JPH11117655A - Excavating device for geological survey - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily conduct an exact geological survey. SOLUTION: This device is provided with a device part 12 rotated and advanced in an excavating direction by being struck with an air hammer 36 inside an excavation pipe 10; a cylindrical bit part 16 which is a rotatably disposed cylindrical body provided with a plurality of excavating bits 14, 14 on its excavation-side ring-shaped end face and provided with the welding part of a notched part 26 and the excavation pipe 10 at its end facing the device part 12, the notched part 26 being freely removably irregularly engaged with a projecting part 24 provided at the device part 12; and a sampling inner cylinder 20 which is a cylindrical body connected to the device part 12 by a connection 18 and freely removably inserted into the cylindrical bit part 16 in such a manner that an opening in its end is located at a predetermined position inside the cylindrical bit part 16 facing an opening in the excavation-side ring- shaped end face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geological survey excavator, and more particularly, to a geological survey excavator for sampling a sample such as earth and sand for a geological survey.

[0002]

2. Description of the Related Art When constructing buildings such as roads, bridges, and buildings, a geological survey of a planned construction site is often performed in advance. The present inventor has previously proposed a geological survey excavator shown in FIG. 4 in Japanese Patent Application No. 2-243060 as a geological survey excavator used for such a geological survey. The drilling device for geological survey shown in FIG.
A device section 104 which advances in the excavation direction while rotating via an air hammer 102 in the inside of 00, and a plurality of excavation bits 106 are fixed to a ring-shaped excavation side end face, and connected to the excavation pipe 100 to rotate. A ring bit portion 108 which is disposed so as to be capable of being detachably engaged with the device portion 104, and a plurality of excavation bits 108 are fixed around an opening provided on the excavation side end face. An inner bit portion 110 including a tubular member 109 having an end opposite to the excavation side connected to the device portion 104;
And an inner cylinder 112 for sampling which is provided in the inner bit portion 110 and has an opening at the end face on the digging side.

[0003]

According to the geological survey excavator shown in FIG.
By hitting 4, the device unit 104 moves downward while rotating. For this reason, the inner bit 110 connected to the device 104 is
08, the soil and the like move downward while excavating the soil and the like, so that a sample of the soil and the like at a predetermined depth enters the inner cylinder 112 for sampling. At the same time, the ring bit portion 108 detachably engaged with the device portion 104 can also move downward while excavating earth and sand by the excavation bit 106, and the excavation pipe 100 moves downward together with the ring bit portion 108. it can. Next, the inner cylinder 1 for sampling
When the excavation of the device section 104 by the air hammer 102 was stopped and the device section 104 and the inner bit section 110 were pulled up when the excavation 12 was excavated to the full depth of the sample, the sample 114 was stored as shown in FIG. The inner cylinder 112 can be obtained. Furthermore, this inner cylinder 1
By removing 12 from the device section 104, a core-shaped sample 114 can be obtained. Thereafter, in order to collect a sample again, a new inner cylinder 112 is attached to the inner bit portion 110, and the device portion 104 and the inner bit portion 110 are inserted into the drilling pipe 100, thereby sampling the inner bit portion 110. It can be easily sent to the specified depth.

However, in the geological survey excavator shown in FIGS. 4 and 5, when the inner bit portion 110 is pulled up, the inner wall surface of the excavation hole 116 (FIG. 5) excavated by the inner bit portion 110 collapses. The excavation hole 116 may be filled with earth and sand. In this case, it has been found that the new inner cylinder 112 may be mixed with earth and sand substantially the same as the sample collected last time, and that accurate geological investigation may not be performed. Drilling pipe 1
As shown in FIG. 4, since the inner bit portion 110 smaller than 00 protrudes from the excavation surface of the ring bit portion 108, it was also found that the inner bit portion 110 may be bent. In this case, it is difficult to carry out an accurate geological survey. Therefore, an object of the present invention is to provide a geological survey excavator capable of easily performing an accurate geological survey.

[0005]

In order to solve the above-mentioned problems, the present inventor has proposed that the inner bit portion 110 smaller than the excavation pipe 100 to be lifted and fed into the excavation pipe 100 be replaced with the ring bit portion 108. As a result of repeated investigations considering that a device capable of sampling without protruding from the end face on the excavation side is effective, the present invention has been reached.
That is, the present invention is directed to a device portion that advances in the excavation direction while rotating through a driving means in a drilling pipe, and a rotatably disposed cylindrical body, and a plurality of ring-shaped end surfaces on the excavation side. A tubular bit portion provided with an excavation bit, and an engagement portion that is removably engaged with the device portion and a connection portion with the excavation pipe provided at an end on the device portion side; And a cylindrical body connected by a connecting portion with the device portion, such that a tip opening is located at a predetermined position in a cylindrical bit portion facing an opening of the ring-shaped end surface on the digging side, An excavator for a geological survey, comprising: an inner cylinder for sampling, which is removably inserted into a cylindrical bit portion.

In the present invention, the engagement between the device portion and the cylindrical bit portion is performed by uneven engagement, so that the structure of the engagement portion can be simplified. Also, a stopper is provided at a predetermined position in the tubular bit portion so that when the inner tube for sampling is inserted into the tubular bit portion, the tip of the inner tube does not protrude from the excavation side end face of the tubular bit portion. Thus, the inner cylinder for sampling can be reliably inserted into a predetermined position in the cylindrical bit portion. Further, by providing a connecting portion for connecting both members of the device portion and the inner tube for sampling to a connecting portion for connecting both members without transmitting the rotation of the device portion to the inner tube for sampling. In addition, the inner cylinder inserted into the cylindrical bit portion can be kept in a non-rotating state, and the core-shaped sample core collected in the inner cylinder can be prevented from being broken.

According to the geological survey device of the present invention, the device that engages with the cylindrical bit portion into which the inner cylinder for sampling is inserted without protruding from the end surface on the excavation side is driven, and the cylindrical bit is driven. The excavation hole is excavated by the excavation bit provided on the ring-shaped end face on the excavation side of the part. The sample excavated by such excavation is stored in an inner cylinder for sampling. Next, when the inner cylinder for sampling is excavated to a depth that is full of the sample, the driving of the device unit is stopped to suspend the excavation, and the device unit and the inner cylinder for sampling are extracted from the excavation pipe. Thus, it is possible to obtain an inner cylinder for sampling which is full of the sample. At this time, since the wall surface of the drill hole is guarded by the outer peripheral wall of the cylindrical bit portion, even if the inner tube for sampling is pulled out from the cylindrical bit portion, the wall surface of the drill hole collapses and the drill hole is formed. There is no filling. After that, an empty inner cylinder for sampling the sample is attached to the device part, the inner cylinder for sampling is inserted into the cylindrical bit part, and the excavation by the cylindrical bit part is resumed. A new hole can be drilled following the already drilled hole.
For this reason, the sample stored in the sample collection inner cylinder is a newly excavated portion, and it is possible to substantially prevent the earth and sand and the like in the already excavated portion from being mixed. In addition, since the cylindrical bit part provided with the drill bit on the excavation side end face is usually formed with a higher strength than the inner cylinder for sampling, it is possible to prevent bending etc. during excavation. it can.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a geological survey excavator according to the present invention. The drilling device for geological investigation shown in FIG. 1 includes a device portion 12 that rotates in a drilling pipe 10 by being hit by an air hammer 36 and moves in a drilling direction, and a plurality of drilling bits 14, 14. Is fixed, and is rotatably disposed by being welded to the excavation pipe 10 and is engaged with the device portion 12 by a tubular bit portion 16, and by the device portion 12 and the connecting portion 18. And a sample collecting inner cylinder 20 which is connected to and is removably inserted into the cylindrical bit portion 16. The excavation pipe 10 has an outer diameter of a cylindrical bit portion 16.
And the lower end thereof is welded to a step formed at the upper end of the cylindrical portion 30. Further, a flange portion 22 is provided in the middle of the device portion 12, and abuts on an upper end surface of the tubular portion 30,
The thrust of the device 12 in the excavation direction is applied to the cylindrical bit 1
To 6. Furthermore, the flange portion 22 of the device portion 12
A projection 24 is formed below the projection, and engages with a notch 26 formed in a small-diameter portion 28 having a smaller diameter than the main body of the cylindrical portion 30 with the step of the cylindrical portion 30 as a boundary. The torque of the device section 12 is transmitted to the cylindrical bit section 16.

At the end of the tubular portion 30 of the tubular bit portion 16 at the excavation side, a ring bit portion 32 having a plurality of excavation bits 14, 14,.
Is screwed. An end surface 34 formed at the lower end of the screw portion of the ring bit portion 32 is in contact with the excavation-side end surface of the tubular portion 30, and is provided with an air hammer 36 that applies a rotational force and a propulsive force in the excavation direction to the device portion 12. This is the end face that receives the impact. As described above, in the excavator shown in FIG. 1, since the impact due to the beating of the air hammer 36 and the like is received by the cylindrical portion 30 and the ring bit portion 32, the inner cylinder 20 for sampling that is inserted into the cylindrical portion 30. In this case, no impact force is applied by the air hammer 36 or the like, so that the inner cylinder 20 can be prevented from being bent during excavation. Further, in the through hole of the ring bit portion 32, a through hole 4 having a larger inner diameter than the through hole 38 on the digging side and into which the digging side end of the inner cylinder 20 for sampling is inserted.
0 is formed. A step surface 42 is formed at the boundary between the two through holes 38 and 40, and the end surface of the inner cylinder 20 on the excavation side is in contact with the step surface 42. The step surface 42 is a stop bar portion for reliably preventing the front end opening of the inner cylinder 20 from protruding from the ring-shaped end surface of the ring bit portion 32.

An inner cylinder 20 for sampling, which is inserted into the cylindrical bit section 16, is connected to the device section 12 and the connecting section 1
8 are connected. As shown in FIG. 2, the other end of the connecting rod 44 having one end screwed to the device unit 12 is inserted into the inner cylinder side connecting part 46 attached to the upper end of the inner cylinder 20 as shown in FIG. Have been. The inner cylinder side connecting portion 4
6 is a cylinder 50 screwed to a lid 48 screwed to the upper end of the inner cylinder 20, and a flange provided at the other end of the connecting rod 44 inserted into the cylinder 50. 52, and a pair of thrust bearings 54, 54 disposed so as to sandwich the flange 52. Thus, FIG.
Even when the device portion 12 rotates, only the flange portion 52 of the connection rod 44 rotates, and the inner cylinder 20 can be connected to the device portion 12 in a non-rotating state. In FIG. 2, one end of the connecting rod 44 is screwed to the lid 48, and a flange 52 provided at the other end of the connecting rod 44 is inserted into the device section 12, and the flange 52 is inserted into the device 12. It may be sandwiched between the thrust bearings 54 provided in the portion 12.

An air vent hole 58 for discharging air from the inner cylinder 20 is formed on an inner wall surface of a concave portion 56 which is opened at an inner cylinder side end surface of a lid portion 48 screwed to an upper end portion of the inner cylinder 12 shown in FIG. One of the openings is open. The other opening of the air vent hole 58 is opened on the outer peripheral surface of the lid 48. Furthermore, the notch 60
Is formed to form an air vent hole 62. The air vent hole 62 is connected to an air vent path 64 formed at the center of the device section 12. For this reason, the inner cylinder 20
The air in the inside is exhausted from an air vent hole 58 formed in the lid portion 48, and flows into the excavation pipe 10 through an air vent passage 64 from an air vent hole 62 of a notch portion 60 formed in the flange portion 22 of the device portion 12. Is discharged.

In the excavator for geological survey shown in FIG. 1, by pushing the device portion 12 in the excavation direction, the flange portion 22 of the device portion 12 is turned into the cylindrical portion of the cylindrical bit portion 16 as shown in FIG. The protrusion 24 provided below the flange 22 and abutting against the upper end surface of the cylindrical portion 3
It engages with the notch 26 formed in the small-diameter portion 28 of the zero. At this time, the tip of the inner cylinder 20 for sampling, which is connected to the device section 12 by the connecting section 18, is connected to the ring bit section 32 screwed to the excavation side end of the cylindrical bit section 16.
Of the inner cylinder 20 is inserted into the through hole 40 of the
It is in contact with 2. Therefore, the opening of the distal end of the inner cylinder 20 is located at a predetermined position facing the opening of the through hole 38 of the ring bit portion 32.

In the state shown in FIG.
When the device unit 12 is hit by the
Moves downward while rotating. The flange portion 22 of the device portion 12 is in contact with the projection portion 2 of the device portion 12.
The cylindrical bit portion 16 that is in concave-convex engagement with 4 also moves downward while rotating with the device portion 12. For this reason, the cylindrical bit portion 16 has a plurality of excavating bits 14, 14,... Fixed to the ring-shaped end face of the ring bit portion 32.
As a result, the sample moves downward while excavating earth and sand, and the sample enters the inside of the inner cylinder 20 through the through-hole 38 of the ring bit portion 32 from the opening at the tip end. In the excavator for geological investigation shown in FIGS. 1 to 3, the inner cylinder 20 inserted into the cylindrical bit part 16 is in a non-rotation state even when the device part 12 rotates. In other words, even if the flange portion 22 formed on the other end of the connecting rod 44 that forms the connecting portion 18 and one end of which is screwed to the device portion 12 rotates with the device portion 12, the connecting rod 44 Only the thrust bearings 54, 54 disposed so as to sandwich the flange portion 52 of the above, rotate, and the inner cylinder 20 is held in a non-rotating state. In this manner, by holding the inner cylinder 20 in a non-rotating state, a core-shaped sample stored in the inner cylinder 20 can be collected without breaking.

Next, when the inside of the inner cylinder 20 is excavated to a depth at which the sample is full, the beating of the device section 12 by the air hammer 36 is stopped, and the device section 12 is pulled up from the excavation pipe 10, as shown in FIG. The inner cylinder 20 connected by the connecting portion 18 can also be pulled up. Thereafter, by removing the lifted inner cylinder 20 from the lid 48, the inner cylinder 2 from which a sample of a predetermined depth has been collected is removed.
0 is obtained. Thus, the inner cylinder 20 is connected to the cylindrical bit portion 16.
Even if the excavation hole is pulled up, the excavation hole is surely secured by the cylindrical portion 30 of the cylindrical bit portion 16, so that a situation in which the wall surface of the excavation hole collapses and the excavation hole is buried can be avoided. Therefore, when the new inner cylinder 20 is screwed into the lid 48 and then inserted into the excavation pipe 10 together with the device section 12, the new inner cylinder 20 can be reliably inserted to the depth at which the inner cylinder 20 was previously pulled up, It is possible to prevent a situation such as incorporation of soil and the like at the depth collected last time. The cylindrical portion 30 of the cylindrical bit portion 16
Is formed so as not to be deformed even if it is hit by the device portion 12, and is usually higher in strength than the excavation pipe 10. Therefore, unlike the inner bit portion 110 protruding from the excavation surface of the ring bit portion 108 of the geological survey excavator shown in FIG. Therefore, again, the air hammer 3
By restarting the beating of the device unit 12 by 6, a sample having a depth subsequent to the sample previously collected can be reliably collected in the inner cylinder 20, and an accurate geological survey can be performed.

[0015]

According to the geological survey excavator of the present invention, it is possible to accurately conduct a geological survey of a planned construction site such as a road, and to design a building in which the geology of the planned construction site is sufficiently considered. It is. For this reason, it is possible to construct a building having excellent earthquake resistance and the like.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing an example of a geological survey excavator according to the present invention.

FIG. 2 is a partial cross-sectional view for explaining a structure of a connecting portion 18 shown in FIG.

FIG. 3 is a partial cross-sectional view for explaining an excavation state by the excavation device for geological investigation shown in FIG. 1;

FIG. 4 is a partial cross-sectional view illustrating a conventional excavator for geological survey.

5 shows a conventional geological survey excavator shown in FIG.
FIG. 12 is a partial cross-sectional view for explaining a state in which No. 12 is pulled out.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drilling pipe 12 Device part 14 Drilling bit 16 Cylindrical bit part 18 Connecting part 20 Inner cylinder for sampling 22 Flange part 24 Protrusion part 26 Notch part 30 Cylindrical part 32 Ring bit part

Claims (4)

[Claims] 1. A device section which travels in a direction of excavation while rotating through a driving means in a excavation pipe, and a plurality of excavations are provided on a rotatable tubular body on a ring-shaped end face on the excavation side. Bits are provided,
An engagement portion detachably engaged with the device portion and a connection portion with the excavation pipe connected to a cylindrical bit portion provided at an end portion on the device portion side by the connection portion with the device portion; In the cylindrical body, at a predetermined position in the cylindrical bit portion facing the opening of the ring-shaped end surface on the digging side, so that the tip opening is located,
An excavator for geological investigation, comprising: an inner cylinder for sampling, which is removably inserted into the cylindrical bit portion. 2. The excavation device for geological survey according to claim 1, wherein the engagement between the device portion and the cylindrical bit portion is an uneven engagement. 3. A predetermined position in the cylindrical bit portion so that the tip of the internal tube does not protrude from the excavation side end surface of the cylindrical bit portion when the sample collecting inner cylinder is inserted into the cylindrical bit portion. The excavator for geological investigation according to claim 1 or 2, wherein a stopper portion is provided on the excavator. 4. A connecting part for connecting both members of the device part and the inner cylinder for sample collection is a connecting part for connecting both members without transmitting rotation of the device part to the inner cylinder for sample collection. The geological survey excavator according to any one of claims 1 to 3.