JP4463886B2 - Uncured sample soil collection device and collection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sampling device and a sampling method for sampling mixed soil from an improved layer as sample soil while the hardened material and soil mixed in ground improvement work and the like are in an uncured state.
[0002]
[Prior art]
Conventionally, ground improvement methods using a high-pressure jet stirring method or a mechanical stirring method have been widely implemented. In this case, in order to grasp the stirring and mixing effect, sample soil is collected from the improved layer created in the stage where the mixed soil immediately after mixing and mixing the mixed hardener and soil is uncured, and the improved layer is stirred and mixed. It is necessary to grasp the state.
As a sampling method, there is a sample soil sampling method by a boring survey, but this sampling method has a problem that it is large and expensive.
Therefore, generally, a method of collecting a sample soil by installing a cylindrical pipe such as a polyvinyl chloride pipe in an improved layer immediately after stirring and mixing the hardener and the soil is employed.
[0003]
[Problems to be solved by the invention]
However, this method has a problem that even if the uncured mixed soil is sludge, the sample soil is caused to fall down due to friction on the inner peripheral surface of the pipe, and the sample soil with the entire improved layer thickness cannot be collected.
In addition, there is a problem in that the sample soil falls out of the pipe unless the mixed soil is hardened to some extent at the pipe drawing time.
[0004]
The present invention has been made in order to solve these problems, and it is possible to collect the sample soil of the entire improved layer thickness in an undisturbed state, and it does not require time to collect the sample soil in a simple uncured state. It is intended to provide a sampling device and a sampling method for mixed soil.
[0005]
[Means for Solving the Problems]
The present invention has the following configuration in order to solve the above problems.
In the ground improvement method by the high-pressure jet agitation method or mechanical agitation method, the sampling device that collects the mixed soil as sample soil in an uncured state from the improved layer created by agitation and mixing of the mixed hardener and soil is a rigid long A hollow cylindrical body is formed, and a part of the side wall of the hollow cylindrical body is left, and an opening is formed by notching the longitudinal side wall of the hollow cylindrical body at an arbitrary opening angle from the center of the cross section of the cylindrical body. In addition, an uncured sample soil collecting device is provided in which a tip cutter and a sample soil fall-off preventing claw are provided as necessary at the tip remaining portion of the hollow cylindrical body.
Moreover, it is comprised in the sample soil sampling apparatus which drilled the through-hole for extraction | drawer in the upper part remaining part of the hollow cylinder.
[0006]
In addition, in the ground improvement method using the high-pressure jet agitation method or mechanical agitation method, the rigidity of the sampling device that collects the mixed soil as sample soil in an uncured state from the improved layer created by stirring and mixing the mixed hardener and soil A long hollow cylindrical body having a part of the side wall of the hollow cylindrical body left in the open, and a longitudinal side wall of the hollow cylindrical body is cut out at an arbitrary opening angle from the center of the cylindrical section. In addition, a tip cutter and a sample soil drop prevention claw are provided on the tip remaining portion of the hollow cylindrical body as necessary, and an extraction through hole is formed in the upper remaining portion of the hollow cylindrical body. The hardened sample soil collecting device is built in the improved layer immediately after the hardened material and soil are stirred and mixed, and after an arbitrary time, the sampling device is pulled out from the improved layer and the unhardened mixed soil in the improved layer is deepened. Collect as sample soil without disturbing the direction Is that was how to collect a sample soil in the uncured state.
[0007]
Since the present invention is configured as described above, the following effects are obtained.
(1) By providing the sample soil sampling opening at an arbitrary opening angle over the entire length of the cylinder, the friction between the surface of the cylinder and the sample soil can be reduced. The sample soil of the entire improved layer thickness can be reliably collected.
The opening angle is not limited, but generally, when the opening angle of the hollow cylinder is 90 degrees or less, there may be a case where it is not possible to reduce the surface friction enough to eliminate the co-falling phenomenon of the sample soil, When the opening angle is 180 degrees or more, the adhesion force for holding the sample soil in the cylinder is lost, and the sample soil may fall off from the cylinder, so the opening angle is preferably set to around 120 degrees.
{Circle around (2)} By providing the opening in a state where a part of the side surface of the cylindrical body is appropriately left, the remaining portion functions to reinforce the cylindrical body, and the twisting and bending of the cylindrical body can be prevented.
{Circle around (3)} By providing the sample soil drop prevention claw at the tip remaining portion of the cylinder, the sample soil does not fall off from the cylinder and can be pulled out at an arbitrary time after the cylinder is built.
(4) By providing a tip cutter at the tip remaining portion of the cylinder, it is possible to easily build the cylinder.
(5) Easily cut the edge between the sample soil inside the sampling device and the mixed soil outside the sampling device by inserting a reinforcing bar etc. through the through hole for extraction drilled in the upper remaining part and rotating the cylinder. Can do.
(6) The sample soil sample can be easily confirmed from the opening.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples.
FIG. 1 is an overall perspective view showing an example of the collection device of the present invention, FIG. 2 is a side sectional view and a bottom view of a tip remaining portion of the device, and FIG. 3 is an explanatory view of an opening angle of the device.
FIG. 4 is an overall perspective view showing another embodiment of the sampling apparatus of the present invention, and FIG. 5 is a diagram showing the steps of the sampling method of the present invention.
[0009]
As shown in FIG. 1, the sampling device 1 has a long and rigid cylinder 2 with an opening angle 8 shown in FIG. 3 over the entire longitudinal direction, and a side wall of the hollow cylinder as shown in FIG. In the state of being left out, an opening 3 is provided, a tip cutter 6 and a sample soil drop prevention claw 7 are attached to the tip residual portion 4a of the hollow cylindrical body, and a pull-out through hole 5 is attached to the upper residual portion 4b. It is the structure which perforated.
[0010]
A sample soil sampling method using the sampling apparatus configured as described above will be described with reference to FIG.
The sampling device is built into the ground immediately after stirring and mixing the hardener and the soil to a predetermined depth by human power or a backhoe bucket 10 or the like. (See (a) in Fig. 5)
After the completion of the construction, the reinforcing bar 11 or the like is inserted into the extraction through hole 5 of the upper remaining portion 4a and the sampling device 1 is rotated, so that the sample soil 12 inside the sampling device and the mixed soil 13 outside the sampling device are completely separated. Cut the edges. (See Fig. 5 (b))
Thereafter, after the elapse of an arbitrary time, the sampling device 1 is pulled out by an appropriate pulling tool 14, and the sample soil 12 is collected. (See (c) in Fig. 5)
[0011]
Since the sample soil in the collection device can be confirmed from the opening, it can be visually observed as it is, or the stirring and mixing state can be confirmed by a phenolphthalein reaction or the like.
The shape of the cylinder is not limited to a cylindrical shape, and the number of remaining portions and the sample soil drop-off prevention claws is not limited, and a protrusion is provided instead of the through hole for extraction. Various modifications can be made without departing from the spirit of the present invention in accordance with the field conditions such as soil quality.
Needless to say, the sampling apparatus and the sampling method of the present invention can also be applied to the sampling of raw soil.
[0012]
【The invention's effect】
As a result of sampling the sample soil with the sampling device and the sampling method according to the present invention, by providing the cylindrical body with an opening at an arbitrary opening angle over the entire longitudinal direction, circumferential friction acting on the inner surface of the cylindrical body and the sample soil Therefore, the sample soil of the entire improved layer thickness can be reliably collected without the phenomenon of co-falling of the sample soil.
[0013]
By providing the opening in a state in which a part of the side wall of the cylindrical body is appropriately left, the residual portion functions to reinforce the cylindrical body, and the twisting and bending of the cylindrical body can be prevented.
By providing the sample soil drop-off preventing claw at the tip remaining portion of the cylinder, the sample soil is not dropped from the cylinder, and can be pulled out at an arbitrary time after the cylinder is built.
By providing a tip cutter at the tip of the cylinder, it is recognized that the cylinder can be easily built, and it is possible to reliably collect the sample soil of the entire improved layer in an undisturbed state. did it.
The collection device and collection method of the present invention are a very simple and effective collection device and collection method.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of an embodiment of a sampling device of the present invention.
FIGS. 2A and 2B are a side sectional view and a bottom view of a tip remaining portion of the collection device of the present invention. FIGS.
FIG. 3 is an explanatory diagram of an opening angle of the sampling device of the present invention.
FIG. 4 is an overall perspective view of another embodiment of the collection device of the present invention.
FIG. 5 is an explanatory diagram showing the steps of the sampling method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sampling device 2 Cylinder 3 Opening part 4 Remaining part 4a Tip leaving part 4b Upper leaving part 5 Pull-out through-hole 6 Tip cutter 7 Sample soil drop prevention claw 8 Opening angle 10 Backhoe bucket 11 Rebar rod 12 Sample soil 13 Mixed soil 14 Extractor A Improved layer

Claims (2)

In the ground improvement method using the high-pressure jet agitation method or mechanical agitation method, the sampling device that collects the mixed soil as sample soil in an unhardened state from the improved layer created by stirring and mixing the mixed hardener and soil has rigidity A long hollow cylindrical body is opened with a part of the side wall of the hollow cylindrical body left, and the side wall in the longitudinal direction of the hollow cylindrical body is cut out at an opening angle near 120 degrees from the center of the cross section of the cylindrical body. An uncured sample soil collecting device, characterized in that a portion is formed. In the ground improvement method using the high-pressure jet agitation method or mechanical agitation method, the sampling device that collects the mixed soil as sample soil in an unhardened state from the improved layer created by stirring and mixing the mixed hardener and soil has rigidity A long hollow cylindrical body is opened with a part of the side wall of the hollow cylindrical body left, and the side wall in the longitudinal direction of the hollow cylindrical body is cut out at an opening angle near 120 degrees from the center of the cross section of the cylindrical body. In addition, an uncured sample soil collecting device in which an extraction hole is formed in the upper remaining portion of the hollow cylindrical body is placed in an improved layer immediately after stirring and mixing the hardener and soil. A method for collecting unhardened sample soil, characterized in that, after an arbitrary period of time, the sampling device is pulled out from the improved layer and the unhardened mixed soil of the improved layer is collected as sample soil without disturbing in the depth direction. .

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