JPH11241980A - Shaping method of soft rock material and frozen earth and shaping device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the state of a collected sample as much as possible so as to keep a constant quality and to save the labor for manufacture. SOLUTION: When a cylindrical sample consisting of a soft rock material or frozen earth is shaped by rotary cutting by this method, the shaping is performed under an atmosphere such that the natural material property possessed by the soft rock material or frozen earth is not changed as for as possible. This device has a bearing support 3 interlocked with a motor 5 for rotating a sample 7, the other bearing support 4 having a sample pressing set part 41, and a cutter movable in parallel to and at a right angle to the axial center direction of the bearing supports 3, 4. This device has a curing box 2 enclosing the bearing supports 3, 4 and the cutter, and an atmosphere forming vessel 6 and a thermometer-hygrometer 8 are provided within the curing box 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder of constant quality with a small amount of turbulence for highly accurately evaluating the physical properties of a collected core in a basic survey (ground survey) of an earth structure in the field of civil engineering and construction. The present invention relates to a method for shaping a specimen and an apparatus for shaping the same.

[0002]

2. Description of the Related Art Conventionally, in the investigation of the ground, which is an earth structure in the field of civil engineering and construction, soft rock materials are generally collected using a triple tube core tube or the like. After cutting the sample at the position to be tested, immediately set it on the lateral shaping device. Such a soft rock material is extremely sensitive to a change in the water content inside the sample, so it is important not to change the water content at the time of collection as much as possible. Therefore, for shaping the side surface and the end surface, it is necessary to take measures to suppress the change in water content at the time of sampling. The frozen soil is prepared by draining a sample in advance at the site, freezing it with dry ice, liquid nitrogen, or the like, bringing it into the room, and quickly preparing a specimen while it is not melted, and setting the specimen in a test apparatus.

Conventionally, shaping of soft rock or frozen soil has been performed manually using a straight edge or a knife, so that the influence of disturbance due to a change in the sample state or a difference in individual skills is large. However, it is not only difficult to produce a high-quality test specimen, but also it takes a lot of time and effort to produce the specimen.

[0004]

Under these circumstances, the present inventors have conducted various studies on the preparation of a specimen with high accuracy and which does not require much labor for the preparation, and found that the state of the collected sample was minimized. It is understood that it is necessary to ensure that the conditions are not changed, that anyone can work without a high level of skill and labor, and that a certain level of quality can be ensured (ensure the stability of the finished product). This is based on knowledge. Accordingly, the problem to be solved by the present invention is to provide an excellent cylindrical specimen shaping method and a shaping apparatus which maintain the state of a collected sample as much as possible, have a constant quality, and require no trouble in production. It is in.

[0005]

The above objects of the present invention are achieved by the following inventions.

(1) A method for shaping a cylindrical specimen made of a soft rock material or frozen soil by a rotary cutting method, wherein the method is performed in an atmosphere in which properties unique to the material of the soft rock material or frozen soil are not changed as much as possible. How to shape the specimen. (2) The method for shaping a cylindrical specimen according to the above (1), wherein the formation of an atmosphere that does not change the state of the soft rock material as much as possible is performed by adjusting the moisture in the curing box. (3) The method for shaping a cylindrical specimen according to the above (1), wherein the formation of an atmosphere that does not change the state of the frozen soil as much as possible is performed using dry ice in the curing box. (4) A cutter is provided on each side of the bearing hand which has a bearing for a specimen rotatably on both sides thereof and which is movable in a direction parallel to the axis of the bearing and in a direction perpendicular thereto. In the cylindrical specimen shaping device that is, having a curing box surrounding at least these bearings for the specimen and the cutter, further inside the curing box is provided with an atmosphere forming container and a thermo-hygrometer, A cylindrical specimen shaping device having a manual handle for lateral movement interlocked with the cutter outside the curing box.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments. According to the present invention, in a method for shaping a cylindrical specimen made of soft rock material or frozen soil by a rotary cutting method, the method is performed in an atmosphere in which properties unique to the material of the soft rock material or frozen soil are not changed as much as possible. so,
Specimens obtained by this method can be obtained without changing the state of the collected sample as much as possible,
This is an excellent method that does not require an expert to perform the work.

In the method for shaping a cylindrical specimen according to the present invention,
By forming an atmosphere that does not change the state of the soft rock material as much as possible by adjusting the moisture in the curing box, a material of a constant quality can be easily obtained. Further, in the present invention, by forming an atmosphere that does not change the state of the frozen soil as much as possible using dry ice in the curing box, it is possible to easily obtain a constant quality.

Further, the cylindrical specimen shaping apparatus of the present invention has a specimen bearing hand rotatably on both sides, and a cutter movable in parallel with the axis of the bearing hands and in the direction perpendicular thereto. However, in the cylindrical specimen shaping device provided on the side of the bearing, there is provided a curing box surrounding at least these specimen bearings and the cutter, and further an atmosphere forming container is provided inside the curing box. And a thermo-hygrometer are provided, and the curing box is provided with a manual handle for lateral movement in conjunction with the cutter outside the curing box. Excellent effect that anyone can produce a constant high quality specimen in a short working time by a simplified cutting process that does not require skill and the side and end faces of the specimen are not changed as much as possible It is intended to achieve.

When the specimen of the present invention is manufactured, the sample brought into the room is generally taken larger than the dimension (diameter) of the specimen at the time of the physical property test, and the diameter is reduced to a predetermined dimension. High-precision shaping with less disturbance than before can be performed without changing the state of the sample. In the present invention, when shaping the specimen, the pretreatment of the sample differs between the soft rock material and the frozen soil as follows. First, soft rock material
Compressive strength of several kgf / cm ² ~300kgf / cm ² about soft rock material is used. For frozen soil, samples are frozen in advance at the site and brought into the room to prepare test specimens.

FIG. 1 is a schematic top view showing a cylindrical specimen shaping apparatus of the present invention, and FIG. 2 is a side sectional view showing a cylindrical specimen shaping apparatus of the present invention. In FIG. 1 and FIG. 2, there are bearings 3 and 4 for specimens rotatably on both sides, and one of these bearings 3 is interlocked with a motor 5 for rotating the specimen 7, The other bearing 4
Has a specimen holding set part 41. Further, a cutter 9 is provided which is movable in a direction parallel to the axis of the bearings and in a direction perpendicular to the axis of the bearings. It can be moved freely by a moving manual handle (not shown).

The cutter 9 is linked to a motor (not shown) provided on the side of the bearing so as to move in a direction approaching the specimen (perpendicularly). The curing box 2 further surrounds the bearings 3, 4 and the cutter 9 and the like. Inside the curing box 2, an atmosphere forming container 6 and a thermo-hygrometer 8 are provided. On the outside, a manual handle (not shown) for lateral movement is provided in conjunction with the cutter.

The curing box 2 is made of a transparent member so that the inside can be observed, and is preferably made of acrylic resin. When using this cylindrical specimen shaping device, a container 6 containing distilled water is installed below the position where the specimen 7 is set in the curing box 2 in advance, and the humidity in the curing box 2 is increased. The indoor temperature is about 20 degrees and the relative humidity is about 95%. The thermo-hygrometer may be commercially available for management. In the present invention, the cutter 9 is first brought close to the side surface of the rotating specimen 7 and is shaped by moving the cutter 9 with a manual handle that moves in the lateral direction. After the side face shaping is completed, the end face of the specimen is removed. Perform shaping. As for the shaping of the end face, the end face is shaped one by one using a cutting tool instead of the side face cutter.

On the other hand, for frozen soil, the sample is frozen in advance at the site and brought into the room. Therefore, in shaping, the container 6 in the curing box 2 is filled with dry ice instead of distilled water to reduce the internal environment. In a cold state of about 0 ° C. to −20 ° C., the side face and the end face are quickly shaped while suppressing the temperature rise as much as possible. The method is the same as for the soft rock material.

The method of shaping a cylindrical specimen made of a soft rock material or frozen soil by the rotary cutting method of the present invention is different from a cutting operation using a lathe and is simple enough to allow anyone to perform the operation without requiring advanced skills. It adopts a simplified cutting process. That is, the bearing (main shaft) is rotated while supporting the specimen 7, and the cutter is rotated at an arbitrary speed, and the cutter is manually fed to cut the side surface. The cylindrical specimen shaping device of the present invention has a feature that the rotation speed of the spindle, the type of cutter (for soft rock / for frozen soil), the rotation speed of the cutter, and the like can be selected and adjusted depending on the state of the sample to be used. doing. The shaping of the end face of the test piece 7 is a device capable of rotating the test piece 7 on the main spindle side and shaping the end face one by one using a cutting tool instead of a cutter.

[0016]

According to the method for shaping a cylindrical specimen of the present invention, the specimen obtained is obtained by performing the method in an atmosphere in which the properties peculiar to the material of the soft rock material or the frozen soil are not changed as much as possible. Obtained without changing the state as much as possible,
Moreover, it is an excellent method that does not require any labor and does not require a skilled worker to perform the operation. In the method for shaping a cylindrical specimen according to the present invention, by forming an atmosphere in which the state of the soft rock material is not changed as much as possible by adjusting the moisture in the curing box, a specimen of constant quality can be easily obtained. In the present invention, by using dry ice in the curing box to form an atmosphere that does not change the state of the frozen soil as much as possible,
Specimens of constant quality can be easily obtained.

Further, by using the cylindrical specimen shaping apparatus of the present invention, the state of the sample is not changed as much as possible, and the shaping of the side and end surfaces of the specimen is simplified by a simplified cutting process which does not require any skill. This provides an excellent effect that a constant high-quality specimen can be produced by the operation. Therefore, a highly reliable specimen with little variation can be obtained, and the physical properties (strength and deformation characteristics) required from various physical properties tests are also highly reliable. Contribute significantly to formulation.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a cylindrical specimen shaping apparatus of the present invention.

FIG. 2 is a schematic side view showing a cylindrical specimen shaping apparatus according to the present invention.

[Explanation of symbols]

1 Cylindrical specimen shaping device 7 Specimen 2 Curing box 8 Thermo-hygrometer 3, 4 Bearing 9 Cutter 5 Rotary motor (specimen side) 41 Specimen holding part 6 Container

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G01N 1/28 K

Claims (4)

[Claims] 1. A method for shaping a cylindrical specimen made of a soft rock material or frozen soil by a rotary cutting method, wherein the cylindrical specimen is formed in an atmosphere in which properties unique to the material of the soft rock material or frozen soil are not changed as much as possible. How to shape the specimen. 2. The method for shaping a cylindrical specimen according to claim 1, wherein an atmosphere that does not change the state of the soft rock material as much as possible is formed by adjusting the water content in the curing box. 3. The method for shaping a cylindrical specimen according to claim 1, wherein an atmosphere that does not change the state of the frozen soil as much as possible is formed using dry ice in the curing box. 4. A cutter having rotatable bearings for test specimens on both sides thereof, and a cutter which can be moved in a direction parallel to the axis of the bearings and in a direction perpendicular thereto. The provided cylindrical specimen shaping device has a curing box surrounding at least these specimen bearings and cutters, and inside the curing box is further provided an atmosphere forming container and a thermo-hygrometer. A cylindrical specimen shaping device having a manual handle for lateral movement linked to the cutter outside the curing box.