JPH0833092B2 - Drilling equipment for geological surveys - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a drilling device for geological survey capable of collecting a sample of sediment for geological survey.

(Prior art) When excavating, excavation may be carried out while investigating the soil quality of the soil to be excavated. In that case, conventionally, a sample was taken while the excavator was excavating, and the excavator including the excavating pipe was pulled up every time the excavator was excavated, and the earth and sand was excavated in the cylinder provided at the tip. With this method, when the excavator is pulled up, the wall surface of the excavated hole collapses and the upper layer of earth and sand falls to the bottom of the hole, and when the next excavation is carried out, the upper layer of earth and sand also falls into the lower layer of earth and sand. However, the reliability of the sample becomes low because it is collected as the sample. In order to solve this point, a method is proposed in which first, a large-diameter drill pipe is used for drilling, and then a drilling device other than the drilling pipe is pulled up, and then a cylinder for sampling is attached to the drilling device to proceed deeper than the drilling pipe. Was done. According to this method, collapse of the wall surface of the drill hole can be prevented,
Accurate sample collection is possible.

(Problems to be Solved by the Invention) However, the above-described conventional excavation method using a large-diameter pipe has the following problems.

In order to proceed with excavation, dig a large diameter drill pipe,
Then, the cylinder for sampling must be dug.
Therefore, since the excavation of the large diameter pipe and the excavation of the cylindrical body are separate, there is a problem that the longer the excavation depth is, the longer the work takes.

Therefore, it is an object of the present invention to provide an excavation device for geological survey capable of efficiently excavating an excavation pipe for preventing wall collapse of an excavation hole and a sampling means at the same time.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration.

That is, an excavating pipe, a device portion that advances in the excavating direction while rotating through a driving means in the excavating pipe, and is formed in a ring shape, and an excavating side end portion of the excavating pipe for moving the excavating pipe with it. Is rotatably disposed with the same axis as the drill pipe, is in contact with the drill side end of the drill pipe, and is detachable from the device section. A ring bit part that can rotate and move integrally with the part, and is formed into a tubular shape having an opening on the end face on the excavation side, which can be inserted into the center hole of the ring bit part, and the end opposite to the excavation side. In the excavation device for geological survey, the part is connected to the device part, and the inner bit part is rotatable and movable integrally with the device part. A plurality of excavation bits are fixed to the excavation side end surface of the flange, and a plurality of excavation bits are fixed to the excavation side end surface of the inner bit portion around the opening. It is characterized by

(Operation) The operation will be described.

When the driving means rotates the device part and advances it in the excavating direction, the ring bit part and the inner bit part rotate and proceed in the excavating direction. Since the excavating pipe is arranged in the ring bit part, the ring bit part And dig together. Therefore, it becomes possible to simultaneously advance the excavation pipe and the inner bit portion for collecting the sample in the excavation direction.

At that time, since a plurality of excavating bits are fixed around the excavation side end surface of the flange radially extended to the excavation side end portion of the ring bit portion and the opening portion of the excavation side end surface of the inner bit portion, It becomes possible to dig while excavating the earth and sand with the digging bit.

(Examples) Hereinafter, preferred examples of the present invention will be described in detail with reference to the accompanying drawings.

First, the configuration will be described with reference to FIG. 1 (partial cross-sectional view of the excavating device of the embodiment) and FIG.

 Reference numeral 10 is a drill pipe, which is a metal cylindrical pipe.

12 is a ring bit part, and flanges 14 and 16 are attached to the upper and lower ends.
Are formed. On the bottom surface of the flange 16 of the rig bit part 12, a plurality of cemented carbide bits 18 for excavating earth and sand ...
・ Is fixed. The lower ends of the bits 18 ... Project downward from the bottom surface of the ring bit portion 12.

Numerals 20 and 22 are metal collar constituent members, which are rotatably fitted onto a small-diameter body portion 24 of the ring bit portion 12. The abutting end faces of the collar constituent members 20, 22 are fixed to each other by welding or the like to form a tubular collar 26 with both ends open. Color
Reference numeral 26 is fixed to the inner wall surface of the lower end portion which is the end portion of the excavation pipe 10 in the excavation direction. Since the collar 26 contacts the flanges 14 and 16 of the ring bit portion 12, the ring bit portion 12 can move integrally with the drill pipe 10 in the drilling direction.

Reference numeral 28 denotes an inner bit portion, which is a base body 30 and a connecting body 32.
And a cylindrical body 34 and an inner cylinder 36. A flange 38 is formed at the upper end of the base body 30, the outer diameter of the flange 38 is formed larger than the inner diameter of the center hole 40 of the ring bit portion 12, and the downward movement of the inner bit portion 28 is restricted. Slime grooves 42 and 44 are formed on both outer sides of the base body 30 that is loosely inserted into the center hole 40 of the ring bit portion 12, and the bit of the ring bit portion 12 is formed.
The slime excavated by 18 ... is removed in the direction of arrow A. A ring bit portion is provided on the lower surface of the flange 38 of the base body 30.
A protrusion 50 (see FIG. 3) engageable with the recessed grooves 46 and 48 formed on the upper surface of the flange 14 of 12 is formed, and the engagement causes the ring bit portion 12 and the inner bit portion 28 to be connected. Can rotate together. Further, inside the base body 30, an air passage 52 is formed, one end of which opens to the upper surface and the other end of which opens to the outer surface. This air passage 52 is provided with an air hammer described later.
It is provided to remove the compressed air in 54.

The tubular body 34 is made of metal, and both upper and lower ends are open. The opening 56 at the lower end is formed as an opening having a diameter smaller than the inner diameter, and a plurality of cemented carbide bits 58 ... Are fixed around the opening 56 at the lower end surface for excavating earth and sand. Bit 58 ...
-The lower end of the cylinder also projects downward from the bottom surface of the cylindrical body 34. Tube 34
A through hole 60 for bleeding air is also provided on the side surface of.

A male screw portion is formed on each of the outer wall of the upper end portion of the cylindrical body 34 and the outer wall of the lower end portion of the base body 30.
The tubular body 34 and the base body 10 are integrated by 32.

The inner cylinder 36 is formed into a cylindrical shape in which two inner cylinder constituent members 62 and 64 having a semi-cylindrical shape are combined inside the cylindrical body 34 and one upper and lower ends are opened. The lower end surface of the inner cylinder 36 is in contact with the inner bottom surface of the cylindrical body 34 to prevent the inner cylinder 36 from coming off.

Reference numeral 66 denotes a device portion, which rotates in the excavating pipe 10 and moves downward in the excavating direction when the top portion is hit by an air hammer 54 which is an example of driving means. Device section
A flange 68 is formed at the lower end of 66, and the inner bit part
It is connected to the flange 38 of the base body 30 of 28 via bolts (not shown). As a result, the device portion 66, the inner bit portion 28, and the ring bit portion 12 can be integrally rotated,
Moreover, the device unit 66, the inner bit unit 28, the ring bit unit 12 and the excavating pipe 10 can be moved integrally in the soil in the excavating direction. Slime grooves 70 and 72 are also formed in the flange 68 of the device portion 66, and the slime can be removed upward by corresponding to the slime grooves 42 and 44 of the base body 30. An air passage 74, which opens at the upper end and the lower end, is also provided in the center of the device portion 66, and communicates with the air passage 52 of the base body 30.

Next, the operation will be described with reference to FIGS. 1 and 3.

In the state shown in FIG.
When is hit, the device unit 66 moves downward while rotating. Then, in the inner bit portion 28, the bits 58 ... Move downward while excavating the earth and sand, so that the excavated earth and sand enters the inner cylinder 36.

On the other hand, since the bit 18 of the ring bit unit 12 also rotates at the same time and moves downward, the drill pipe 10 moves downward. The earth and sand excavated by the ring bit part 12 are slime grooves 42, 44, 70, 72.
It is eliminated in the direction of arrow A through.

After excavating the inner cylinder 36 or the cylinder 34 until the sample soil is filled, the device section 66 and the inner bit section 28
By pulling up (state of FIG. 3), the inner cylinder 36 containing the sample earth and sand 76 can be obtained.

After pulling up, if the tubular body 34 is removed from the connecting body 32, the inner tube 36 containing the sample earth and sand 76 can be taken out. The inner cylinder 36 is not always necessary, and in that case, the sample earth and sand 76 will be collected in the cylinder 34.

Again, in order to collect a sample, attach the cylinder 34 with the new inner cylinder 36 set to the inner bit part 28, and insert the device part 66 and the inner bit part 28 into the drill pipe 10 and the inner bit part 28 will collect the sample. It can be sent unconditionally up to the sampling depth. Although the inner wall surface of the excavation hole 78 excavated by the inner bit part 28 may collapse when the inner bit part 28 is pulled up or sent, this does not hinder sampling because the length of the inner bit part 28 is around 1 m. .

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and many modifications can be made without departing from the spirit of the present invention. Is.

(Effects of the invention) By using the excavation device for geological survey according to the present invention, it is of course possible to suppress the collapse of the inner wall surface of the already excavated hole when taking out the sample earth and sand to the extent that it does not hinder the sampling. The ring bit part and the inner bit part can rotate and move in the excavating direction at the same time. Moreover, since a plurality of excavation bits are fixed around the opening of the excavation side end surface of the flange radially extended to the excavation side end section of the ring bit section and the excavation side end surface of the inner bit section, Since it is possible to dig while excavating the sand with the work bit, it is possible to dig the drill pipe and the inner bit part for sampling at the same time, and surely dig with the drill bit fixed to the flange and the inner bit part. It is possible to proceed and efficient excavation work can be performed with one drive means. Further, if the structure of claim 2 is adopted, if the inner bit is pulled out, the inner cylinder is taken out, and a substitute inner cylinder is set, it is immediately involved in the next excavation and more efficient work is possible. Play.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of excavating using the excavating device of the present invention, FIG. 2 is a perspective view of a ring bit and a collar component member, and FIG. 3 is an inner bit portion from a ring bit portion. Sectional drawing which shows the state which pulls out is shown, respectively. 10 …… Drill pipe, 12 …… Ring bit part, 16 …… Flange, 18 …… Bit, 28 …… Inner bit part, 36… Inner cylinder 40… Center hole, 54… Air hammer, 56… Opening Part, 58 …… bit, 66 …… device part.

Claims (2)

[Claims] 1. An excavating pipe, which is formed in a ring shape, and a device portion that advances in the excavating direction while rotating in the excavating pipe via a driving means, and excavates the excavating pipe so as to move with the excavating pipe. When the side end is rotatably arranged with the same axis as the excavating pipe, is in contact with the excavating side end of the excavating pipe, and is engageable with and disengageable from the device portion, and engages with the device portion. Has a ring bit part that can rotate and move integrally with the device part, and a cylindrical shape with an opening on the end face on the excavation side, which can be inserted into the center hole of the ring bit part and is opposite to the excavation side. In the excavation device for geological survey, the end portion on the side is connected to the device portion, and an inner bit portion that can rotate and move integrally with the device portion is provided. Extended A protruding flange is formed, a plurality of excavating bits are fixed to the excavating side end surface of the flange, and a plurality of excavating bits are fixed to the excavating side end surface of the inner bit part around the opening. A drilling rig for geological surveys characterized by being used. 2. The excavation device for geological survey according to claim 1, wherein an inner cylinder for sampling, which has an opening at least on the end face on the excavation side, is arranged in the inner bit part.