inserted into the improved column while reversely rotating (FIG. 2).
When the stirring blade 70 rotates in the reverse direction, the collector 10 is subjected to earth pressure action from the closed slope 31 side. However, since the closed inclined surface 31 forms a surface substantially parallel to the pressure receiving direction, it hardly receives earth pressure. Therefore, the possibility that a passage mark is created inside the improved column body is extremely low.
Moreover, since the opening part 30 of the sampling machine 10 will be in the state opened to the rear side with respect to the moving direction, the improved soil will not enter the sampling part 40.

When the collector 10 reaches a predetermined depth, the ground improvement device is rotated in the forward rotation direction.
When rotated in the forward rotation direction, the opening 30 of the extractor 10 is opened in the rotation direction, and the sample soil is taken in from the opening 30.
When the sample soil is taken into the collection unit 40 and enters the depth of the collection unit 40, the sample soil presses the door 50, and the door 50 is opened outward. Thus, the sampling soil 40 is filled with the sample soil.
In the unlikely event that the improved soil has entered before the collector 10 reaches the predetermined depth, the unnecessary improved soil that has entered earlier is rotated by rotating the rotating shaft 71 more than the required rotation angle. And only sample soil at a predetermined depth may be collected.

<3> Pulling up the collector The sampler 10 is pulled up on the ground while rotating in the forward direction as much as necessary to collect the sample soil and then rotating in the reverse direction.
When reversely rotated, the door 50 of the extractor 10 is subjected to earth pressure, and the door 50 is closed.
When the stirring blade 70 rotates in the reverse direction, the stirring blade 70 moves toward the ground surface while pushing down the improved soil downward (FIG. 2). As a result, even if a void is generated inside the improved column body, the collector 10 is mounted on the upper part of the stirring blade 70, so that the lower surface of the stirring blade 70 functions effectively. By such an action, it is possible to construct a strong improved column body having no voids.

<4> Confirmation of sample soil The sampler 10 is lifted on the ground and then removed from the stirring blade 70.
The bolts 25, 25 are removed to disassemble the movable part 22, the sampling part 40 is removed from the stirring blade 70, and the sample soil is confirmed by turning it over.
From the sample soil thus collected, it is possible to visually confirm the mixing ratio and the mixing state, and if necessary, a specimen can be prepared and the strength can be confirmed from a compression test or the like.

<Embodiment 2 of the Invention>
Other embodiments will be described below. In the following description, the same parts as those described above are denoted by the same reference numerals, and detailed description thereof will be omitted.
In the present embodiment, as shown in FIG. 4, the opening 30 is provided with a rotatable opening / closing lid 60, and when the stirring blade 70 rotates, it receives the earth pressure action of the improved soil, The opening 30 can be opened and closed.

The opening / closing lid 60 is a member composed of a closing plate 61 that closes the opening 30 and a pressure receiving plate 62 that receives earth pressure by the rotation of the stirring blade 70, and the closing plate 61 and the pressure receiving plate 62 intersect with each other. To form.
The opening / closing lid 60 is provided with pin-shaped pivots at both ends where the closing plate 61 and the pressure receiving plate 62 intersect, for example, and is pivotally mounted on a cutout portion 41 in which the upper surface of the sampling portion 40 is cut out in a U-shape. If the pressure receiving plate 62 is disposed so as to protrude from the sampling unit 40, the pressure receiving plate 62 can be affected by earth pressure by the rotation of the stirring blade 70. The crossing angle between the blocking plate 61 and the pressure receiving plate 62 may be arbitrarily set according to the opening height of the opening 30.

Hereinafter, a method of using the collector according to this embodiment will be described.
First, the collector 10 is attached to the stirring blade 70.
Next, the sampler 10 is made to reach the target depth while rotating the rotating shaft 71 in the reverse direction. When the stirring blade 70 is rotated in the reverse direction, the improved soil that has passed through the closed inclined surface 31 exerts an action in the A direction on the pressure receiving plate 62.
In response to this, the opening / closing lid 60 rotates, and the opening 30 is closed by the closing plate 61. And the inside of the sampling device 10 will be in the state interrupted | blocked from the outside (solid line of FIG. 4).

After the collector 10 reaches the target depth, the rotating shaft 71 is rotated forward this time.
When the rotating shaft 71 is rotated forward, earth pressure in the opposite direction (B direction) is applied to the pressure receiving plate 62 when the rotating shaft 71 is rotated in the reverse direction.
When the pressure receiving plate 62 receives pressure, the opening / closing lid 60 rotates and the opening 30 is opened (two-dot chain line in FIG. 4). Then, a required rotation is applied to the rotating shaft 71 and the sample soil at the target depth is taken in.

After collecting the sample soil, the rotating shaft 71 is again rotated in the reverse direction. As a result, earth pressure in the A direction acts on the pressure receiving plate 62, and the opening / closing lid 60 is rotated to close the opening 30.
The sample soil at the target depth can be taken out by lifting the collector 10 to the ground surface while rotating in the reverse direction.
Thus, in the collector 10 of this form, since the sampling part 40 will be obstruct | occluded until the collector 10 reaches | attains the target depth, another improvement soil does not enter, and the sample of target depth Only soil can be collected reliably.

In this embodiment, the opening / closing lid 60 is provided in the opening 30. However, an elastic member such as rubber may be attached to one end of the opening 30 to close the opening 30. Also in this form, when the collector 10 moves in the forward rotation direction, the rubber is bent inward by the earth pressure, and the sample soil can be collected.

<Third Embodiment of the Invention>
Although the above collector 10 comprised the bottom face of the collection part 40 with the stirring blade 70, it is not necessarily limited to this form.
For example, a plate material (hereinafter referred to as a bottom plate) that closes the opening can be newly provided on the bottom surface of the collection unit 40 (not shown). Thereby, the sample soil can be confirmed as it is taken in when the collector 10 is removed from the stirring blade 70.
Such a form is particularly useful when the viscosity of the sample soil is low.
The bottom plate may be slidably attached to the opening 30 side.

The schematic perspective view of the extractor of this invention. Explanatory drawing of the state which attached the extractor to the stirrer. Exploded view of the collector. The figure which showed Embodiment 2 of the extractor. The figure which shows the conventional extractor. The figure which attached the conventional extractor to the stirrer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Sampling device 20 ... Mounting part 30 ... Opening part 31 ... Blocking slope 40 ... Sampling part 50 ... Door 60 ... Opening / closing lid 61 ... Closing plate 62 ... · Pressure plate 70 · · · stirring blade a · · · collector b · · · improved column c · · · intake d · · · air hole e · · · stirring blade

Claims (4)

It is a sample soil collector that is attached to the agitating blade of a ground improvement agitator that constructs an improved pillar in the ground, and collects sample soil at a target depth,
A mounting part configured to be detachable from the stirring blade;
Forming an opening for taking in the sample soil in the forward rotation direction of the stirring blade, and a sampling part forming a closed slope in the reverse rotation direction;
It is characterized by comprising a door that is provided on a side surface that constitutes the sampling part, and that can be opened and closed only for opening.
Sample soil collector.
It is a sample soil collector that is attached to the agitating blade of a ground improvement agitator that constructs an improved pillar in the ground, and collects sample soil at a target depth,
A mounting part configured to be detachable from the stirring blade;
Forming an opening for taking in the sample soil in the forward rotation direction of the stirring blade, and a sampling part forming a closed slope in the reverse rotation direction;
A door provided on the side surface constituting the sampling unit, which can be opened and closed only to the outside;
It is composed of a closing plate that is pivotally supported by the opening and that can close the opening, and an opening and closing lid that includes a pressure plate of earth pressure protruding from the closing plate.
When the stirring blade moves in the forward rotation direction, the opening / closing lid rotates to open the opening,
When the stirring blade moves in the reverse rotation direction, the opening / closing lid rotates to close the opening.
Sample soil collector.
In the sample soil collector according to claim 1 or 2,
The opening is characterized in that the opening width is elongated along the stirring blade and the opening height is set low.
Sample soil collector.
In the sample soil collector according to any one of claims 1 to 3,
The bottom surface constituting the sampling part is configured by the stirring blade,
Sample soil collector.

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