JP4162124B2 - Sampling method and equipment by suction boring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sampling method and apparatus using suction-type boring, and in particular, a sampling method and apparatus for collecting undisturbed samples necessary for investigating mechanical properties such as strength and deformation of sandy ground or soil contamination. It is.
[0002]
[Prior art]
Conventional earth and sand sampling is performed by rotary boring and various types of sampling.
[0003]
[Problems to be solved by the invention]
Even with normal rotary boring and various types of sampling, it is very difficult to sample without disturbing the sample.
[0004]
Among various types of sampling, freezing sampling is a method in which the entire ground is frozen at the original position for earth and sand with a small amount of fine particles, and boring is performed in that state, and the sample is collected as an undisturbed sample.
[0005]
This freezing sampling has the problem that it takes a lot of equipment for collecting earth and sand samples, and it takes time to prepare and is expensive.
[0006]
On the other hand, volatile organochlorine compounds, which are the main targets of pollution investigations, are vaporized when exposed to heat.
[0007]
In addition, when water, which is a circulating fluid for sampling, is used, there is a possibility that the contaminated area is expanded by the contamination flowing out together with the water.
[0008]
In sediment sampling by rotary boring, it is necessary to send water for three purposes during excavation. The first is to carry the earth and sand debris excavated with a bit out of the hole. Second, the frictional heat generated by excavation is cooled. Finally, the hole wall is protected with a pore-holding agent. However, there is a problem that the collected sample flows out by the circulating fluid due to this water supply.
[0009]
[Means for Solving the Problems]
Therefore, in view of the above circumstances, the present invention is a sampling method by suction-type boring in sandy ground to be a suction-type sampling method that does not use circulating water, and includes an outer tube and an inner tube that accommodates a sample. And a suction pipe for sucking sandy soil placed between the outer pipe and the inner pipe, a handle for rotating the suction pipe, and the suction pipe for sucking sandy soil and fixing it to the outer pipe and the outer pipe The suction pipe is rotated to dig while sucking sandy soil, and a refrigerant injection pipe that partially closes the lower part of the lower end of the sample accommodated in the inner pipe and a heat insulating pipe that eliminates the influence on the surroundings are provided, and the upper opening of the outer pipe is provided. Close the lid with the cover plate, erect the rod and rotation control center rod for the outer tube at the center of the cover plate, fix the handle to the upper end of the rod and rotation control center rod for the outer tube, close the upper opening of the inner tube with the cover plate, and cover Stand the rod and rotation control center rod at the center of the plate, Insert the rod and rotation control center rod into the outer tube rod and rotation control center rod, suck the sandy soil with the suction tube, insert the inner tube into the ground, and store the sample. The lower end of the inner pipe is a sampling method by suction type boring in which the refrigerant injected pipe and the refrigerant injected by the heat insulating pipe that eliminates the influence on the surroundings are closed with frozen soil .
[0010]
Further, the present invention is a sampling device by suction boring in a sandy ground so as to be a suction type sampling device that does not use circulating water, and includes an outer tube , an inner tube that contains a sample, an outer tube, and an inner tube. The suction pipe that is placed between the pipe and sucks sandy soil, the handle that rotates the suction pipe, the sandy soil is sucked from the suction pipe, and the suction pipe fixed to the outer pipe and the outer pipe is rotated. It is equipped with a refrigerant injection pipe that digs up while sucking sandy soil and is housed in the inner pipe and partially closes the lower part of the lower part of the sample, and a heat insulation pipe that eliminates the influence on the surroundings. Stand the outer tube rod / rotation control center rod in the center of the plate, fix the handle to the upper end of the outer tube rod / rotation control center rod, close the upper opening of the inner tube with the lid plate, and insert the rod in the center of the lid plate. Rotation control center rod is erected and the inner pipe is provided with a predetermined gap in the outer pipe. Fit, and the sampling device according suction-type boring inserting the rod and rotation control center rod in the outer tube rod and rotation control center inside rod.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described in detail below based on a specific embodiment shown in the accompanying drawings.
[0012]
As shown in FIG. 1 and FIG. 2, the soil sampling apparatus by the present suction type boring is disposed between the outer tube 1, the inner tube 2 containing the sample, and the outer tube 1 and the inner tube 2. A suction tube 3 that sucks the outer tube 1, a rotating handle 4 that rotates the outer tube 1, sand is sucked from the suction tube 3, and the outer tube 1 and the suction tube 3 fixed to the outer tube 1 are rotated to dig into the inner A refrigerant injection tube 5 for closing the sample accommodated in the tube 2 is provided.
[0013]
The upper opening of the outer tube 1 is closed with a cover plate 6, an outer tube rod / rotation control rod 7 is erected at the center of the cover plate 6, and the rotation handle 4 is fixed to the upper end of the outer tube rod / rotation control rod 7. . Reference numeral 22 denotes a vent hole.
[0014]
The upper opening of the inner tube 2 is closed with a lid plate 8, a rod / rotation control center rod 9 is erected at the center of the lid plate 8, and the inner tube 2 is fitted into the outer tube 1 with a predetermined gap to rotate / rod. The control center rod 9 is inserted into the outer tube rod / rotation control rod 7. A suspension fitting 10 is screwed onto the upper end surface of the rod / rotation control center rod 9.
[0015]
As shown in FIG. 3, the suction tube 3 that rotates together with the outer tube 1 and sucks the outer tube 1 and the inner tube 2 with the lower ends positioned above the lower ends of the outer tube 1 and the inner tube 2 (about 5 mm). The circumference is arranged at a position where the circumference is evenly spaced, and is fixed to the inner surface of the outer tube 1. Six suction pipes 3 are communicated with the upper part of the suction concentrator 11 fixed to the base 35 of the rotating handle 4. The lower part of the suction concentrator 11 and the suction force control device / water / sediment storage device 12 are connected by a hose 13, and the upper part of the suction force control device / water / sediment storage device 12 is connected to the suction device.
[0016]
Reference numeral 14 denotes a negative pressure gauge, and reference numeral 15 denotes a suction force control valve (with an opening degree meter).
[0017]
The lower end of the sample accommodated in the inner tube 2 is closed.
[0018]
The refrigerant injection pipe 5 is made of metal, is positioned above the lower end of the inner pipe 2 (about 2 to 4 cm), and is arranged at a position where the circumference is equally distributed between the outer pipe 1 and the inner pipe 2, Temporarily fix between the outer tube 1 and the inner tube 2. The refrigerant injection pipe 5 is provided with a heat insulating pipe 34 made of acrylic or the like up to the lower end of the outer pipe 1 and fixed to the refrigerant injection pipe 5 in order to insulate the surrounding earth and sand on the outer periphery of the lower end portion. The refrigerant injection tube 5 is inserted into the lower end of the inner tube 2 and the heat insulating tube 34 is inserted from the lower end of the inner tube 2 by about 2 to 4 cm by press-fitting it from the lower end of the sample accommodated in the inner tube 2. This insulates the surrounding ground. The upper end of the refrigerant injection pipe 5 is communicated with a detachable cooling injector 16.
[0019]
A pulley 20 is rotatably provided on a support plate 18 supported by a support leg 17, and a wire 20 is hung. One end of the wire 20 is connected to a suspension fitting 10 on the upper end surface of the rod / rotation control center rod 9. The other end of the wire 20 is connected to the counterweight 21.
[0020]
As shown in FIG. 3, when a relatively hard ground (N value of about 30) is bored by suction, a loosening device 22 such as a needle for loosening the ground is provided at the tip of the suction tube 3 to make the suction height constant. Provide.
[0021]
The sample is collected by rotating the rotating handle 4 on the upper portion of the outer tube 1 and sucking the earth and sand with the suction tube 3, and inserting the inner tube 2 into the ground while keeping the strength of the tip ground constant. The loosened earth and sand are sucked with a vacuum or water through a suction pipe 3 mounted between the outer pipe 1 and the inner pipe 2 and discharged to the outside. Since the sample is collected by digging by sucking the earth and sand and discharging the loose earth and sand, a cutting bit is unnecessary.
[0022]
The sample tip is closed as follows.
[0023]
If it is shallow, excavate the area and cover the tip.
[0024]
In the case of earth and sand that is deep and has a low water content ratio, the lower end of the sample by the refrigerant injection system is closed with frozen earth 23 as shown in FIGS. The depth of the frozen soil 23 greatly depends on the state of the earth and sand and the temperature.
[0025]
In the case of sand that is deep and has a high water content ratio, it is blocked by a water jet drawing tube type or a wire drawing type as shown in FIGS.
[0026]
A storage 31 for storing the closing sheet 32 is provided on the outer tube 1 side of the inner tube 2, and the closing sheet 32 is stored in the storage 31 so that it can be taken out toward the lower end. On the other hand, a drawing tube 33 is provided between the outer tube 1 and the inner tube 2 facing the closing sheet 32, and the tip of the drawing tube 33 is connected to the lower end of the closing sheet 32. When the earth and sand at the lower end of the inner pipe 2 is loosened by a method of spraying water from the tip of the drawing pipe 33 or a wire drawing type, and then the drawing pipe 33 is pulled upward as shown in FIGS. The tip of the sample is closed with the closing sheet 32.
[0027]
【The invention's effect】
The present invention, as described above, a sampling method by the suction type borehole, sandy soil, and the outer tube, an inner tube for containing a sample, disposed between the outer and inner tubes sandy soil The suction pipe that sucks in, the handle that rotates the suction pipe, and the suction pipe sucks sandy soil, rotates the suction pipe fixed to the outer pipe and the outer pipe, and digs up while sucking sandy soil. Equipped with a refrigerant injection tube that partially closes the lower end of the sample housed in the tube and a heat insulation tube that eliminates the influence on the surroundings. The upper opening of the outer tube is closed with a cover plate, and the center of the cover plate serves as a rod for rod rotation control center Stand the rod, fix the handle to the upper end of the outer tube rod and rotation control center rod, close the upper opening of the inner tube with a lid plate, raise the rod and rotation control center rod to the center of the lid plate, A predetermined clearance is provided in the outer tube, and the rod / rotation control center rod is connected to the outer tube. Insert the rod into the rod and rotation control center rod, suck the sandy soil with the suction tube, insert the inner tube into the ground, and lower the lower end of the inner tube containing the sample to the refrigerant injection tube and the heat insulating tube to eliminate the influence on the surroundings This is a sampling method using suction boring that is blocked with frozen soil by the refrigerant injected by the soil, so it is possible to easily collect undisturbed samples necessary for examining the mechanical properties such as strength and deformation of the ground, or the soil contamination status. Yes, and because of suction boring, there is almost no impact on the ground. Furthermore, it is possible to collect regardless of whether it is a weak sandy soil layer (alluvium) or a hard sandy soil layer (Hongdae layer). Furthermore, since the sampling diameter is the same as that of the test specimen, the shaping time can be shortened.
[0028]
Further, the present invention is a sampling device by suction type boring in sandy ground , and is arranged between an outer tube , an inner tube for containing a sample, and an outer tube and an inner tube to suck sandy soil. The suction pipe, the handle for rotating the suction pipe, and sandy soil are sucked from the suction pipe, and the outer pipe and the suction pipe fixed to the outer pipe are rotated to dig while sandy soil is sucked and accommodated in the inner pipe. A refrigerant injection tube that partially closes the lower bottom of the sample and a heat insulating tube that eliminates the influence on the surroundings are installed. The handle is fixed to the upper end of the rod / rotation control center rod for the outer tube, the upper opening of the inner tube is closed with a lid plate, the rod / rotation control center rod is erected at the center of the lid plate, and the inner tube is placed inside the outer tube. The rod / rotation control center rod is also used as the outer tube rod. Since the sampling apparatus by the suction-type boring inserted into rolling control center in rods can be easily taken undisturbed sample necessary to examine mechanical properties such as strength and deformation of the ground, or ground pollution, In addition, the suction boring has little impact on the ground. Furthermore, it is possible to collect regardless of whether it is a weak sandy soil layer (alluvium) or a hard sandy soil layer (Hongdae layer). Furthermore, since the sampling diameter is the same as that of the test specimen, the shaping time can be shortened.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall outline of the present invention.
FIG. 2 is a top plan view of an outer tube according to the present invention.
FIG. 3 is a detailed view of a main part of a lower end of a sampling device by suction boring according to the present invention.
FIG. 4 is a perspective view showing an overall outline of a tip clogging mechanism in the case of sand having a low water content ratio according to the present invention.
FIG. 5 is a detailed view of a main part of FIG. 4;
FIG. 6 is a perspective view showing the overall outline of the tip clogging mechanism in the case of the sand of the present invention when saturated and with a high water content ratio.
7 is a two-side view of a main part of FIG. 6 with a perspective view and a bottom view.
FIG. 8 is a two-side view of a main part perspective view and a bottom view showing a process of closing a sample tip.
FIGS. 9A and 9B are a perspective view and a bottom view of the main part showing a state in which the tip of the sample is closed. FIGS.
[Explanation of symbols]
1 ... Outer tube 2 ... Inner tube 3 ... Suction tube

Claims (2)

A sampling method using suction-type boring in sandy ground , an outer tube, an inner tube that contains a sample, a suction tube that is disposed between the outer tube and the inner tube, and sucks sandy soil, and a suction tube The lower part of the lower end of the sample housed in the inner pipe is a part of the outer pipe and the suction pipe that is fixed to the outer pipe. Equipped with a refrigerant injection pipe that closes and a heat insulation pipe that eliminates the influence on its surroundings, the upper opening of the outer pipe is closed with a lid plate, and an outer tube rod and rotation control center rod is erected at the center of the lid plate, A handle is fixed to the upper end of the rotation control center rod, the upper opening of the inner tube is closed with a cover plate, the rod / rotation control center rod is erected at the center of the cover plate, and the inner tube is provided with a predetermined gap in the outer tube. Fit the rod and rotation control center rod into the outer tube rod and rotation control center rod The sand pipe is sucked in with a suction pipe, the inner pipe is inserted into the ground, and the lower part of the lower end of the inner pipe containing the sample is frozen by the refrigerant injected pipe and the refrigerant injected by the heat insulating pipe that eliminates the influence on the surroundings. Sampling method by suction type boring that closes at the bottom. A sampling device by suction type boring in sandy ground, an outer tube, an inner tube for storing a sample, a suction tube arranged between the outer tube and the inner tube to suck sandy soil, and a suction tube The lower part of the lower end of the sample housed in the inner pipe is a part of the outer pipe and the suction pipe fixed to the outer pipe and the suction pipe fixed to the outer pipe. Equipped with a refrigerant injection pipe that closes and a heat insulation pipe that eliminates the influence on its surroundings, the upper opening of the outer pipe is closed with a lid plate, and an outer tube rod and rotation control center rod is erected at the center of the lid plate, A handle is fixed to the upper end of the rotation control center rod, the upper opening of the inner tube is closed with a cover plate, the rod / rotation control center rod is erected at the center of the cover plate, and the inner tube is provided with a predetermined gap in the outer tube. Fit the rod and rotation control center rod inside the outer tube rod and rotation control center rod Inserted suction type boring by the sampling device.

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