KR19980036972A - Granulated soil sampler for granite weathering - Google Patents

Abstract

The present invention relates to a mechanism for collecting triaxial compression test samples of weathered granite soil without disturbing. It is an object of the present invention to provide a granulated weathering sample collector of granite weathered soil which can be molded into a form suitable for a direct triaxial compression test while collecting granite weathered soil which is weak to impact and difficult to be molded in a laboratory. In order to achieve this object, the extractor of the present invention is formed into a cylindrical sample mold for molding a sample, and after the molding is separated in the longitudinal direction, to take out the molded sample, and is inserted into the lower outer diameter of the sample mold, And a cylindrical blade having the same inner diameter as the inner diameter of the sample mold, and a connector inserted into the upper outer diameter of the sample mold to fix the sample mold to a predetermined support. The harvester of the present invention can be applied to the field of triaxial compression test of geotechnical engineering and other non-ranch samples.

Description

Granulated soil sampler for granite weathering

The present invention relates to a mechanism for collecting triaxial compression test samples of weathered granite soil without disturbing.

In the field of geotechnical engineering, triaxial compression test is the most widely used as the indoor experiment in the method of studying soil behavior. In the triaxial compression test, the boundary conditions and drainage conditions are clearly defined, and there is an advantage in that the experimental conditions can be selected relatively freely. Samples used in the two-triaxial compression test are used by reshaping a disturbance sample or by directly collecting a comparative egg sample, and using the comparative egg sample to study the strength characteristics of the field ground. This is very important.

In order to obtain a sample from the coarse soil, a sample is taken by pushing a thin tube into the ground.However, in the case of granite weather, also called Masato, it is weathered and becomes soil. It is very difficult at this time to collect the samples of the comparison eggs necessary for triaxial compression testing.

Although the conventional block sampling method is used to collect the samples of comparative weathered granite soil, the sample is easily broken during the molding of the sample into a shape that requires the triaxial compression test. The sample could not be molded.

In addition, as another method, there is a method of freezing the sample after molding and melting, but there is a problem that the meaning as a fertilizer is greatly reduced because the original properties of the soil changes when the sample is frozen.

Accordingly, the present inventors have diligently researched to solve the problems of the conventional technology described above, and as a result, the granite weathering soil, which is weak in impact and difficult to be molded in the laboratory, is collected at the site and simultaneously formed into a form suitable for the triaxial compression test. The harvester which can be developed was developed, and this invention was completed.

After all, it is an object of the present invention to provide a granulated weathering sample of granite weathered soil, which collects the granite weathered soil in the field and simultaneously forms a sample suitable for triaxial compression test.

(A) of FIG. 1 is a sectional front view of the extractor of this invention, (b) is sectional drawing of the X-X part of (a) figure.

2 is a detailed view of the sample mold 12 of FIG.

3 shows collecting a sample with the extractor of the present invention.

Explanation of symbols on the main parts of the drawings

11: cylindrical blade 12: removable sample mold

13: support connecting port 14: sample forming frame separation surface

21 air inlet 22 rubber tube

31: support 32: bearing

33: anchor 34: crossbar

35: support rod

Hereinafter, with reference to the accompanying drawings will be described the structure and operation of the comparative column sample collector (hereinafter abbreviated as the collector of the present invention) of the granite weathering soil according to the present invention. Figure 1 schematically shows the front cross-section of the harvester of the present invention, (b) is a cross-sectional view of the X-X part of (a). 2 is a cross-sectional view showing in more detail the sample forming frame 12 constituting the core of the present invention, Figure 3 is a schematic diagram showing the actual sample taken by the rewinder of the present invention.

1, the harvester of the present invention;

Cylindrical sample forming frame 12 for shaping the sample, and after the molding is separated in the longitudinal direction to take out the molded sample;

A cylindrical blade 11 inserted into a lower outer diameter of the sample mold 12 and having the same inner diameter as the inner diameter of the sample mold 12; And,

It is composed of a connector 13 is inserted into the upper outer diameter of the sample forming frame 12, the connector 13 for fixing the sample forming frame 12 to a predetermined support (see 31 in Fig. 3).

The symbols, D and H, shown on the sample forming frame 12 indicate diameters and heights of the samples, respectively, and these variables may be determined by the tester. Referring to FIG. 2, the sample mold 12 has an air inlet 21 perforated on one side thereof, and a rubber tube 22 made of a thin film on the inner wall thereof. Referring to FIG. 1 (b), it can be seen that the sample forming mold 12 is separated into both sides, and the separating surface 14 is indicated by a dotted circle. In addition, in Figure 2, the outer diameter of the upper and lower parts of the sample forming frame 12 is narrowed in a step shape, which is easy to insert the cylindrical blade 11 and the support connector 13 in the state covered with the rubber tube (22). To do so.

Referring to the operation of the harvester of the present invention configured as described above are as follows. This will be described with reference to FIGS. 1 and 2 and 3. 3 shows that the extractor of the present invention is fixed to the support 31, and both ends of the crossbar 34 to which the extractor of the present invention is fixed are connected to the support rod 35 by a bearing 32 to move up and down. The support 31 is grounded and fixed by the anchor 33.

First, the surface of the ground evenly flat, then place the support 31 and fix it with an anchor (33) and then connect the harvester of the present invention to the crosspiece 34 so that the blade 11 of the harvester touches the ground. Next, the soil around the blade 11 is excavated with a trowel, a knife or the like with a margin of about 1 mm from the cross-sectional area to be molded (the inner diameter of the sample mold 12).

When the collector is lowered by its own weight or with a suitable external force, the cylindrical blade 11 digs the soil into the sample mold 12 and the sample is molded into a desired shape. The inner wall of the sample mold 12 has a rubber tube in advance. (22) is covered to suck the air to the outside through the air inlet (21) so that the rubber film is expanded and in close contact with the inner surface of the sample forming frame (12).

In this way, when the sample is filled in the sample forming frame 12 and reaches the support connector 13, the air suction port 21 stops sucking the air so that the rubber membrane elastically packs the internal sample. Carefully cut the soil and separate the support 31 and the harvester to seal the upper and lower openings of the harvester with vinyl, etc. to transport to the laboratory.

In the laboratory, first, the support connector 13 is separated, and it is preferable to lightly press the sample inside the connector 13 so as not to receive a tensile force or to put a slight load on the connector 13 to separate it. The sample in this support connector 13 can also be used to measure the water content or site gap ratio, independent of the triaxial compression test.

Next, the sample mold 12 is turned upside down and the cylindrical blade 11 is pulled out. In this case, it is preferable to use the same method as that for removing the support connector 13 so that the sample is not subjected to the tensile force.

Finally, after selecting the sample on the upper and lower surfaces of the sample mold 12, a porous plate (porous stone) on both sides of the sample is separated from the sample mold 12 to the left and right. Since the sample molded inside is firmly packaged by the rubber tube 22, this sample can be a comparative egg sample suitable for the triaxial compression test.

As described above, according to the extractor of the present invention, granite weathered soil which is easily disturbed and impact-resistant can be formed at the same time as the sample is collected on site, so that a stable and excellent sample can be obtained as a sample for triaxial compression test, and the accuracy of the ground analysis There is an effect that can be.

Claims (4)

A cylindrical sample molding frame for molding a sample and separating the molded sample in a longitudinal direction after molding; A cylindrical blade having the same inner diameter as the inner diameter of the sample molding frame inserted into the lower outer diameter of the sample molding frame; And, Inserted into the upper outer diameter of the sample forming frame, consisting of a connector for fixing the sample forming frame to a predetermined support, granulated weathering sample of granite weathered soil. The method of claim 1, The inner surface of the sample mold is covered with a rubber tube, the sample is packaged by the rubber tube when separating the molded sample Granulated soil sampler for weathered granite soil. The method according to claim 1 or 2, The sample mold is provided with an air suction port, and before sample molding, the air is sucked out between the inner wall of the sample mold and the rubber tube so that the rubber tube expands in the outward direction of the sample mold, and after the sample molding, the air suction is performed. The rubber tube can elastically package the deformed sample Granulated soil sampler for weathered granite soil. The method according to claim 1 or 2, Upper and lower outer diameter of the sample mold is After the rubber tube is inserted stepwise narrowed so as not to interfere with the insertion of the blade and the connector Granulated soil sampler for weathered granite soil.