JPH0378479B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a gravel sampler used in air drilling type drilling operations.

[Technical Background of the Invention] A gravel sampler is used in an air drilling method that pumps air into a hole during drilling work to cool the tip of the drill bit inserted into the ground and to transport rock powder out of the hole. Conventionally, it is known to consist of a sampler tube for drilling and sampling, and a casing for holding the inner wall of the drilled hole, with air being pumped between the two.

By the way, as a gravel sampler of this type, there is an invention described in Japanese Patent Publication No. 56-4712.

[Problems with the Background Art] However, the invention described in Japanese Patent Publication No. 56-4712 rotates both the inner sampler tube (digging tube and rock core extractor) and the outer casing (hole storage tube). Because of this, the rotation of the sampler tube disturbs the sample, making it difficult to collect. Furthermore, since the bit at the tip of the sampler tube is flat during rotation, this also disturbs the sample even more, making it difficult to collect the sample into the sampler tube. In addition, such disturbance of the sample causes the collapse of the borehole wall and increases the load applied to the casing, which becomes a major obstacle to the continuation of drilling, which has also been a problem.
Furthermore, in the case of large gravel or hard strata, it may not be possible to collect samples due to the limited excavation force due to rotational force, which also has the drawback of limiting the scope of use.

[Object of the Invention] The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to provide a structure in which only the casing is rotated without rotating the sampler tube. To provide a gravel sampler which can be easily sampled without viewing, does not collapse the wall of an excavation hole, and can be used for a wide range of applications, allowing sufficient excavation even in large gravel and hard strata.

[Summary of the Invention] The gravel sampler according to the present invention connects the rod and the sampler tube through a rotational force absorbing means, so that only the casing can be rotated without rotating the sampler tube with the rotation of the rod. This makes it easier to collect samples without disturbing them, and the drilling force is increased by blowing air into the rod in the sampler and hitting the sampler tube with an air hammer between the rod and the sampler tube. It is something.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows an example in which the gravel sampler of the present invention is applied to an air excavation device that utilizes foam.

In the figure, 1 is a boring machine for excavation, 2 is a rod thereof, and 3 is a gravel sampler of the present invention attached to the tip of the rod 2. rod 2
An air hose 5 for excavation extending from the main compressor 4 is connected to the upper end.
This allows compressed air to be supplied to the tip of the gravel sampler 3. A foam supplying air hose 7 extending from a foam generation compressor 6 is connected to the middle of this excavation air hose 5, and a foam generation device 8 is installed in the middle of this foam supplying air hose 7. The drug is being supplied.

The gravel sampler of the present invention has a configuration as shown in FIG.

In the figure, a casing head 12 is provided at the upper end of the casing 11 so as to surround the rod 2.
is attached, and a chuck 13 attached to the upper part of the casing head 12 is tightened and fixed to the rod 2, thereby connecting the rod and the casing 11. Below the casing head 12,
Distributor 14 via O-ring 14a
is provided, thereby connecting the rod 2 and the rod 15 in the sampler. At this point, the air sent into the rod 2 is divided, one into the rod 15 and the other into the casing 1.
1 and the rod 15, and a valve 14b for keeping the air pressure on the rod 15 constant is provided in the branch passage on the latter side.

A connecting rod 18 for the sampler tube 17 is attached to the lower end of the rod 15 via a bearing 16 so that the sampler tube 17 does not rotate as the rod 15 rotates.
An air hammer 19 is provided so as to surround the rod 18, and is configured to strike the sampler tube 17 from above using air pressure within the rod 18. In this case, the air pressure inside the rod 18 is reduced to the valve 14b of the distributor 14.
is kept constant by Furthermore, the air hammer 19 is always urged upward by a spring 19a.

The sampler tube 17 includes a transparent inner tube 20 and an outer tube 21 for maintaining strength.
It has a double structure with the inside and outside removable, and a cone point 22 with an acute angle is attached to the tip. Furthermore, the tips of the sampler tube 17 and the casing 11 are such that the casing 11 is always located above, so that the air ejected from between them can be directly directed to the rock core being sampled. It looks like it won't hit. Further, a metal crown 23 having a flat tip is attached to the tip of the casing 11.

The present embodiment having the above configuration operates as follows.

First, as shown in FIG. 1, compressed air is sent to the gravel sampler 3 through the excavation air hose 5 by the action of the main compressor 4, and at the same time, compressed air is sent from the foam generation compressor 6 to the foam generation device 8. The bubbles generated here are transferred to the air hose 7 for bubble generation.
It is supplied into the excavation air hose 5 through the excavation air hose 5, and sent to the gravel sampler 3 together with the excavation compressed air inside. Then, when air and bubbles begin to be discharged from the drill tip 22, the boring machine 1 is started,
As a result, the rod 2 rotates, and the gravel sampler 3 operates as follows.

Therefore, when the rod 2 starts rotating,
Casing 1 fixed with this and chuck 13
The metal crown 23 at the tip rotates with 1.
Excavation will be carried out at. On the other hand, since the sampler tube 17 and the air hammer 19 are connected to the rod 2 by a bearing 16, they do not rotate even when the rod 2 rotates, and excavate with the tip 22 that does not rotate with the rotation of the casing 11. will be done. Therefore, since the sampler tube 17 does not rotate, disturbance of the sample is greatly reduced, and since the tip of the sampler tube is made at an acute angle, sampling of the sample becomes extremely easy. In addition, the reduction in sample turbulence also minimized the collapse of the borehole wall, which was a major obstacle in drilling operations. The load applied to the casing 11 can be reduced.

On the other hand, the bubbles and air sent from Rod 2,
The distributor 14 divides the air into the rod 15 and between the rod 15 and the casing 11, and the former operates the air hammer 19, while the latter operates the air hammer 19 between the casing 11 and the sampler tube 17.
By ejecting this from between the tips of the holes, the rock powder inside the borehole is discharged. The air pressure inside the rods 15 and 18 is maintained at a constant pressure by the action of the valve 14b provided in the distributor 14, and as a result, the air hammer 19 is inserted into the sampler tube 17.
hit. Therefore, even in large gravel, hard strata, etc., the pressing force of the air hammer 19 provides sufficient excavation force, and the range of use is greatly expanded.

After collecting the sample, loosen the chuck 13 and
By removing the casing head 12 from the casing 11, these, the rod 2, and the sampler tube 17 are pulled up together. At this time, since the inside and outside of the sampler tube 17 can be removed,
By removing the outer tube 21, the sample collected inside the transparent inner tube 20 can be observed from the outside without changing it. Also,
By leaving the casing 11 in the borehole, collapse of the borehole wall is prevented, so the drilling work can be continued by setting the rod 2 and sampler tube 17 again.

[Effects of the Invention] As explained above, according to the present invention, the sampler tube is hit with an air hammer without rotating it, so that the sample can be easily collected without disturbing the sample. In addition, it is possible to provide a gravel sampler that can be used over a wide range of applications, without collapsing the walls of the excavation hole, and having sufficient excavation power even in large gravel or hard strata.

[Brief explanation of drawings]

FIG. 1 is an overall view showing an air excavation device to which a gravel sampler according to the present invention is applied, and FIG. 2 is a sectional view showing an embodiment of the gravel sampler according to the present invention. 1... Bowling machine, 2... Rod, 3...
...Gravel sampler, 11...Casing, 12...
Casing head, 13...Chick, 14...
Distributor, 14a...O ring, 14
b... Valve, 15... Rod, 16... Bearing, 17... Sampler tube, 18... Rod, 19... Air hammer, 19a... Spring, 20... Inner tube, 21... Outer tube, 22 ...Awl tip, 23...Metal crown.

Claims (1)

[Scope of Claims] 1. A casing that is used during drilling work in an air drilling method and is removably fixed to the tip of a rotating rod, and a means for absorbing the rotational force of the rod at the tip of the rod inserted into the casing. This is a gravel sampler consisting of a sampler tube attached through the rod, and a tip is provided at the tip of the sampler tube, and an air hammer for hitting the sampler tube is provided between the rod and the sampler tube. In addition, the air sent into the rod was divided into two parts so that the pressure of one part operated the air hammer, and the other part passed between the sampler tube and the casing and was ejected from the tip of the hammer. A gravel sampler characterized by: 2. The gravel sampler according to claim 1, wherein the means for absorbing the rotational force of the rod is a bearing. 3. The air fed into the rod is divided by a distributor having a valve, and the valve operates the air hammer by keeping the air pressure on the air hammer side constant. The gravel sampler described in item 1.