JPS5921888A - Extracting method from boring hole of flexible thin-film tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (I) Background Technical Field of the Invention The present invention involves inserting a flexible transparent thin film tube into a poling hole, and injecting clean water into the tube to expand the tube. Removal of a flexible thin film tube from a borehole, which is suitably employed in a method of replacing polluted water with fresh water and inserting a borehole television camera or borehole video camera into the tube to observe the wall surface of the polling hole. Regarding the one-sided method.

Prior art and its problems As shown in Fig. 1, a polling hole observation device 2 equipped with a borehole television camera, lighting, a reflector, etc. in a transparent cylinder is inserted into a polling hole 1 using a wind-F machine 3. A method for observing the wall surface of a polling hole 1 has been proposed, in which the hole wall surface 6 of the polling hole 1 is photographed and recorded on a monitor television 4 and a video tape recorder 5 on the ground, and successful examples thereof have been reported.

According to those reports, imaging of the hole wall surface is possible only when groundwater is sucked underground and accumulates in the poling hole, or when the water that accumulates in the poling hole has extremely high transparency. If the water in the polling hole is turbid, the image will be unclear, and if the degree of turbidity becomes high, it will be completely impossible to photograph the hole wall. Pore water contamination is caused by the dissolution of slime (boring debris) and the hole wall, as well as polling wastewater such as bentonite and plaster used during drilling. In this case, a sufficient effect cannot be obtained in removing contamination of borehole water. Therefore, it has been desired to develop a technology that completely removes contamination from the borehole water.

In view of the above circumstances, the inventor's related group,
Having developed a method for replacing polluted water inside a hole with fresh water as shown in Figure 2, the present inventor has developed a method for taking out a flexible tube from a poling hole as a related technology for effectively implementing the method for replacing polluted water inside a hole with fresh water. It was devised.

To briefly explain the method of replacing polluted water in a hole with fresh water as shown in FIG. 2, first, as shown in FIG. m to 300fi) small hole 7a
, 7a, ... clear drainage hose (e.g. outer diameter 10m)
) 7 and a flexible transparent thin film tube 8 whose insertion tips are closed and crushed without being expanded so that no air remains inside are inserted using weights 9 and 10, respectively, and then, as shown in FIG. 2 (I)). As shown in the figure, fresh water is injected from the ground into the flexible transparent membrane tube 8, and the tube 8 is expanded from the top to the bottom by hydrostatic pressure, and the polluted water in the hole is accordingly removed. This method is to discharge water to the ground through a drainage hose 7. As shown in FIG. 2(C), if the borehole television camera 2 is inserted into the flexible transparent thin film tube 8 expanded by fresh water injection, the tube 8 will be in close contact with the hole wall surface, so that the tube 8 will be in close contact with the hole wall surface. It can be observed clearly. In addition, the polling hole 1 is prepared by pumping fresh water in advance to remove bentonite and the like adhering to the hole wall surface.
Furthermore, use a dummy of the hole wall observation device to check whether the dummy can be inserted to the bottom of the polling hole.

However, after observing the hole wall surface, a method for removing the flexible tube that is in close contact with the hole wall surface all around from the poling hole is also required. In other words, regarding a flexible thin film tube that is inserted to the bottom G of a polling hole and expands due to hydrostatic pressure when fresh water is injected into the tube from the ground, and is in close contact with the wall surface of the polling hole all around, To take out the
The adhesion force between the tube and the hole wall increases in proportion to the hydrostatic pressure as it gets deeper into the ground.For example, it reaches 20 atm at a depth of 200m. Therefore, if the bottom of the flexible thin film tube is pierced and the tube is placed above ground. Even if consideration is given so that the fresh water in the tube leaks to the bottom of the polling hole and moves to the bottom of the polling hole, it is not possible to grasp the upper end of the tube and pull it up. This is because the adhesion force of the tube to the wall of the hole is large, and if the tube is pulled up on the ground, the thin film tube will stretch and break. In addition, to catch a hook or the like, attach a metal fitting to one end of the rope and insert it into the polling hole, and if you try to hook the thin film tube at the top, middle, or bottom and retrieve it to the ground, the thin film tube will tear and fall to the ground. is impossible to recover.

(II) Purpose of the Invention The present invention has been devised in view of the above-mentioned points, and a liquid having a specific gravity higher than that of the liquid in the tube is injected into the lower side of the flexible thin film tube inserted into the polling hole. A flexible thin-film tube that allows the flexible thin-film tube to be easily recovered to the ground without requiring human hands or by simply pulling the above-ground end of the flexible thin-film tube with a small force. This provides a method for taking out the material from the polling hole.

According to the present invention, this object is inserted into a polling hole having polluted water inside the hole, and the lower end is closed like a bag, and the liquid is stored inside and expands to tightly adhere to the wall surface of the polling hole all around. Through a liquid feed pipe inserted below the flexible thin film tube from the ground to a deeper position than the flexible thin film tube, the liquid is delivered to the bottom of the poling hole with a specific gravity higher than that of the liquid in the flexible thin film tube. This is achieved by a method of removing a flexible thin film tube from a poling hole, which is characterized by injecting a large amount of liquid.

This method includes a method in which the liquid feed pipe is inserted after observing the hole wall surface, and a method in which the liquid feed pipe is inserted in advance when inserting the flexible thin film tube, as shown in the following two embodiments. .

That is, the liquid feed pipe is made of metal and is inserted inside the flexible thin film tube, and the insertion tip thereof pierces the bag-shaped end of the flexible thin film tube, which is the insertion tip, and enters the polling hole. An embodiment in which the liquid with a high specific gravity is injected into the bottom part, and the liquid feeding pipe is a flexible pipe, and the flexible thin film tube is injected into the flexible thin film tube in advance before the flexible thin film tube is inserted into the polling hole. This is an embodiment in which the poling hole is inserted between the hole wall surface of the polling hole.

According to the method of taking out a flexible thin film tube from a polling hole of the present invention, the flexible thin film tube, which is in close contact with the wall surface of the polling hole all around due to hydrostatic pressure, is passed through the liquid feed pipe. It simply sends a thick slurry-like liquid such as bentonite, which has a higher specific gravity than the liquid in the flexible thin film tube (fresh water lid specific gravity l), to the bottom of the poling hole, and this makes the liquid with high specific gravity flexible. Some liquid enters between the thin film tube and the hole wall, and as the flexible thin film tube deflates, the liquid inside the tube overflows to the ground, and the adhesion of the flexible thin film tube to the hole wall is lost. Due to the large liquid feeding pressure and the difference in specific gravity between the inside and outside of the tube, the buoyancy of the flexible tube increases according to the amount of liquid fed in, and since the tube is a weight for insertion, the buoyancy of the flexible tube increases even if the buoyancy does not increase. This allows the tube to be pulled up very easily.

The liquid sent to the bottom of the polling hole through the liquid feed pipe should have a higher specific gravity than the liquid in the tube (fresh water is used; specific gravity: 1), but later the polling hole should be dug deeper again to observe the hole wall surface. It is preferable to use a liquid in the form of highly concentrated muddy water, such as bentonite or plaster, as a liquid that does not cause any adverse effects during the process and can break the tight contact between the flexible thin film tube and the hole wall surface.

The flexible thin film tube that can be taken out from the polling hole according to the present invention is a tube that is inserted into the polling hole that has polluted water inside the hole, and the insertion tip, that is, the lower end, is closed like a bag, and the liquid inside is closed. The object is a tube that is filled, expands due to hydrostatic pressure, and is in close contact with the hole wall all around.

If the lower end of the tube is not closed, even if a liquid with a higher specific gravity than the liquid inside the tube is sent to the bottom of the poling hole through the liquid feed pipe, the liquid will enter the tube and rise up the liquid boundary surface, causing the liquid inside the tube to flow. This is because (clean water) is pushed up and there is no space between the tube and the hole wall, and therefore no buoyancy is created in the tube, making it impossible to recover it to the ground.

As an embodiment of the present invention, after observing the hole wall surface, a liquid feeding pipe is inserted into the polling hole, and the pipe penetrates the bottom of the flexible thin film tube to send a liquid having a specific gravity of more than 1 to the bottom of the polling hole. It is necessary to ensure that the lower end of the closed tube remains in close contact with the outer periphery of the liquid inlet pipe almost all the way around the outer circumference of the liquid inlet pipe even after the tube is pierced. If the tube is opened with a large gap, it will be impossible to recover the tube, so it is preferable to take appropriate measures to extend the life of the tube so that the piercing can be performed satisfactorily. For example, it is preferable that the insertion tip of a pipe for taking out a tube has a shape in which a blade is formed at the end that is cut perpendicular to the pipe axis, and a blade like a hypodermic needle may deviate from the polling hole during insertion of the pipe. This is undesirable as there is a risk of it digging into the ground.

As in the method of replacing polluted water in the hole with clean water shown in Fig. 2, the flexible thin film tube and the hole wall surface of the poling hole are sandwiched at an appropriate pitch, for example, 200 mvb L 3 Q Q
If a drain hose with small holes at a Nib pitch is inserted in advance, it is preferable to send only a small amount of liquid with a large specific gravity through the drain hose. This is because the high specific gravity liquid enters between the tube and the hole wall surface from the small hole located close to the ground level of the drain. If there is a drain hose,
A part of the liquid with a high specific gravity fed into the bottom of the polling hole through the liquid feeding valve rises inside the hose from the lower end of the drain hose, flows out again from the small hole above, and comes into close contact with each other. The space serves to fit between the tube and the hole wall.

Therefore, the drainage hose is not only necessary for the method of replacing polluted water in the hole with fresh water, but also plays a useful role in the present invention.

When inserting the flexible thin film tube into the polling hole,
In order to prevent the tube from being twisted and inserted, as shown in FIG. When the flexible thin film tube 8 is connected and inserted into the polling hole 1, it is necessary to take out the drain hose in parallel with taking out the tube from the polling hole.

In the above case, if the connection between the flexible thin film tube and the drain hose is pressed and broken with the insertion tip of the liquid feed pipe, the flexible thin film tube can be removed independently of the drain hose. You can do it by doing this. For this purpose, it is best to tie the tube and tube guide together with a weak thread.

According to the present invention, the flexible thin film tube is taken out by adding buoyancy to the tube, or if the weight for inserting the tube is heavy, the tube will not float naturally, but the operator can take out the liquid by feeding it through the nozzle. The tube can be recovered by pulling it up in accordance with the rise of the boundary surface of the liquid being fed.

A weight (this is filled with sand packed in a tube or packed in a plastic film bag tied to the bottom end of the tube, pierced by a liquid feed pipe and shifted so that the sand falls to the bottom of the polling hole) This is preferable because the buoyancy of the tube is increased well, and when the poling hole is dug down again, the weight does not drop to the bottom of the poling hole and interfere with the digging.

In particular, after observing the hole wall surface, a metal liquid feed pipe is inserted into the poling hole. Collect the tube away from the tube.

Further, as another embodiment of the present invention, when the liquid feed pipe is inserted in advance so as to be positioned between the flexible thin film tube and the hole wall surface when the flexible thin film tube is inserted into the poling hole, the hole wall surface To recover the tube to the ground after observation, it is only necessary to feed a liquid with a higher specific gravity than the liquid inside the tube into the liquid feed pipe, and at this time,
When the pipe and the tube are engaged through a tube guide, it is necessary to simultaneously lower the pipe to the ground by the same size as the recovery size of the tube.

According to this embodiment, in addition to inserting the drain hose into the polling hole, the liquid feed pipe is also inserted, and the diameter of the polling hole is 100 mm to 3 mm.
When it is about 00 words, it is necessary to insert the drain hose and liquid feed pipe together as one in order to insert the flexible thin film tube without twisting it. However, according to the present invention, the invention is directed to a method for taking out a tube and not a method for inserting a tube, so a liquid feeding pipe is sufficient. Drainage hoses cannot double as liquid delivery pipes. The reason for this is that the drainage hose has small holes at a pitch of 200U to 300m, so even if you try to send liquid to the bottom of the polling hole through the drainage hose, it will flow out from the small holes close to the ground and become flexible. This is because it is impossible to recover the thin film tube by simply deflating the portion of the thin film tube close to the ground. However, it is preferable to send a liquid with a specific gravity slightly higher than that of soil into the drain hose, since this effectively serves to break the tight contact between the flexible thin film tube in the shallow part of the polling hole and the hole wall surface. Therefore, the liquid feed pipe is extruded from urethane material as a hose with two passages, and the - passage is used as the liquid feed pipe, and the other passages are used as drainage hoses by making small holes at appropriate pitches. It is preferable to do so. Note that the present invention does not particularly limit the diameter and depth of the poling hole.

(nT) Specific Example of the Invention Now, as shown in FIG. 4(a), a drain hose 7 and a flexible thin film tube 8 are inserted into the polling hole 1.
Fresh water is injected from the ground into the flexible thin film tube 8, which expands due to hydrostatic pressure and is in close contact with the hole wall surface 6 of the polling hole.A tube guide 1] is fitted and engaged with the drain hose 7, and It is assumed that the tube 8 is tied to the tube guide 11 with a weak thread. Note that 9 and 10 are weights.

To recover the flexible thin film tube 8 in the above state to the ground, a metal liquid feed pipe 12 is installed directly above the polling hole 1 using a pipe sending and lifting device 13, and the pipe is added to the polling hole 1. Insert it into. Then, as shown in FIG. 4), the insertion tip of the liquid feed pipe 12 pierces the closed lower end of the flexible thin film tube 8 and breaks the binding between the tube 8 and the tube guide 11. A muddy viscous solution of bentonite having a specific gravity of more than 1 is sent from above the ground to the bottom of the polling hole 1 through a liquid sending pipe 12. Then, as shown in FIG. 4(C), the bentonite solution enters between the flexible thin film tube 8 and the hole wall surface 6, which are in close contact with each other, and contracts the tube 8. As the tube 8 contracts, the fresh water inside the tube overflows to the ground. As shown in FIG. 4(d), the drainage hose 7 is hoisted to the ground and recovered by the hoisting machine 14 at an early stage.

The flexible thin film tube 8 is compressed from the lower end to the upper end by the collection of the drain hose 7, and the bentonite solution with a high specific gravity sent to the bottom of the polling hole 1 is also compressed to a level quite close to the ground level. The tube enters between the tube 8 and the hole wall surface 6 and rises. Therefore, the drain hose 7
The recovery of the tube 8 is adjusted to the amount of liquid fed in.If a liquid having a large specific gravity is fed into the tube 8, the tube 8 becomes in a floating state and is pushed up. Then, as shown in FIG. 4(e), the tube 8 can be recovered to the ground by continuously cutting open the extraction point on the ground with the knife 15 and pulling it up away from the liquid feed pipe 12. After the tube 8 can be pulled up, the liquid feeding through the liquid feeding pipe 12 is unnecessary and is stopped. After the tube 8 is recovered, the liquid feed pipe 12 may finally be recovered to the ground by the pipe delivery and lifting device 13.

(IV) Specific effects of the invention As explained above, the method for taking out the flexible thin film tube of the present invention from the polling hole is to close the insertion tip of the tube and insert it into the polling hole. , the tube, which is filled with fresh water and is in close contact with the hole wall all around, is inserted into the bottom of the tube either through a flexible liquid feed pipe inserted between the tube and the hole wall in advance, or by inserting it into the polling hole after observing the hole wall. In this method, a liquid such as bentonite solution, which has a higher specific gravity than the liquid (fresh water) inside the tube, is sent to the bottom of the poling hole through a metal liquid sending pipe that pierces through the tube. therefore,
The pumped liquid enters between the chicobe and the hole wall and the buoyancy of the tube acts on the tube, so no matter how large or small the diameter of the poling hole is or how deep it is, the flexible thin film remains. The tube can be naturally pushed to the ground as a liquid such as bentonite solution is sent, and if necessary, the tube can be easily and reliably removed to the ground by having a worker pull it up. .

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a polling hole during observation work, showing a conventional method for observing the wall surface of a polling hole, and Figures 2 (a) (b)
) (c) is an explanatory process diagram of a newly developed method for replacing polluted water in a hole with fresh water, in which the method of taking out the flexible thin film tube from the polling hole of the present invention is suitable, and FIG. 3 is similar to FIG. 4A and 4B are cross-sectional views of a polling hole illustrating a method of inserting a flexible thin film tube into the polling hole, which is employed to carry out the method of replacing polluted water in the hole with fresh water.
)t) (d) and (e) are process diagrams for explaining the method of taking out the flexible thin film tube of the present invention from the borehole. 1...Poling hole, 8...Flexible thin film tube,
12...Liquid feed pipe. Figure 2 -1111------

Claims (1)

[Scope of Claims] ■ It is inserted into a polling hole that has polluted water inside the hole, and the lower end is closed like a bag, and the liquid is accommodated inside and expands and is in close contact with the wall surface of the polling hole all around. A liquid having a specific gravity higher than that of the liquid in the flexible thin film tube is supplied to the bottom of the polling hole through a liquid feed pipe inserted below the flexible thin film tube to a position deeper than the flexible thin film tube from the ground. A method for taking out a flexible thin film tube from a poling hole, the method comprising injecting a liquid. 2. The liquid feed pipe is made of a metal pipe, and is inserted inside the flexible thin film tube, and its insertion tip pierces the bag-like end of the flexible thin film tube, so that the liquid feed pipe has the specific gravity at the bottom of the polling hole. A method for taking out a flexible thin film tube from a poling hole according to claim 1, in which a large amount of liquid is injected. 3. The liquid feeding pipe is a flexible pipe and is inserted between the flexible thin film tube and the wall surface of the polling hole in advance of the insertion of the flexible thin film tube into the polling hole. A method for removing a flexible thin film tube from a poling hole according to item 1.