JP2004011139A - Probe detention preventive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a probe detention preventive device capable of taking in a breakdown material and effectively preventing the detention of a probe. <P>SOLUTION: A cover 11 has a through hole and the upper end of a probe 30 can be covered. A lifting cable 31 attachable to the probe 30 can be inserted in the through hole. A inner cylindrical body 12 is deformed by a pressure of a breakdown material 42 caught between the wall 41 of a boring hole and the cylindrical body 13 and has a restorable elasticity by removing the pressure. The outer cylinder 13 has an opening at the upper end, the inner cylinder 12 is supported in the inside and the lower end is provided on the upper side of the cover 11. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a probe restraint prevention device for preventing restraint of a probe suspended in a borehole.
[0002]
[Prior art]
When performing measurement work such as logging in a borehole using a probe, the hole wall above the probe collapses, and the collapsed substance is caught between the probe and the hole wall, so that the probe is retained in the hole. An accident that would have been done had occurred. When such a probe detainment accident occurs, a method is employed in which the probe is raised and lowered in small increments to drop a collapsed substance downward from between the probe and the hole wall. However, it often takes time to remove the disintegration by this method, and there has been no effective probe recovery method. Therefore, in the worst case, the probe may not be able to be collected.
[0003]
As a conventional probe detainment prevention device for preventing such a probe detainment accident, for example, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 5-33575. That is, an arm expanding device is attached to the probe, and the probe is pressed against the hole wall surface by expanding the arm. The arm is narrowed by pulling up the cable. In addition, the linear guides are erected radially at the upper end of the probe so that pebbles of a size that cause problems when caught between the probe body and the hole wall are dropped into the probe cap receptacle at the upper end of the probe. The probe is dropped so as to prevent the probe from being caught between the probe and the hole wall.
[0004]
[Problems to be solved by the invention]
However, the conventional probe restraint prevention device has a narrow gap between the receptacles for pebbles and the like, and has a very small capacity. There is a problem that the probe cannot be pulled out of the hole due to the accumulation of small particles on the surface or the pebbles being caught between the probe and the hole wall.
The present invention has been made in view of such a conventional problem, and has as its object to provide a probe restraint prevention device capable of effectively capturing restraint of a probe by incorporating a collapsed substance therein. .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a probe restraint prevention device according to a first aspect of the present invention is a probe restraint prevention device for preventing a probe hung in a borehole from being restrained by collapsing material of a hole wall. A cover having a through hole through which a lifting cable attached to the probe can be inserted, and covering the upper end of the probe; an inner cylinder having a guide hole into which the lifting cable can be inserted; It has an elasticity that can be deformed by the pressure of the collapsible material sandwiched between the walls and can be restored by removing the pressure, has an opening at the upper end, supports the inner cylinder inside, and has a lower end above the cover And a provided outer cylinder.
[0006]
In the probe restraint prevention device according to the first aspect of the present invention, the cover may have any shape such as a hemispherical shape or a tapered shape. The inner cylinder preferably has an inner diameter large enough to allow a cable for raising and lowering the probe to penetrate smoothly. The outer cylinder is made of, for example, soft plastic, rubber, spring steel, or the like. The outer cylinder has an outer diameter equal to or larger than the outer diameter of the probe and equal to or smaller than the boring hole diameter. By making the outer diameter close to the boring hole diameter, a function of a centralizer can be provided. The opening of the outer cylinder is preferably large in order to make it easy to take in a collapsed material.
[0007]
In use, the probe restraint prevention device according to the first aspect of the present invention inserts a cable for raising and lowering the probe into the through hole of the cover and the guide hole of the inner cylinder so as to cover the upper end of the probe. The probe detention prevention device is inserted into the borehole together with the probe to perform operations such as measurement. Most of the collapsed material that has fallen from the hole wall during or after the work is taken into the inside of the outer cylinder through the opening at the upper end of the outer cylinder. For this reason, it is possible to prevent the disintegration substance from being interposed between the probe and the hole wall and restraining the probe. When a collapsible material is caught between the outer cylinder and the hole wall, the outer cylinder is deformed so as to be dented by its elasticity, and the collapsible material is kept from falling toward the probe. Thereby, it is possible to prevent the collapsible substance from being caught between the probe and the hole wall, thereby preventing the probe from being restrained.
[0008]
A probe retention device according to a second aspect of the present invention is the first probe retention device according to the first probe retention device, wherein the outer cylinder comprises an upper outer cylinder and a lower outer cylinder, and the upper outer cylinder surrounds a collapsible material inside. It has a window that can be taken in, and the lower outer cylinder is characterized in that the lower end is fixed to the outer periphery of the cover so that a collapsible substance can be accommodated inside. Note that the windows are preferably arranged in a plurality of steps in a staggered lattice shape.
[0009]
In the probe retaining device according to the second aspect of the present invention, a part of the collapsible material dropped between the outer cylinder and the hole wall is taken into the outer cylinder through the window. For this reason, it is possible to prevent the probe from being restrained by a collapsed substance being sandwiched between the probe and the hole wall. When a collapsed object is caught between the outer cylinder and the hole wall, the lifting cable is pulled up. When the outer cylinder is deformed and the collapsible material reaches the position of the window, the collapsible material is introduced into the outer cylinder from the window. Thereby, it is possible to prevent the collapsible substance from being caught between the probe and the hole wall, thereby preventing the probe from being restrained.
[0010]
A probe retention device according to a third aspect of the present invention is the second probe retention device according to the second probe retention device, wherein the inner cylinder or the outer cylinder has an engaging portion for lifting, and the lower outer cylinder or the cover is water-permeable. It is characterized by having holes.
[0011]
In the probe restraint prevention device according to the third aspect of the present invention, a wire rope or the like can be hooked on the engaging portion for lifting, separated from the probe, and lifted to the ground. For this reason, when collapsible material accumulates inside the outer cylinder, the collapsible material can be removed by lifting. After removing the collapsible material from the outer cylinder, it can be lowered again to the top of the probe and the operation can be continued. Thus, the operation such as measurement can be continued without raising the probe to the ground. Also, when placing the probe in the groundwater in the borehole, the groundwater enters the outer cylinder through the water-permeable hole, preventing the outer cylinder from floating due to buoyancy by air and allowing smooth insertion into the hole. . Further, when pulling up the probe, water accumulated inside the outer cylinder can be drained out of the water permeable hole, and the load on the pulling device can be reduced.
[0012]
A probe retention device according to a fourth aspect of the present invention is the probe retention device according to the second or third aspect, wherein the lower end of the upper outer cylinder is detachably attached to the upper end of the lower outer cylinder, and the inner cylinder is The lower outer cylinder and the cover are supported by the upper end of the upper outer cylinder and extend to the inside of the through hole, and the lower outer cylinder and the cover are provided to be openable and closable so as to open the through hole, and the inner cylinder opens the guide hole. It is characterized by being provided so that it can be opened and closed.
[0013]
In the probe restraint prevention device according to the fourth aspect of the present invention, when installing the lifting cable of the probe in the through hole of the cover and the guide hole of the inner cylinder, first remove the lower outer cylinder from the upper outer cylinder. The lifting cable is inserted into the upper outer cylinder, the inner cylinder is opened, the lifting cable is inserted into the opened guide hole from a direction perpendicular to the length direction, and the inner cylinder is closed. Further, the lower outer cylinder and the cover are opened, the lifting cable is inserted into the opened through hole from a direction perpendicular to the length direction, and the lower outer cylinder and the cover are closed. After the lifting cable is inserted into the through hole and the guide hole, the lower end of the inner cylinder is inserted into the through hole, and the lower end of the upper outer cylinder is attached to the upper end of the lower outer cylinder. This makes it easy to pass the lifting cable through and through the through hole of the cover and the guide hole of the inner cylinder. When removing the lifting cable from the through hole and the guide hole, the operation may be performed in the reverse order.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of the present invention.
As shown in FIGS. 1 and 2, the probe restraint prevention device 10 has a cover 11, an inner cylinder 12, an outer cylinder 13, and a support member 14. The probe restraining prevention device 10 is a device for preventing the probe 30 suspended in the boring hole 40 from being restrained by the collapsed material 42 of the hole wall 41 as shown in FIG. The probe 30 is hung with the lifting cable 31 attached to the upper end.
[0015]
The cover 11 has a hemispherical shape according to the shape of the upper end of the probe 30, and can cover the upper end of the probe 30. A through hole 15 is provided at the center of the cover 11 so that the lifting cable 31 can be inserted. The inner cylinder 12 has an elongated cylindrical shape, and has a guide hole 16 into which the elevating cable 31 can be inserted. The guide hole 16 has a diameter corresponding to the diameter of the lifting cable 31 so that the lifting cable 31 is inserted and guided. The inner cylinder 12 has an engaging portion 12a for lifting at the upper end.
[0016]
The outer cylinder 13 is cylindrical and has an opening 13a at the upper end. The outer cylinder 13 has an outer diameter equal to or larger than the outer diameter of the probe 30 and equal to or smaller than the hole diameter of the boring hole 40. The outer cylinder 13 can have a function of a centralizer by making the outer diameter close to the hole diameter of the boring hole 40. The outer cylinder 13 is made of spring steel, and has elasticity that can be deformed by the pressure of the collapsible material 42 sandwiched between the outer cylinder 13 and the hole wall of the boring hole 40 and can be restored by removing the pressure. The upper end portion 17 of the outer cylinder 13 has a shape that is tapered toward the opening 13a so that the edge is less likely to be caught by the hole wall 41 when the probe 30 is raised. The lower end of the outer cylinder 13 is attached to the outer periphery of the cover 11, and the outer cylinder 13 is provided above the cover 11.
[0017]
A plurality of windows 18 are provided around an upper side surface 19 of about 1/3 of the upper side of the outer cylinder 13 for taking in the collapsed material into the outer cylinder 13. There is no window on the lower side surface 20 of about 2/3 of the lower side of the outer cylinder 13, and the collapsible material 42 can be stored on the cover 11. A plurality of water-permeable holes (not shown) are provided in the lower side surface 20 of the outer cylinder 13.
[0018]
The windows 18 have the same size, and are arranged in a staggered pattern on the outer cylinder 13. That is, the windows 18 are arranged at equal intervals in the circumferential direction of the outer cylinder 13 and are provided with a plurality of steps in the length direction. The windows 18 of each stage are displaced from the windows 18 of the adjacent upper and lower stages, and are arranged at equal intervals every other stage in the length direction of the outer cylinder 13. The outer cylinder 13 has the inner cylinder 12 disposed inside such that the center line of the inner cylinder 12 and the center line of the outer cylinder 13 coincide with each other, and the lower and upper parts of the inner cylinder 12 are supported by a support member 14. The inner cylinder 12 is slightly longer than the outer cylinder 13, and the upper end of the inner cylinder 12 is higher than the upper end 17 of the outer cylinder 13. The support member 14 is, for example, composed of a set of three. The support member 14 supports the inner cylinder 12 slightly upward from three directions from the outer cylinder 13 toward the inner cylinder 12.
[0019]
Next, the operation will be described.
As shown in FIG. 1, when used, the probe restraint prevention device 10 inserts the lifting cable 31 of the probe 30 into the through hole 15 of the cover 11 and the guide hole 16 of the inner cylinder 12, and attaches the cover 11 to the probe 30. Install to cover the top. In this state, the probe restraint prevention device 10 is inserted into the borehole 40 together with the probe 30 to perform work such as measurement at an arbitrary depth. Most of the collapsible material 42 dropped from the boring hole wall 41 above the probe 30 during or after the work is taken into the inside of the outer cylinder 13 through the opening 13 a at the upper end of the outer cylinder 13 of the probe restraint prevention device 10. For this reason, it is possible to prevent the collapse of the probe 30 due to the debris 42 such as pebbles being sandwiched between the probe 30 and the hole wall 41.
[0020]
When a collapsible material 42 such as pebbles is caught between the outer cylinder 13 and the hole wall 41, as shown in FIG. 3A, the outer cylinder 13 is deformed so as to be dented by its elasticity, and the collapsible material 42 To keep it from falling. Thereby, the collapsible substance 42 can be prevented from being caught between the probe 30 and the hole wall 41, and the probe 30 can be prevented from being restrained. In addition, a part of the collapsed material 42 that has fallen between the outer cylinder 13 and the hole wall 41 is taken into the outer cylinder 13 through the window 18. For this reason, it is possible to prevent the probe 30 from being restrained by the debris 42 being sandwiched between the probe 30 and the hole wall 41.
[0021]
However, when the collapsed object 42 is still sandwiched between the outer cylinder 13 and the hole wall 41, the lifting cable 31 is slightly forcibly pulled up. When the outer cylinder 13 is deformed and the collapsible material 42 reaches the position of the window 18, the collapsible material 42 is introduced into the outer cylinder 30 from the window 18, as shown in FIG. Since the windows 18 are arranged in a staggered lattice pattern, when the probe 30 is pulled up, the collapsible material 42 is taken in from any of the windows 18 in a plurality of stages. Thereby, the collapsible substance 42 can be prevented from being caught between the probe 30 and the hole wall 41, and the probe 30 can be prevented from being restrained. When the collapsible material 42 is removed, the deformed outer cylinder 13 is restored to its original state by its elasticity.
[0022]
When the debris 42 accumulates inside the outer cylinder 13, the logging is stopped once, and a thin wire rope provided with a hooking member at the tip is lowered into the hole. The hook member of the wire rope is hooked on the engaging portion 12a for lifting, and only the probe restraint prevention device 10 can be separated from the probe and pulled up to the ground. After removing the collapsible material 42 from the outer cylinder 13 on the ground, the work can be continued by lowering the probe 30 to the position above the probe 30 again. Thus, the operation such as measurement can be continued without raising the probe 30 to the ground.
[0023]
Further, when the probe 30 is put into the underground water in the borehole 40, the groundwater enters the outer cylinder 13 from the water permeation hole, so that the outer cylinder 13 is prevented from floating by air buoyancy, and is smoothly inserted into the hole. can do. Further, when the probe 30 is pulled up, the water accumulated inside the outer tube 13 can be drained out of the water permeable hole, and the load on the pulling device can be reduced. In addition, the fine-grained collapsible material 42 having a size that is not sandwiched between the probe 30 and the hole wall 41 can be discharged from the inside of the outer cylinder 13 through the plurality of water-permeable holes. For this reason, the inside of the outer cylinder 13 can be used efficiently.
[0024]
In addition, as shown in FIG. 4, the outer cylinder 13 preferably includes a cylindrical upper outer cylinder 21 and a lower outer cylinder 22. The upper outer cylinder 21 has an opening 13a at the upper end, and has a plurality of windows 18 around it. The upper outer cylinder 21 has a lower end inserted into an upper end of the lower outer cylinder 22 and is detachably attached thereto. The lower outer cylinder 22 has a lower end attached to the outer periphery of the cover 11 and is provided above the cover 11. The lower outer cylinder 22 is capable of accommodating the collapsed material 42 inside. Although the lower end of the lower outer cylinder 22 is closed by the cover 11, the lower end may be further closed.
[0025]
Further, the inner cylinder 12 may be composed of a main body 12a and a lid 12b as shown in FIG. In this case, the main body 12a has a groove extending in the length direction and reaching both ends, and the lid 12b is detachably attached to the main body 12a so as to close the groove. Thus, the inner cylinder 12 can be opened and closed by the lid 12b so as to open the guide hole 16. Further, as shown in FIG. 5B, it is preferable that the cover 11 and the lower outer cylinder 22 can be opened and closed so as to open the through hole 15.
[0026]
In the case of the configuration shown in FIGS. 4 and 5, when installing the lifting cable 31 of the probe 30 in the through hole 15 of the cover 11 and the guide hole 16 of the inner cylinder 12, first, the lower outer cylinder 22 is connected to the upper outer cylinder. Remove from 21. The elevating cable 31 is inserted into the upper outer cylinder 21, the lid 12b of the inner cylinder 22 is opened, and the elevating cable 31 is inserted into the opened guide hole 16 in a direction perpendicular to the length direction. Close 12. Further, the lower outer cylinder 22 and the cover 11 are opened, the lifting cable 31 is inserted into the opened through hole 15 from a direction perpendicular to the length direction, and the lower outer cylinder 22 and the cover 11 are closed. When the lifting cable 31 is inserted into the through hole 15 and the guide hole 16, the lower end of the inner cylinder 12 is inserted into the through hole 15, and the lower end of the upper outer cylinder 21 is attached to the upper end of the lower outer cylinder 22. This makes it easy to pass the lifting cable 31 through and out of the through hole 15 of the cover 11 and the guide hole 16 of the inner cylinder 12. When removing the lifting cable 31 from the through hole 15 and the guide hole 16, the operation may be performed in the reverse order.
[0027]
As described above, in the probe detention device 10, most of the collapsible material 42 that has fallen from the hole wall 41 when the probe 30 is pulled up during or after the measurement operation in the boring hole is outside the probe detention device 10. Since it enters the inside of the outer tube 13 from the opening 13a at the upper end of the tube 13, it is possible to prevent the pebble or the like from being interposed between the probe 30 and the hole wall 41 to restrain the probe 30. Pebbles and the like, which are interposed between the outer cylinder 13 of the probe detention prevention device 10 and the hole wall 41, of the collapsible matter 42 enter the interior of the outer cylinder 13 through the window 18 arranged in the outer cylinder 13, and thus the probe 30 is retained. Can be more effectively prevented.
[0028]
When the inside of the outer cylinder is full of the collapsible substance 42, the probe intrusion prevention device 10 can lift only the probe intrusion prevention device 10 to the ground, remove the collapsible object 42, and reinstall the probe 30. Therefore, the operation such as measurement can be continued without raising the probe 30 to the ground. In addition, by providing a water permeation hole in the outer cylinder or the cover 11, when the probe restraining device 10 is inserted into the underground water in the hole, it is possible to prevent the underground water from easily entering the outer cylinder 13 and floating in the water by buoyancy. And can be smoothly inserted into the hole.
[0029]
Depending on the situation in the borehole, the probe 30 may be restrained in the borehole. In this case, the rod is lowered into the hole and connected to the upper end of the inner cylinder 12. Next, while injecting muddy water toward the upper part of the probe 30, the rod and the lifting cable 31 are swung up and down. By repeating such an operation, the detention of the probe 30 can be released. When muddy water is injected into the inner cylinder 12, muddy water can be efficiently applied to the upper portion of the probe 30 along the cover 11, so that detention can be easily released.
[0030]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, a probe detainment prevention apparatus which can prevent a probe from being detained by taking in a collapsed substance inside can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a usage state of a probe retention device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the probe detention device of FIG. 1;
3A is a longitudinal sectional view showing a state in which a collapsed object is sandwiched, and FIG. 3B is a longitudinal sectional view showing a state in which the collapsed substance is taken in from a window.
FIG. 4 is a perspective view showing a modification of the outer cylinder of the probe restraint prevention device of FIG. 1;
5A is a cross-sectional view showing a modification of the inner cylinder of the probe restraint prevention device of FIG. 1, and FIG. 5B is a perspective view showing a modification of the cover and the lower outer cylinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Probe restraint prevention device 11 Cover 12 Inner tube 13 Outer tube 14 Supporting material 15 Through hole 16 Guide hole 18 Window 21 Upper outer tube 22 Lower outer tube 30 Probe 31 Elevating cable 40 Boring hole 41 Collapsed material

Claims (4)

A probe detention prevention device for preventing a probe suspended in a borehole from being detained by collapsing substances of the hole wall,
A cover capable of covering the upper end of the probe, having a through hole through which a lifting cable attached to the probe can be inserted,
An inner cylinder having a guide hole into which the lifting cable can be inserted,
It has an elasticity that can be deformed by the pressure of the collapsible material caught between the hole walls of the boring hole and can be restored by removing the pressure, has an opening at the upper end, supports the inner cylinder inside, and the lower end has the cover. The outer cylinder provided on the upper side of
A probe detention prevention device, comprising: The outer cylinder comprises an upper outer cylinder and a lower outer cylinder, the upper outer cylinder has a window around which a collapsed material can be taken in, and the lower outer cylinder can accommodate a collapsed material inside. The device according to claim 1, wherein a lower end is fixed to an outer periphery of the cover. 3. The probe restraint prevention device according to claim 2, wherein the inner cylinder or the outer cylinder has an engaging portion for lifting, and the lower outer cylinder or the cover has a water permeable hole. The upper outer cylinder has a lower end detachably attached to an upper end of the lower outer cylinder, and the inner cylinder is supported by an upper end of the upper outer cylinder and extends to the inside of the through-hole, and the lower outer cylinder 4. The probe retaining device according to claim 2, wherein said cover is provided so as to be openable and closable so as to open said through hole, and said inner cylinder is provided so as to be openable and closable so as to open said guide hole. Prevention device.

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