JP2000001844A - Sampling device of sample soil in unsolidified state and sampling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sampling device and a sampling method of mixed soil in an unsolidified state as sample soil for examining the effect of the stirring and mixing of grouting hardener with soil in soil improvement work. SOLUTION: The side wall of a longer hollow cylinder body 2 with rigidity is notched at an optional opening angle from the cross sectional center of the cylinder body to have an opening section 3 in a state to properly leave part of the side wall over the whole longitudinal body, at the same time, a sample soil sampling device 1 having a front end cutter 6 and a sample soil prevention claw 7 on the front end of the opening section, if necessary, the sample soil sampling device 1 is built in directly after hardener is mixed with the soil, and it is pulled out after the optional time to sample the mixed soil in an unsolidified state without being disturbed in the direction of the depth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling device and a sampling method for sampling a mixed soil from an improved layer while a hardened material and soil mixed in soil improvement work and the like are in an unhardened state as a sample soil.

[0002]

2. Description of the Related Art Conventionally, ground improvement methods using a high-pressure injection stirring method or a mechanical stirring method have been widely implemented. In this case, in order to grasp the effect of stirring and mixing, the sampled soil is collected from the improved layer created in the stage where the mixed hardening material and the soil have been stirred and mixed immediately after the mixed soil has not been hardened, and the improved layer is stirred and mixed. You need to know the status. As a sampling method,
There is a method for collecting the sample soil by boring survey, but this method has a problem that it is large and costly. Therefore, generally, a method has been adopted in which a cylindrical pipe such as a PVC pipe is erected in the improved layer immediately after the hardening material and the soil are stirred and mixed, and the sample soil is collected.

[0003]

However, in this method, even if the uncured mixed soil is sludge-like, the sample soil causes a falling phenomenon due to friction of the inner circumferential surface of the pipe, and the sample soil having the entire improved layer thickness is removed. There is a problem that cannot be collected. Further, there is also a problem in that the sample soil falls out of the pipe only after the mixed soil has hardened to some extent at the time of withdrawing the pipe.

The present invention has been made in order to solve these problems, and it is possible to collect a sample soil of the entire improved layer thickness in an undisturbed state, and furthermore, it is a simple and simple method that does not require time for sample soil collection. It is an object of the present invention to provide an apparatus and a method for collecting a mixed soil in a hardened state.

[0005]

SUMMARY OF THE INVENTION The present invention has the following arrangement to solve the above-mentioned problems. In the ground improvement method by high pressure injection stirring method and mechanical stirring method,
A collection device for collecting mixed soil as a sample soil in an unhardened state from an improved layer formed by stirring and mixing the mixed hardening material and soil is a long hollow cylinder having rigidity, and a side wall of the hollow cylinder is provided. In a state where a part of the hollow cylindrical body is left, an opening is formed by cutting out a longitudinal side wall of the hollow cylindrical body at an arbitrary opening angle from the center of the cross section of the hollow cylindrical body. And an uncured sample soil sampling device provided with a tip cutter and a sample soil falling prevention claw according to the above. Further, the present invention is configured as a sample soil collecting apparatus in which a through hole for extraction is formed in an upper remaining portion of the hollow cylindrical body.

Further, in a soil improvement method using a high-pressure injection stirring method or a mechanical stirring method, a sampling device for sampling a mixed soil as a sample soil in an unhardened state from an improved layer formed by stirring and mixing a mixed hardening material and soil. Is a long hollow cylindrical body having rigidity, with a part of the side wall of the hollow cylindrical body left, and cut off 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. An opening is formed, and a tip cutter and a sample soil drop-off preventing claw are provided in the tip remaining part of the hollow cylinder as necessary, and a through hole for extraction is punched in the upper remaining part of the hollow cylinder. The installed uncured sample soil sampling device was installed in the improved layer immediately after the mixing of the hardened material and the soil, and after a certain period of time, the sampling device was pulled out of the improved layer and the unhardened state of the improved layer was mixed. Sample soil without disturbing the soil in the depth direction Is that was how to collect the sample soil uncured state to collect.

[0007] Since the present invention is configured as described above, the following operational effects can be obtained. By providing a sample soil sampling opening at an arbitrary opening angle over the entire length of the cylinder, the friction between the inner surface of the cylinder and the peripheral surface acting on the sample soil can be reduced, and the cohesive phenomenon of the sample soil is eliminated and the improved layer Sample soil of the entire thickness can be reliably collected. Although the opening angle is not limited, generally, when the opening angle of the hollow cylindrical body is 90 degrees or less, there is a case where it is not possible to reduce the peripheral friction just to eliminate the co-falling phenomenon of the sample soil, If the opening angle is 180 degrees or more, the adhesive force enough to hold the sample soil in the cylindrical body is lost, and the sample soil may fall off the cylindrical body. Therefore, it is preferable to set the opening angle to around 120 degrees. 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, so that twisting and bending of the cylindrical body can be prevented. By providing the sample soil falling-off prevention claw at the tip end remaining portion of the cylindrical body, the sample soil does not fall out of the cylindrical body, and can be pulled out at an arbitrary time after the cylindrical body is set up. By providing the tip cutter at the tip end remaining portion of the cylinder, the cylinder can be easily installed. By inserting a reinforcing rod or the like into the extraction through hole formed in the upper remaining portion and rotating the cylinder, it is possible to easily separate the sample soil in the sampling device from the mixed soil outside the sampling device. The collected sample soil can be easily confirmed from the opening.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on examples. FIG. 1 is an overall perspective view showing an example of the sampling apparatus of the present invention, FIG. 2 is a side cross-sectional view and a bottom view of a distal end remaining portion of the apparatus, and FIG. 3 is an explanatory view of an opening angle of the apparatus. FIG. 4 is an overall perspective view showing another embodiment of the collecting apparatus of the present invention, and FIG. 5 is a view showing steps of a collecting method of the present invention.

The sampling apparatus 1 has a long and rigid cylindrical body 2 as shown in FIG. 1 and an opening angle 8 as shown in FIG. 3 over the entire longitudinal direction and a hollow cylindrical body side wall as shown in FIG. The opening 3 is provided by notching while the portion 4 is left, and a tip cutter 6 and a sample soil falling prevention claw 7 are attached to the tip remaining portion 4a of the hollow cylindrical body. The through hole 5 is provided.

[0010] A method for collecting a sample soil using the above-configured sampling apparatus will be described with reference to FIG. The collecting device is pressed into the ground immediately after the hardening material and the soil are stirred and mixed to a predetermined depth by a human power or a backhoe bucket 10 and built. (See (a) of FIG. 5) After the completion of the installation, the reinforcing rod 11 or the like is inserted into the extraction hole 5 of the upper remaining portion 4a, and the sampling device 1 is rotated, and the sample soil 12 in the sampling device and the sampling device are rotated. The outer mixed soil 13 is completely cut off. (See FIG. 5B.) Thereafter, after an elapse of an arbitrary time, the sampling device 1 is pulled out by an appropriate pulling-out tool 14, and the sampling operation of the sample soil 12 is completed. (See (c) in FIG. 5)

Since the sample soil in the sampling 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 cylindrical body is not limited to the cylindrical shape, nor is the number of the remaining portions and the sample soil falling prevention claws limited, and further, a projection is provided instead of the through hole for pulling out. Various modifications are possible without departing from the spirit of the present invention, depending on site conditions such as soil properties. Needless to say, the sampling device and the sampling method of the present invention can be applied to the sampling of the original soil.

[0012]

As a result of sampling of the sample soil by the sampling apparatus and the sampling method according to the present invention, by providing an opening at an arbitrary opening angle over the entire length of the cylindrical body, the inner surface of the cylindrical body and the sample soil are formed. The acting peripheral friction can be reduced, the co-falling phenomenon of the sample soil can be eliminated, and the sample soil of the entire improved layer thickness can be reliably collected.

By providing the opening with a part of the side wall of the cylindrical body properly left, the remaining part functions to reinforce the cylindrical body, thereby preventing the cylindrical body from being twisted or bent. By providing the sample soil fall prevention claw at the tip end remaining portion of the cylindrical body, the sample soil does not fall out of the cylindrical body, and can be pulled out at an arbitrary time after the cylindrical body is erected. By providing a tip cutter at the tip of the cylinder, it is possible to easily install the cylinder, and it has been confirmed that the soil and soil can be easily collected in an undisturbed state. did it. Further, the sampling device and the sampling method of the present invention are very simple and effective sampling devices and methods.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of one embodiment of a sampling device of the present invention.

FIG. 2 is a side cross-sectional view and a bottom view of a tip remaining portion of the sampling device of the present invention.

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 sampling device of the present invention.

FIG. 5 is an explanatory view showing the steps of the sampling method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sampling apparatus 2 Cylindrical body 3 Opening part 4 Remaining part 4a Remaining tip part 4b Upper remnant part 5 Pull-out hole 6 Tip cutter 7 Sample soil falling prevention claw 8 Opening angle 10 Backhoe bucket 11 Reinforcing rod 12 Sample soil 13 Mixed soil 14 Extraction tool A Improvement layer

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Michio Bessho 2-17-4 Yanagibashi, Taito-ku, Tokyo Onoda Chemico Co., Ltd. F term (reference) 2D043 BA08 BB09

Claims (3)

[Claims] In a soil improvement method using a high-pressure injection stirring method or a mechanical stirring method, a sampling device for collecting a mixed soil as a sample soil in an unhardened state from an improved layer created by stirring and mixing a mixed hardening material and soil. Into a long hollow cylinder having rigidity, cut off the longitudinal side wall of the hollow cylinder at an arbitrary opening angle from the center of the cross section of the cylinder while leaving a part of the side wall of the hollow cylinder. An uncured sample soil collecting apparatus, wherein an opening is formed in a chipped manner, and a tip cutter and a sample soil falling-off preventing claw are provided as needed in a tip remaining portion of the hollow cylindrical body. 2. An uncured sample soil collecting apparatus according to claim 1, wherein a through-hole for extraction is formed in the upper remaining portion of the hollow cylindrical body. 3. A sampling device for collecting a mixed soil as an unhardened sample soil from an improved layer formed by stirring and mixing a mixed hardening material and soil in a ground improvement method using a high-pressure injection stirring method or a mechanical stirring method. A long hollow cylindrical body having rigidity, leaving a part of the side wall of the hollow cylindrical body, and cutting out 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. An opening is formed, and a tip cutter and a sample soil drop-off preventing claw are provided in a tip remaining portion of the hollow cylindrical body as necessary, and a through-hole for extraction is formed in an upper remaining portion of the hollow cylindrical body. Of the uncured sample soil in the improved layer immediately after stirring and mixing the hardened material and the soil, and after a certain time, withdrawing the sampling device from the improved layer, the uncured mixed soil of the improved layer As sample soil without disturbing in the depth direction A method for collecting uncured sample soil, which comprises collecting the soil.