JP3846656B2 - Boring hole bottom cleaning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for collecting and cleaning sediment accumulated in the bottom of a borehole in preparation for installing a seismometer or the like on the bottom of a borehole formed in the ground.
[0002]
[Prior art]
Conventionally, drilling holes of tens to thousands of meters have been drilled in the crust of rocks, etc. for observations of microearthquakes, geology, and ground, and various observations such as seismometers and inclinometers have been made at the bottom of the holes. Installation of equipment is carried out.
In the boring work, mud and rock fragments generated during excavation are being sucked together with mud water by a pump.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional boring construction as described above, after completion of the boring hole, debris generated during excavation and floating in the water in the boring hole is settled to the bottom of the hole and stored in a muddy state. As a result, the installation of observation equipment is often hindered.
Accordingly, the present invention provides a boring hole bottom cleaning device that can efficiently collect deposits accumulated at the hole bottom after completion of the boring hole in a cylindrical case that is suspended from the hole bottom. And
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the boring hole bottom cleaning device of the present invention is slidable along the inner peripheral wall of the upper end opening and the cylindrical case with the lower end opening suspended along the boring hole. The piston-like upper water-tight valve, the piston-like lower water-tight valve slidably arranged along the bottom inner peripheral wall of the case, and the upper water-tight valve and the lower water-tight valve are integrally connected. A pressure receiving area on the upper surface of the upper watertight valve that receives external pressure from above through the upper end opening, and a pressure receiving area on the lower surface of the lower watertight valve that receives external pressure from below through the lower end opening. And a stopper that prevents the valve structure from falling downward from the case, and is provided on the lower watertight valve so as to protrude downward from the lower end of the case. And the lower watertight valve rises relative to the case when the protrusion comes into contact with the bottom surface of the boring hole and separates from the inner peripheral wall of the bottom of the case. It is characterized in that a gap is formed between the outer periphery of the valve and the inner peripheral wall of the case.
[0005]
In the above-described boring hole bottom cleaning device of the present invention, the cylindrical case suspended along the boring hole may be lowered while the internal space is maintained at atmospheric pressure by the upper watertight valve and the lower watertight valve. it can. That is, the pressure-receiving area on the upper surface of the upper water-tight valve is larger than the pressure-receiving area on the lower surface of the lower water-tight valve, so that the upper water-tight valve and the lower water-tight valve are joined together with a connecting rod even if the fluid pressure in the borehole is high. The valve structure as a whole is pressed downward and held by the stopper, and the lower end opening of the cylindrical case is kept closed by the lower watertight valve.
[0006]
In this way, the cylindrical case descends in the boring hole while maintaining its internal space at atmospheric pressure, but when reaching the bottom of the hole, the protruding portion protruding downward from the lower watertight valve In contact with the bottom of the hole, the valve structure rises relative to the cylindrical case. Along with this, a gap is formed between the outer periphery of the lower watertight valve and the inner peripheral wall of the cylindrical case, so that the sediment accumulated in a high pressure state together with water on the bottom surface of the boring hole It suddenly enters into the cylindrical case in the atmospheric pressure state through the lower end opening.
[0007]
Next, by pulling up the cylindrical case, the precipitate is collected on the ground, and the hole bottom can be efficiently cleaned by repeating such operations.
[0008]
In addition, when the lower watertight valve is detached upward from the inner wall of the bottom of the case, a ratchet for maintaining the separation state and maintaining the gap is attached to the rod member protruding upward from the upper watertight valve. When the ratchet is configured to elastically pass through the through hole of the rod member in the top wall of the case and then open, the sediment at the bottom of the bore hole is formed inside the cylindrical case. When the cylindrical case is pulled up with the object taken in, a gap between the outer periphery of the lower watertight valve and the inner peripheral wall of the cylindrical case is maintained by the action of the ratchet. There is an advantage that the operation of pulling up the precipitate that has fallen into the drained state in this way is easy because the moisture contained in the material falls from the gap.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a boring hole bottom cleaning device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a longitudinal sectional view showing a state where the boring hole bottom is reached, and FIG. It is a longitudinal cross-sectional view which shows the draining state at the time of pulling up from a boring hole bottom part.
[0010]
As shown in FIG. 1, in the present embodiment, a cylindrical case 1 as a device main body suspended by a suspension rope 6 along a boring hole is formed with an upper end opening 1d and a lower end opening 1e. A piston-like upper water-tight valve 2 and a piston-like lower water-tight valve 3 are provided to open and close the openings 1d and 1e, respectively. The upper water-tight valve 2 is slidably fitted along the large-diameter inner peripheral wall 1a of the case 1. The lower watertight valve 3 is slidably fitted along the small-diameter bottom inner peripheral wall 1b of the case 1. Therefore, as shown in FIG. 2, when the lower watertight valve 3 rises and escapes upward from the bottom inner peripheral wall 1b, a gap a is formed between the lower watertight valve 3 and the large inner peripheral wall 1a of the case 1. It is like that.
[0011]
The upper water-tight valve 2 and the lower water-tight valve 3 are integrally coupled by a connecting rod 4 to constitute a valve structure V.
Further, a stopper 1 f that prevents the valve structure V from dropping is formed as a small-diameter peripheral portion at the bottom of the case 1.
[0012]
Furthermore, in this embodiment, the pressure receiving area where the upper surface of the upper watertight valve 2 receives external pressure from above through the upper end opening 1d of the case 1 is the pressure receiving area where the lower surface of the lower watertight valve 3 receives external pressure from below through the lower end opening 1e of the case 1. Due to the difference in the pressure receiving area, the valve structure V is pressed downward by the external pressure and pressed against the stopper 1f due to the difference in pressure receiving area. .
[0013]
Further, the lower watertight valve 3 is provided with a protruding portion 3a that can protrude downward from the lower end of the case 1, and the protruding portion 3a contacts the bottom surface 10a of the boring hole 10 as shown in FIG. At this time, as the lower watertight valve 3 rises relatively with respect to the case 1 and separates from the bottom inner peripheral wall 1b of the case 1, the above-described gap a is formed.
[0014]
Further, when the lower watertight valve 3 is detached upward from the bottom inner peripheral wall 1b of the case 1, a ratchet 5 for maintaining the detached state and maintaining the gap a protrudes upward from the upper watertight valve 2 to the case 1. As shown in FIG. 1, the ratchet 5 is normally present at a position below the top wall through hole 1c. The rod member 4a is inserted into the top wall through hole 1c. Yes.
[0015]
Then, when the ratchet 5 is elastically pushed and passes through the top wall through hole 1c as the valve structure V rises with respect to the case 1, as shown in FIG. 2, the ratchet 5 is opened again by a built-in spring (not shown), As shown in FIG. 3, the valve structure V is maintained in a state in which a gap a is formed.
[0016]
In the above-described boring hole bottom cleaning device of the present embodiment, the cylindrical case 1 suspended along the boring hole 10 is lowered while the internal space is maintained at atmospheric pressure by the upper watertight valve 2 and the lower watertight valve 3. I can go. That is, since the pressure receiving area on the upper surface of the upper watertight valve 2 is larger than the pressure receiving area on the lower surface of the lower watertight valve 3, the upper watertight valve 2 and the lower watertight valve 3 are connected even if the fluid pressure in the bore hole 10 is high. The valve structure V integrally coupled with the rod 4 is pressed downward as a whole and is held by the stopper 1f, and the lower end opening 1e of the cylindrical case 1 is kept closed by the lower watertight valve 3. It is.
[0017]
In this way, the cylindrical case 1 descends in the borehole 10 while maintaining the internal space at atmospheric pressure. When the cylindrical case 1 reaches the bottom 10a, the cylindrical case 1 protrudes downward from the lower watertight valve 3. The protrusion 3 a comes into contact with the hole bottom 10 a, and the valve structure V rises relative to the cylindrical case 1. Along with this, a gap a is formed between the outer periphery of the lower watertight valve 3 and the inner peripheral wall 1a of the cylindrical case 1, so that the sediment accumulated in a high pressure state with water on the bottom surface 10a of the boring hole 10 is Through the lower end opening 1 e of the cylindrical case 1, it suddenly enters the cylindrical case 1 in the atmospheric pressure state as shown by the flow 7 of the arrow.
[0018]
Next, by pulling up the cylindrical case 1, the precipitate is collected on the ground, and the hole bottom 10a is efficiently cleaned by repeating such operations.
[0019]
Further, as shown in FIG. 3, when the cylindrical case 1 is pulled up with the sediment at the bottom of the boring hole taken into the inside of the cylindrical case 1, the lower watertight valve is operated by the ratchet 5. 3, and the gap a between the outer periphery of the cylindrical case 1 and the inner peripheral wall 1a of the cylindrical case 1 is maintained, so that the water contained in the precipitate 7a falls from the gap a as indicated by the flow 7b of the arrow, There is an advantage that the operation of pulling up the precipitate 7a becomes easy.
[0020]
【The invention's effect】
As described above in detail, according to the boring hole bottom cleaning device of the present invention, the following effects can be obtained.
(1) When the cylindrical case suspended along the borehole reaches the bottom of the borehole, the valve structure is pushed up, leaving a gap around the lower watertight valve. As a result, the sediment accumulated in a high pressure state at the bottom of the borehole suddenly enters the cylindrical case together with water, and thus, by repeating the collection operation of the sediment to the ground, It becomes possible to clean the bottom of the borehole accurately. .
(2) When the valve structure is provided with a ratchet for maintaining the gap, drainage is drained through the gap when the sediment at the bottom of the borehole is taken into the cylindrical case together with water and then pulled up. And there is an effect that only the precipitate can be efficiently recovered.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a boring hole bottom cleaning device as one embodiment of the present invention.
2 is a longitudinal sectional view showing an operation state when the apparatus of FIG. 1 reaches the bottom of the boring hole.
3 is a longitudinal sectional view showing a state in which the apparatus of FIG. 2 has started to be pulled up from the bottom of the borehole.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical case 1a Case inner peripheral wall 1b Case bottom inner peripheral wall 1c Case top wall through-hole 1d Case upper end opening 1e Case lower end opening 1f Stopper 2 Upper watertight valve 3 Lower watertight valve 3a Projection part 4 Connecting rod 4a Rod member 5 Ratchet 6 Hanging Line 7 Flow 7a Flow of sediment 7b taken in the case
10 Boring hole
10a Boring hole bottom a Clearance V Valve structure

Claims (2)

A piston-like upper watertight valve disposed slidably along an inner peripheral wall of the upper end opening and lower end opening suspended along the boring hole, and a bottom inner peripheral wall of the case And a valve structure comprising a piston-like lower water-tight valve slidably disposed along the upper and lower water-tight valves and a connecting rod for integrally connecting the upper water-tight valve and the lower water-tight valve. The pressure receiving area of the upper surface of the upper watertight valve that receives external pressure is set larger than the pressure receiving area of the lower surface of the lower watertight valve that receives external pressure from below through the lower end opening, and the valve structure is downward from the case. A stopper is provided to prevent falling, and the lower watertight valve is provided with a protrusion that can protrude downward from the lower end of the case, and the protrusion contacts the bottom surface of the boring hole. A gap is formed between the outer periphery of the lower watertight valve and the inner peripheral wall of the case as the lower watertight valve rises relative to the case and separates from the bottom inner peripheral wall of the case. A boring hole bottom cleaning device, characterized in that it is configured. The boring hole bottom cleaning device according to claim 1, wherein when the lower watertight valve is detached upward from the inner peripheral wall of the bottom of the case, a ratchet for maintaining the separated state and maintaining the gap is provided on the upper portion of the bowling hole bottom cleaning device. Mounted on a rod member protruding upward from the watertight valve, the ratchet is configured to elastically pass through the through hole of the rod member in the top wall of the case and then open, Boring hole bottom cleaning device.

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