KR200179847Y1 - Very Large Diameter (VLD) Sampler - Google Patents

Abstract

The present invention relates to a VL Large Sampler, which has a drawback in that it is impossible to sample more than 100 mm in diameter.

The present invention can be used in conjunction with a conventional drilling machine as shown in Figure 1, the inner part that can be divided by the incision 4 in the outer case 1 having a jetting device 3 in connection with the connecting pipe (2) The tube 5 is provided to be elevated.

A guide pipe 6 and a connection pipe 2 are coupled to the upper end of the jetting device 3, and a rod 7 penetrates through the connection pipe 2, and the jetting device 3 is formed in a vertical direction. It is composed of two main water pipes (8) and a jetting circular pipe (9) in the horizontal direction, the injection nozzle (10) in which a plurality of high-pressure water supplied into the connecting pipe (2) perforated below the jetting circular pipe (9) It is intended to be sprayed on.

The outer case 1 is perforated with a plurality of tops 11 which can be easily discharged slimes (mixed with soil and water) to the outside, four shoes 12 at the lower end of the hinge ( 13) is installed so as to be folded inward, the wire rope 14 is coupled to the lower end of the shoe 12 is to be pulled from the upper side.

The inner tube 5 is left and right homogeneous about the incision 4 and is fastened by a fastening band 17, and the cross-shaped cover 18 is coupled to the bolt 19 on the upper side.

Description

VL Large Sample (VLD) Sampler}

The present invention is designed to minimize disturbances in various samples and to provide various depths in order to accurately evaluate the engineering characteristics of soft soils, which are the criteria for reviewing the constructability, stability, and economic feasibility in the construction of rivers or coastal areas where soft soils are distributed. Large buddhism with a diameter of 300 mm or more relates to a device capable of collecting a sample (300 mm or more).

In order to evaluate the engineering characteristics of the soft ground, in case of conducting the indoor test by taking the Buddhism eggs, the reliability of the test results is affected by the degree of disturbance of the samples. have. In addition, recently, large Buddhism eggs are required for consolidation test and deformation control shear test considering low cell orientation, anisotropy, etc., and especially large blocks by excavating the ground. In case of sampling, it is difficult to excavate trenches in the soft ground, which limits the sampling depth. Therefore, the development of a perfect sampler that minimizes disturbance and satisfies Buddhism eggs sampling conditions in the process of collecting large diameter samples at various depths for the soft ground is urgently required.

In general, the disturbance of the sample is roughly divided into the disturbance caused by the intrusion of the harvester and the disturbance caused by the release of the ground stress that the sample is in the natural state. The disturbance caused by stress release is an unavoidable disturbance caused by the removal of the restraint stress in the process of transporting from the underground stress state to the laboratory, sampling and forming. Therefore, the sampling process is important to minimize the disturbance of the sample, especially the efficiency of the harvester is the key. Buddhism is a representative indoor test that can grasp the degree of disturbance of the sample, and the consolidation curve by the consolidation test shows a gentle straight line horizontally until the initial consolidation load, as shown in Figure 3, and virgin consolidation after the preceding consolidation load. A sharp slope is shown along the curve. However, the disturbed sample shows a relatively gentle curve before and after the previous consolidation load, making it difficult to determine the clear consolidation load. Especially, various settlements such as the preconsolidation load (P'c), compression index (Cc) and consolidation coefficient (Cv) Since there is an error in the determination of the consolidation constant, there is a fear that decisive problems may occur in the calculation of the settlement and the settlement between the soft ground for marine and river construction.

Many studies have shown that the larger the diameter of the sample, the better the quality of the Buddhism eggs. In other words, when the diameters of Buddhism eggs were 2 inches (Bx), 3 inches (Nx), and 4 inches (Hx), respectively, the result of the comparative analysis on the degree of disturbance showed that the sample of 4 inches was the best, and at least 3 inches. Recommended use.

Bx and Nx are the main diameters of Buddhism eggs which are used all over the world at present.As a large sampler, the Sherbrooke Sampler developed in 1975 at the University of Canada Sherbrooke is a block sample. As a harvester, it was used to collect sensitive clay of 300mm diameter, but it is limited to specific soil and is not easy to transport and handle. Also, Buddhist eggs with diameter of 200mm at Laval University in Quebec, Canada The Label Sampler was introduced to collect the sample, but the degree of disturbance is relatively high because the sample is taken by overcoring method by the Teeth and Kater mounted on the tip. It was used for research purposes such as severe and difficulty in cutting and drawing samples. In particular, the NGI 200mm sampler was developed at the Norwegian Institute in 1977 as a large-diameter piston sampler, but it is used only for research because its area ratio is 26%, which is rather large.

As such, the development of large-diameter samplers has been difficult for a long time, and it is easy to damage the surrounding clay structure according to the tip shape during penetration, and the larger the diameter of the sample, such as cutting the sample in the ground and pulling out the sample during extraction, is solved. There are problems that are difficult to do, especially large Buddhism sampler is not easy to meet the following conditions (US Corps of Engineers, NAVFAC standards).

-No distortion or deformation of the sampler.

-There must be no empty space in the harvester or weakened.

-Specfic Recovery Ratio should be over 95%.

-The area ratio of the harvester must be within 15%.

The present invention is to solve the above-mentioned shortcomings, and has a large diameter of 300 mm or more necessary for various indoor dynamic tests conducted to grasp the engineering characteristics of the soft ground which is the most problematic problem in river or coastal area construction. The purpose is to accurately collect the sample without disturbing it at a deep depth.

The present invention satisfies the above-mentioned internationally proposed Buddhist eggs sample collection conditions and can be commercialized in a similar manner to the existing Buddhist eggs sampler and can be collected at a deep depth. The inner tube for sampling can be lifted in the outer case, and when the inner tube is lowered and the sample is pushed into the inner tube, the outer case with the jetting device is lowered next, and the shoe of the outer case is wired. Pulled by the rope to prevent the departure of the sample.

1 is an exploded perspective view of a sampler according to the present invention,

2 is a cross-sectional view of a sampler according to the present invention,

3 is a perspective view of the inner tube of the sampler is lowered according to the present invention,

Figure 4 is a perspective view of the outer cable lowered state of the sampler according to the present invention,

5 is an illustration of the disturbing effect of the consolidation test,

6 is a consolidation test control of the present invention and a conventional sampler sample.

<Explanation of symbols for main parts of the drawings>

1-outer case, 2-connecting pipe,

3-jetting device, 4-incision,

5-inner tube, 6-guide pipe,

7-rod, 8-hose,

9-jetted round pipe, 10-jet nozzle,

11-excavation, 12-shoe,

13-hinge, 14-wire rope,

15-rope guide, 16-rope guide hole,

17-fastening bands, 18-cross cover

19-Bolt.

The present invention will be described in detail with reference to the accompanying drawings.

The present invention can be used in combination with a conventional drilling machine, and the inner tube (5) which can be divided by the cutout (4) in the outer case (1) having a jetting device (3) connected to the connecting pipe (2) The installation is possible to lift.

The guide pipe 6 and the connection pipe 2 are coupled to the upper end of the jetting device 3, and the rod 7 penetrates the connection pipe 2.

The jetting apparatus 3 is composed of four main water pipes 8 formed in the longitudinal direction and a jetting circular pipe 9 in the horizontal direction, in which the high-pressure water supplied into the connecting pipe 2 is jetted circular pipe 9. It is to be injected into the injection hole 10 perforated a lot below.

The outer case 1 is perforated with a plurality of tops 11 which can be easily discharged slimes (mixed with soil and water) to the outside, four shoes 12 at the lower end of the hinge ( 13) is installed so as to be folded inward, the wire rope 14 is coupled to the lower end of the shoe 12 is to be pulled from the upper side.

The wire rope 14 is installed upward through the rope guide 5 in the outer case 1 and the rope guide hole 16 of the guide pipe 6.

The inner tube 5 is left and right homogeneous about the incision 4 and is fastened by a fastening band 17, and the cross-shaped cover 18 is coupled to the bolt 19 on the upper side.

The reason why the cover of the inner tube 5 is crosswise is to allow some disturbed sample to escape into the space between the crosses.

The detailed working method of the present invention composed of such devices is as follows, and it requires a somewhat skilled man, such as maintaining accurate depth, and because it is a large-diameter borehole, there is a possibility that collapse of the wall and defrosting depending on the ground conditions may occur. As a result, the collection work can be carried out while maintaining the stability of the cavity.

1. Drill to the required depth with a large bit by a rotary drill.

2. Remove the large bit from the lot of the drill and connect the VLD sampler to the lot and casing of the drill.

3. Align the lower end of the inner tube (5) with the jetting circular pipe (9) so that it is inserted into the drilled borehole and placed on the bottom.

4. Press the lot 7 connected to the cross cover 18 of the inner tube 5 by the hydraulic pressure of the drilling machine, and insert the inner tube 5 into the base plate. (See Example 3)

5. Lower the outer case (1) to the lower end of the inner tube (5) only by jetting.

6. Using the wire rope 14 connected to the shoe 12, close 2 to 4 shoes 12 according to the stratum conditions by manpower or hydraulic pressure on the ground to cut, support or cut the sample of Buddhism in the inner tube 5. Close it (see example 4).

7. Remove the body of the present invention (VLD sampler) from the borehole and separate it from the rod and casing of the drill.

8. Loosen the bolt 19 from the inner tube (5) of the present invention and remove the cruciform cover (18).

9. Buddhism eggs in the inner tube (5) After the ends are arranged and waxed, the inner tube (5) itself is transported to the test chamber.

The inner tube 5 was made of a PVC material having an inner diameter of 300 mm and a thickness of 8 mm, and the cut surface 20 at the tip of the tube was 60 °, thereby obtaining the results as shown in FIG. 4 and having an area ratio of 10% or less. It perfectly meets the sampling conditions, and in particular, it can be made of ABS, brass, etc., so that the area ratio can be further reduced. It is fixed.

In particular, the inner tube 5 is removed from the main body and transported directly to the laboratory to minimize the disturbance of the collected sample.

The outer case 1 prevents the cutting of the sample and the detachment of the sample by opening and closing the shoe 12 attached to the lower end, and by placing eight discharge holes 11 at the center, slimes due to jetting are moved to the outside. It is easy to discharge.

Jetting device (3) is the most important device of the present invention as the inner tube (5) pre-injected through the injection nozzle 10 of the jetting circular pipe (9) located in the front end portion of the outer case (1) only by jetting It is a device to descend below the lower end of the penetrated inner tube (5) is to have no effect on the collected Buddhism samples in the inner tube (5).

The present invention does not cause distortion, deformation and empty space of the sample, does not weaken the sample, and recovers 100% of the recovery rate.

In addition, in the case of large-diameter boreholes, there is a fear that the collapse of the ball wall and the bottom heap (Bottom Heave) may occur, but the present invention can be collected while maintaining the stability of the ball as a stabilizer.

In addition, in order to determine whether the sample collected by the present invention (VLD sampler) was disturbed, the sample was also collected with the existing piston sampler (Nx (3 inch)) at the same depth. The comparative analysis results show that the distribution of the consolidation curve is clear as shown in the example 4, in particular, the Buddhism eggs sample collected by the device of the present invention was confirmed to show overall better results than the sample of the conventional piston sampler.

As described above, the present invention satisfies the internationally proposed conditions for collecting Buddhism eggs, and it has been proved that perfect Buddhism eggs can be sampled from performance test results conducted in the field. Therefore, the development of the present invention minimizes disturbance and enables various engineering characteristics tests that require large-scale Buddhism eggs with a deep depth, and also secures up to 11 or more specimens per section in the laboratory with one large diameter sampling. (7 consolidation samples, 4 shear samples, etc.), it is effective to perform various engineering characteristics tests on the ground condition of the same depth.

Claims (6)

In the sampler that can be used in conjunction with a conventional drilling machine, VD sampler, characterized in that consisting of the outer case (1) and the inner tube (5) having a jetting device (3). The jetting apparatus (3) according to claim 1, wherein the jetting apparatus (3) is connected with a plurality of main water pipes (8) installed in a longitudinal direction and a jetting circular pipe (9) installed in a horizontal direction, and a plurality of jetting holes below the jetting circular pipe (9). The VDL sampler, characterized in that (10) is perforated to spray water. According to claim 1, wherein the outer case (1) is formed with a plurality of outlets 11 for slime discharge and the lower end is provided with a plurality of shoes 12 that can be folded around the hinge portion (13) Eldy Sampler. 4. The VD sampler according to claim 3, wherein a wire rope (14) is connected to an end of the shoe (12) to pull the wire rope from the ground to bend the shoe (12) inward. The VD sampler according to claim 1, wherein a cross cover (18) is coupled to an upper end of the inner tube (5). The VD sampler according to claim 1, wherein the inner tube (5) is detachable around the incision (4) and can be fastened by a fastening band (17).