JP2002266585A - Wireline sampler and wireline sampling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-noise, small-sized, light-weight, highly mobile soil sampler for high-efficiency geological surveys without pore wall collapse, geological contamination or sample loss, and a sampling method using the sampler. provide. SOLUTION: An outer tube assembly which engages with a tip of a drill rod and rotates integrally therewith, and an inner tube which is removably inserted into the outer tube assembly and is fixed inside the outer tube assembly by a detachable mechanism. An assembly, a down-the-hole hammer provided in the inner tube assembly and hitting by fluid pressure, and a core tube provided at the lower end of the inner tube assembly and collecting a soil sample therein,
A swivel mechanism provided at the top of the core tube to allow rotation of the outer tube assembly, and the core tube slides in the shortening direction as the drill rod is pushed in, and the down-the-hole hammer operates to slide the core tube in the extending direction. Then, there is provided a control mechanism for stopping the operation of the down-the-hole hammer and bringing it into a blow state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil sampler and a sampling method for geological investigation using a wireline type sampler and a fluid pressure hammer.

[0002]

2. Description of the Related Art Soil sampling methods for geological surveys include:
Until now, the core tube was vibrated by applying vibration to the core tube using a rotary percussion drill (top hammer type), a wire line sampling system using a normal rotary boring machine, and a hammer or vibrator (top hammer type) mounted on an excavator. , A sampling method using a core tube and a φ40.5 mm rod by a usual rotary boring machine, or a method in which a down-the-hole hammer is conveyed to a wire line for non-core excavation without the purpose of sampling.

[0003] Such a conventional technique has the following disadvantages. (1) The sampling method using a rotary percussion drill is equipped with a hydraulic hammer on the ground, and has a drawback such as high metal hitting noise caused by operation of the hydraulic hammer. (2) The top hammer system including the rotary percussion drill often operates the hammer by hydraulic pressure, and requires an initial investment in expensive hydraulic equipment, and the size of the excavator is large, which is not preferable in field operation.

(3) In the top hammer system, the impact force transmitted to the lower end of the sampler (core tube) is attenuated as the depth increases, and a reduction in the sampling speed cannot be avoided.

(4) In a sampling using a conventional rotary boring machine, a striking force cannot be applied to a core tube, so that a sampling speed is low and a lot of cost and labor are required for setting up a water supply facility. I do.
In addition, there is a similar problem in the treatment of muddy water and excavated waste after the completion of the site soil survey. (5) In sampling using a normal rotary boring machine, water is used as a drilling fluid, which affects the water supply to the sample, and is particularly fatal when investigating water-soluble chemical substances. Furthermore, since the drilling speed is low in this method, the soft soil layer is often washed away by water supply before securing the sample in the core tube.

(6) A non-coring system for carrying a down-the-hole hammer on a wire line does not originally have a sampling function.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems by providing a low-noise, small-sized, light-weight, high-mobility, high-precision structure that does not cause hole wall collapse, formation contamination, or sample loss. An object of the present invention is to provide an efficient soil sampler for geological investigation and a sampling method using the sampler.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide an outer tube assembly which rotates integrally with a tip of a drill rod, and is detachably inserted into and removed from the outer tube assembly. An inner tube assembly that is inserted and fixed inside the outer tube assembly by an attaching / detaching mechanism, a down-the-hole hammer provided in the inner tube assembly and configured to strike by fluid pressure, and an inner tube assembly provided at a lower end of the inner tube assembly. A core tube for collecting a soil sample at
A swivel mechanism provided at the top of the core tube to allow rotation of the outer tube assembly, and the core tube slides in the shortening direction as the drill rod is pushed in, and the down-the-hole hammer operates to slide the core tube in the extending direction. Then, a control mechanism is provided for stopping the operation of the down-the-hole hammer and bringing it into a blow state.

Further, the control mechanism includes an urging member for urging the core tube to slide toward the lower end of the outer tube assembly, and sealing the fluid pressure when the core tube slides in a shortening direction. A valve mechanism that releases fluid pressure when the tube slides in the extension direction.

[0010] The core tube may include a split tube inserted into the core tube and holding a sample;
An inner ring that is detachably attached to the lower end of the split tube while communicating with the inside of the split tube and has a lower end that constitutes a cutting edge, and a piston that is provided at the upper end of the split tube and pushes the split tube out of the core tube. And characterized in that:

In the wire line sampling method using the wire line sampler, the core bit provided at the lower end of the outer tube assembly is settled on the ground with the inner tube assembly set in the outer tube assembly. When the drill rod is advanced and the down-the-hole hammer operates normally due to the supply of fluid pressure, it is determined that the inner tube assembly is securely set in the outer tube assembly. When is not activated, it is determined that the inner tube assembly is in an abnormally set state in the outer tube assembly.

[0012]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. A wireline down-the-hole drill sampler (hereinafter, referred to as a wireline sampler) according to an embodiment of the present invention is used for soil sampling for geological investigation using the impact force of a down-the-hole hammer (hereinafter, referred to as DTH). As shown in FIG. 1, a wire line sampler according to the present invention is provided with an outer tube assembly 10 which integrally rotates with an end of a drill rod (not shown) and which can be inserted into and removed from the outer tube assembly 10. And an inner tube assembly 20 inserted into the inner tube assembly.

The outer tube assembly 10 includes a core bit 11 having a tip 11a made of a hard material such as cemented carbide at the lower end, and an outer tube 1 in order from the lower end.
2, hanger ring 13, sub 14, hanger ring 15,
A guide coupling 16, a collar 17, and a coupling 18, except for the hanger rings 13 and 15, which are fitted and mounted, are sequentially screwed detachably. The upper end of the coupling 18 is detachably screwed to the lower end of the drill rod.

As shown in FIG. 2, the inner tube assembly 20 includes a DTH 40 that strikes by fluid pressure.
And a core tube 23 for collecting a soil sample therein.
And an attachment / detachment mechanism (clamping device) 50 for attaching / detaching the inner tube assembly 20 to / from the outer tube assembly 10, and these are each detachably screwed.

A core tube 23 is inserted into the core tube 23 and holds a sample. The core tube 23 is detachably attached to a lower end of the split tube 24 while communicating with the inside of the split tube 24. An inner ring 21 to be screwed is provided, and a piston 25 provided at an upper end of the split tube 24 and pushing the split tube 24 from the core tube 23.
The inner ring 21 also has a function of preventing the split tube 24 from coming off from the core tube 23. The lower end of the inner ring 21 constitutes a cutting edge, the shape of the lower end cutting edge, the protruding length or the inner diameter can be changed depending on the geological conditions, and the lower end is subjected to a wear-resistant treatment such as a hardening treatment to prevent abrasion. It has been subjected. In addition, a seal 22 such as an O-ring provided on the outer diameter of the inner ring 21 prevents foreign matter from entering the outer tube assembly 10.

As shown in FIG. 2, a shaft 26 is detachably screwed to the upper end of the core tube 23. A hanger body 28 is rotatably and axially slidably fitted to a pivot 26a on an upper portion of the shaft 26 via a shaft member 30, such as a spring pin, a bearing 31, and a cushion rubber 32, with an urging member 27 such as a spring interposed therebetween. And constitute a so-called swivel mechanism. This swivel mechanism has the following detailed configuration. The shaft 26 is fixed to the inner diameter portion of the hanger body 28 by sandwiching the left and right sides of a guide groove 26b provided with an appropriate width around the outer diameter portion of the pivot 26a of the shaft 26.
The hanger body 28 is guided by the
, And can rotate and slide in the axial direction. Along with this, the bearing 31 and the cushion rubber 32 also move inside the upper part of the inner diameter of the hanger body 28 so that the pivot 2
6a is allowed to rotate and slide, is slidably supported, and is sealed by a cushion rubber 32.

The DTH 40 has the same structure as that already on the market, and a detailed description thereof will be omitted. However, as shown in FIG. 2, in the present invention, the structure except for the bit normally connected to the lower end is used. And the casing 4 from the lower end
1, main components such as a hammer 42, a feed tube 43, an upper valve 44, a valve holder 45, and a main shaft 46.

A pivot 28a above the hanger body 28
Is fitted axially slidably in the lower end of the casing 41 of the DTH 40 via two shaft members 33 such as two spring pins fixed in the horizontal direction with the axis interposed therebetween, and the upper end surface thereof is a striking surface. 28d, it is facing (contacting) with the striking surface 42a at the lower end of the hammer 42. Both ends of the shaft member 33 are inserted and guided in guide long holes 41a which are provided in the casing 41 and are elongated in the axial direction. The hanger body 28 is restricted in the rotation direction with respect to the casing 41 and can slide in the axial direction. I have. Thus, the hanger body 28 can slide in the axial direction and rotate integrally with the DTH 40. Further, by this and the swivel mechanism, even if the DTH 40 and the outer tube assembly 10 rotate integrally, the members below the shaft 26 and the core tube 22 can slide in the axial direction while avoiding the rotation. The inner ring 21 at the lower end is the core bit 1 of the outer tube assembly 10.
The sample is protruded from the lower end of the sample 1 and can be collected without disturbing the sample. When the inner ring 21 has a short shape, the inner ring 21 may not necessarily project from the lower end of the core bit 11.

A seal 29 such as an O-ring that fits on the inner surface of the hanger ring 13 of the outer tube assembly 10 and maintains airtightness is fitted on the outer diameter of the hanger body 28. Further, an impact transmitting portion 2 provided with a step having an outer diameter protruding above the seal 29 of the hanger body 28 is provided.
The lower end surface of 8b transmits the impact force generated by the collision of the hammer 42 and the hanger body 28 by the operation of the DTH 40 to the core bit 11 of the outer tube assembly 10 via the upper end surface of the hanger ring 13. Since the DTH 40 can be easily disassembled, the hammer 42 is used depending on the geological conditions.
Is exchanged to increase or decrease the mass.
The impact force can be easily adjusted to increase or decrease.

The shaft 26 is provided with a fluid flow path 26d having at least two openings 26e on the upper and lower sides along the axis. Hanger body 28
A fluid flow path 28c is penetrated and penetrated along the axis, and four openings in the horizontal direction orthogonal to the side surface of a valve chamber 28d provided in communication with the lower part of the fluid flow path 28c. 28
e is provided. In the valve chamber 28d, the upper end 26c of the pivot 26a of the shaft 26 is fitted with high precision so as to be slidable in the axial direction and to maintain airtightness.
A so-called switching valve mechanism is configured. This switching valve mechanism forms the basis of a control mechanism for controlling the operation of the DTH 40, which will be described later, and its detailed functions are as follows. When the upper end 26c slides downward in the valve chamber 28d, the opening 28e is opened and the DTH 4 passing through the fluid flow path 28c is opened as shown in the left half vertical cross section of FIG.
0 working fluid (hereinafter referred to as compressed air)
Is discharged into the fluid flow path 26d. When the upper end 26c slides upward in the valve chamber 28d, the opening 28e is closed as shown in the right half vertical cross section of FIG.

A feed tube 43 fitted to the lower end of a fluid flow path 42b penetrated along the axis of the hammer 42 is provided at the upper end of the fluid flow path 28c of the hanger body 28 in the axial direction. Is slidably fitted to Hammer 4
A lower end of a valve holder 45 provided with an upper valve 44 therein along the axis from the upper end face is slidably fitted in the upper end of the second holder 2 in the axial direction.

A lower end of a main shaft 46 is fitted to an upper end of the valve holder 45, and the main shaft 46 is detachably attached to an upper end of the casing 41 via a shaft member 47 such as a spring pin. Mated. A step 46a having an outer diameter protruding is provided at the upper part of the shaft member 47 of the main shaft 46. When the inner tube assembly 20 is inserted and set in the outer tube assembly 10, a sub-step is provided at a predetermined position in the guide coupling 16. The lower end surface of the step 46a is positioned so as to face the upper end surface of the hanger ring 15 provided narrowly in contact with the upper end surface of the step 14. In the lower end of the main shaft 46, the main shaft 46 penetrates the lower end surface along the axis and penetrates in a direction perpendicular to the side surface of the step 46a (four openings 46e).
) Is provided.

The attachment / detachment mechanism (clamping device) 50 which engages with the upper part of the main shaft 46 mainly includes a latch 51, a latch case 52, and a spear 53, as shown in FIGS.
It is composed of The latch 51 hinged so that the two right and left claws can be narrowly opened by the pin 51a is guided by a guide elongated hole 52b that is long in the axial direction of the latch case 52, and is configured to be movable in the axial direction (up and down). . The main shaft 46 and the latch case 52 are provided with notches 46b and 52a having sufficient spaces so as not to interfere with the narrowing movement and the vertical movement of the latch 51, respectively. The spear 53 is detachably fitted into the upper end of the latch case 52 via a shaft member 54 such as a spring pin, and the lower portion 53a is formed of a seal 5 such as an O-ring.
5, and is fitted in the upper end portion of the main shaft 46 so as to slide in the axial direction and to be detachable.

FIG. 3 is a partial vertical cross-sectional view of the attaching / detaching mechanism (clamping device) 50 of the inner tube assembly 20 of the wire line sampler according to one embodiment of the present invention.
Indicates the open state of the inner tube assembly 20, (b)
Indicates a set state of the inner tube assembly 20.
The setting of the inner tube assembly 20 is performed according to the following procedure. The spear 53 of the inner tube assembly 20 is gripped and suspended in the outer tube assembly 10 by the overshot 111 set to the latch-out state, and the inner tube assembly 20 is brought to a predetermined position (the state of FIG. 3A). When it falls, the weight of the overshot 111 is applied to the spear 53. Then, the sharp end of the lower portion 53a of the spear 53 is pryed open from the upper end of the latch 51, and the setting of the inner tube assembly 20 is completed as shown in FIG. On this occasion,
The seal 55 is a seal fixing groove 46c of the main shaft 46.
And holds the spear 53 by the frictional force of the elasticity of the seal 55.

The opening (pulling) of the inner tube assembly 20 is performed in the following procedure. The overshot 111 set in the pulled state grips the spear 53 and winds up the wire line, and the overshot 111
Pull up 3. At this time, the pulling load of the spear 53 exceeds the frictional force due to the elasticity of the seal 55, and the spear 53 slides, and the tip of the lower portion 53a of the spear 53 comes off from the latch 51. As shown in FIG. 51 is unlocked. At this time, the latch case 52 moves upward, the back surface of the latch 51 is pushed inward by the lower end of the notch 52a, the latch 51 is closed, and the inner tube assembly 20 is opened.

Referring again to FIG. 1, the DTH 40 of the inner tube assembly 20 and the operation of the lower portion thereof (that is, a control mechanism for controlling the operation of the DTH 40) will be described in detail. FIG. 1 is a longitudinal sectional view of a wire line sampler according to an embodiment of the present invention, and a left half longitudinal sectional portion is DT.
H40 shows the blow state when operation is stopped, and the right half vertical section is D
This shows a TH40 operating state. The compressed air is supplied via the inside of the coupling 18 as indicated by an arrow 18a above the outer tube assembly 10. When the drill rod and outer tube assembly 10 are pushed in or when the digging resistance of the inner ring 21 is equal to or greater than the urging force (compression load) of the urging member 27, as shown in the right half vertical cross section of FIG. 27 is compressed and the core tube 23 is compressed.
Side is pushed up in the shortening direction and slides to
The upper end 26c of the pivot 26a closes the opening 28e. When the opening 28e is closed, the gap space 60 between the sub 14 and the casing 41 is sealed, and the compressed air is supplied from the flow passage 46d to operate the DTH 40. When the drill rod and the outer tube assembly 10 are pulled up or when the digging resistance of the inner ring 21 is equal to or less than the urging force (compression load) of the urging member 27, as shown in the left half vertical cross section of FIG. 27 is expanded and the core tube 23
The side slides downward in the extending direction, the upper end 26c of the pivot 26a opens the opening 28e, and the compressed air is discharged into the fluid flow path 26d of the shaft 26 via the fluid flow path 28c. Further, at this time, the compressed air is supplied to the opening 2.
6e is completely exhausted from the exhaust port 11b provided obliquely upward in the lower end core bit 11 via the clearance space 61 between the core tube 23 in the outer tube 12 and the lower end core bit 11, that is, the compressed air is released and the DTH 40 stops operating. Then, all of the compressed air is discharged (becomes a blow state). Thus, the control mechanism for controlling the operation / stop of the DTH 40 is as follows:
With the inner tube assembly 20 set in the outer tube assembly 10, the core tubes 23 are slid in the expansion and contraction direction (up and down) to switch the state of maintaining airtightness in the outer tube assembly 10 with a valve mechanism. Control of the operation or stop of.

Next, a description will be given of a wire line sampling method using the wire line sampler of the present invention having the above-described configuration. Inner tube assembly 2
0 was held at the lower end of the outer tube assembly 10 after the overshot 111 was recovered while the outer shot was held in the outer tube assembly 10 and set at a predetermined position while being gripped by the overshot 111 provided at the lower end of the wire line. When the core bit 11 is landed on the ground, a feeding force is applied to the drill rod, the core tube 23 is slid upward in the shortening direction, and compressed air is supplied. When the DTH 40 operates normally, the inner tube assembly 20 is turned on. Can be determined to be securely set in the outer tube assembly 10. On the other hand, when the DTH 40 does not operate even when compressed air is supplied, it can be determined that the inner tube assembly 20 is in an abnormal setting state in which the inner tube assembly 20 is not securely set in the outer tube assembly 10. In the initial step of the wire line sampling, the setting of the inner tube assembly 20 is confirmed. After confirming that the inner tube assembly 20 is securely set in the outer tube assembly 10, the soil at a predetermined depth from the inner ring 21 at the tip of the outer tube assembly 10 and the inner tube assembly 20 along with the excavation by the DTH 40. A sample is collected in the core tube 23. Next, by winding the overshot 111, the inner tube assembly 20 containing the soil sample is taken out to the ground.

The steps of the soil sampling method according to one embodiment of the present invention having the above-described configuration will be described in detail with reference to FIGS. 4 to 11 show an example in which a boring head 102 mounted on a guide cell 105 mounted on a traveling vehicle 120 such as a small crawler is used on a predetermined ground G to be subjected to a geological investigation. The boring head 102 runs on the guide cell 105 in the direction of the borehole axis. A drill rod 101 that engages with the boring head 102 or an outer tube assembly 10 that engages with the tip of the drill rod 101 is provided with a clamp 10 below the guide cell 105.
6. The DTH 40 is driven by excavation by sending compressed air from the air pipe 104 via the air swivel 103.

First, in a soil sampling start step (step 1) shown in FIG.
The pipe-shaped inner tube assembly 20 gripped by the 0 overshot 111 is mounted inside the distal end of the outer tube assembly 10 that engages with the drill rod 101. The inner tube assembly 20 to which the DTH 40 is attached is mounted inside the distal end of the outer tube assembly 10 connected to the distal end of the drill rod 101, and excavation is started and soil sampling is started.

Subsequently, in a first soil collection end step (step 2) shown in FIG. 5, excavation is performed to a predetermined first drilling hole depth, and collection of the soil sample 130 is completed.

Therefore, in the overshot insertion step (step 3) shown in FIG. 6, the boring head 102 is separated from the drill rod 101 and retreated to the retracted position, and the overshot 111 of the wire line 110 is removed from the drill rod 1
01 from the top.

Thereafter, in the soil recovery step (step 4) shown in FIG. 7, the spear 53 at the upper end of the inner tube assembly 20 containing the soil sample 130 in the core tube 23 is gripped by the overshot 111 and rolled up. 20 is taken out on the ground and the soil sample 130
Collect.

In the inner tube assembly insertion step (step 5) shown in FIG. 8 again, the empty inner tube assembly 20 gripped by the overshot 111 of the wire line 110 is inserted from the upper end of the drill rod 101 into the outer tube. It is mounted inside the tip of the assembly 10.

Further, in the drill rod adding step (step 6) shown in FIG. 9, after the overshot 111 of the wire line 110 is wound up and collected, a drill rod 101 having a predetermined length is added.

Again, in the second soil collection start step (step 7) shown in FIG. 10, the boring head 102 is moved forward and connected with the drill rod 101 to resume drilling.

Subsequently, in a second soil sampling end step (step 8) shown in FIG. 11, excavation is performed to a predetermined second excavation hole depth, and sampling of the soil sample 130 is ended. Thereafter, the process returns to the process 3 and is repeatedly performed to a predetermined depth.
Collect 0.

[0037]

According to the present invention described in detail above,
The following excellent effects are provided. (1) By sampling using DTH impact and selecting core bits according to the formation, the N value is 0
Sampling from soft ground of about 50 to gravel layer is possible. In addition, since the hammer operates underground, there is little influence of noise generation on the surroundings. Furthermore, since mud water or fresh water is not used, there is no influence of drilling water such as contamination of the stratum and loss of the sample. (2) Compressed air sent from an inexpensive compressor that is separate from the excavator body can be used as the working fluid for DTH, so that the size of the excavator body can be reduced and the initial investment can be significantly reduced. is there. Furthermore, since the sampler is pressed into the stratum, there is no discharge of cutting waste, and there is no need to treat muddy water and cutting waste after the completion of the on-site soil survey, and the environmental load is low. (3) Since the DTH is located immediately above the core bit, the impact force does not decrease due to the increase in the depth, and the sampling speed does not decrease. The sampling speed is 3 to 10 times that of a normal rotary boring machine. (4) Since the wire line method uses the double tube system of the outer tube assembly and the inner tube assembly, the rod wall does not move up and down and the collapse of the hole wall can be prevented. Further, since the core tube is inserted and recovered by wire line transfer, the operation time is greatly reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a wire line down-the-hole drill sampler (wire line sampler) according to an embodiment of the present invention, in which a left-half longitudinal section shows a blow state in which down-the-hole hammer operation is stopped, and a right-half longitudinal section shows a down-the-hole hammer. Indicates the operating state.

FIG. 2 is a longitudinal sectional view of an inner tube assembly of the wireline sampler according to one embodiment of the present invention.

3A and 3B are partial longitudinal sectional views of an inner tube assembly attaching / detaching mechanism (clamping device) of a wire line sampler according to an embodiment of the present invention, wherein FIG. 3A is an inner tube assembly open state view, and FIG. It is an inner tube assembly set state diagram.

FIG. 4 is a partial longitudinal sectional view showing a soil sampling start step (step 1) by the wire line sampler of the present invention.

FIG. 5 is a partial longitudinal sectional view showing a first soil collection ending step (step 2) by the wire line sampler of the present invention.

FIG. 6 is a partial longitudinal sectional view showing an overshot insertion step (step 3) by the wire line sampler of the present invention.

FIG. 7 is a partial longitudinal sectional view showing a soil recovery step (step 4) using the wireline sampler of the present invention.

FIG. 8 is a partial longitudinal sectional view showing an inner tube assembly inserting step (step 5) by the wire line sampler of the present invention.

FIG. 9 is a partial longitudinal sectional view showing a drill rod replenishing step (step 6) by the wire line sampler of the present invention.

FIG. 10 is a partial longitudinal sectional view showing a second soil collection start step (step 7) by the wire line sampler of the present invention.

FIG. 11 is a partial longitudinal sectional view showing a second soil collection end step (step 8) by the wire line sampler of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Outer tube assembly 11 Core bit 11a Tip 11b Exhaust port 12 Outer tube 13, 15 Hanger 14 Sub 16 Guide coupling 17 Collar 18 Coupling 18a Arrow (in the direction of compressed air flow) 20 Inner tube assembly 21 Inner ring 22, 29 , 55 Seal (such as O-ring) 23 Inner tube (core tube) 24 Split tube (inner tube) 25 Piston 26 Shaft 26a Pivot shaft 26b (of shaft 26) Guide groove 26c Upper end portion (of shaft 26) 26d, 28c, 42b , 46d Fluid flow passages 26e, 28e, 46e Opening 27 Energizing member (such as a spring) 28 Hanger body 28a, 42a Striking surface 28b Shock transmitting portion (step) 28d Valve chamber 30, 33, 47 Shaft member such as spring pin 31 Bearing 32 Cushion rubber 40 Down-the-hole hammer 41 Casing 41a, 52b Guide long hole 42 Hammer 43 Feed tube 44 Upper valve 45 Valve holder 46 Main shaft 46a Step 46b, 52a Notch 46c Seal fixing groove 50 Detachment Mechanism (clamping device) 51 Latch 52 Latch case 53 Spear 53a Lower part (of spear) 60, 61 (Gap between outer tube assembly and inner tube assembly) Space 101 Drill rod 102 Boring head 103 Air swivel 104 Air piping 105 Guide cell 106 Clamp 110 wireline 111 overshot 120 traveling trolley 121 hoist 130 soil (sample) G ground

Claims (4)

[Claims] 1. An outer tube assembly engaged with a tip of a drill rod to rotate integrally therewith, and an inner member removably inserted into the outer tube assembly and fixed inside the outer tube assembly by a detachable mechanism. A tube assembly, a down-the-hole hammer provided in the inner tube assembly and hitting by fluid pressure, a core tube provided at a lower end portion of the inner tube assembly and collecting a soil sample therein, and provided at an upper portion of the core tube A swivel mechanism that allows rotation of the outer tube assembly; and a down-the-hole hammer operates when the core tube slides in a shortening direction with the pushing of the drill rod, and a down-the-hole hammer operates when the core tube slides in an extending direction. Stop Wireline sampler, characterized in that it comprises a control mechanism such that the blowing state. 2. The control mechanism includes: an urging member for urging the core tube to slide toward a lower end of the outer tube assembly; and a sealing member that seals the fluid pressure when the core tube slides in a shortening direction. The wire line sampler according to claim 1, further comprising a valve mechanism that releases fluid pressure when the tube slides in the extension direction. 3. The split tube which is inserted into the core tube to hold a sample, and which is detachably attached to a lower end portion of the split tube while communicating with the inside of the split tube, and the lower end of which is cut off. The wire line sampler according to claim 1, further comprising: an inner ring constituting a blade; and a piston provided at an upper end of the split tube and for pushing out the split tube from the core tube. 4. A wire line sampling method using the wire line sampler according to claim 1, wherein the inner tube assembly is set in the outer tube assembly. When the core bit provided at the lower end is landed on the ground to feed the drill rod, and when the down-the-hole hammer operates normally due to the supply of fluid pressure, it is assumed that the inner tube assembly is securely set in the outer tube assembly. A wire line sampling method comprising: judging, if the down-the-hole hammer does not operate even when fluid pressure is supplied, it is judged that the inner tube assembly is abnormally set in the outer tube assembly.