JPH0743261Y2 - Ground excavator orientation correction head - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention is a direction correction head located at the head of a ground excavator and defining a traveling direction by excavation, and can be particularly effectively used for non-excavation ground excavation. Regarding technology that can be done.

[0002]

[Prior Art and its Problems] Conventionally, when performing plumbing work for water, gas, etc., for example, a starting shaft and a reaching shaft are dug at a specific location on a road, and a ground excavator is installed in the starting shaft. The ground will be excavated from the side wall of the starting shaft, and the ground excavation will be carried out by a non-opening method that forms a tunnel line for piping from the starting shaft to the reaching shaft. Such an excavation method has an advantage that a space for occupying a road or the like is small at the time of construction, but has a disadvantage that the traveling direction of the excavation needs to be corrected in a timely manner because the excavation is in a blind state.

Therefore, the ground excavator used for this purpose is usually provided with some direction correcting means. The conventional direction correcting means (a) is a type that changes the direction of the direction correcting head located at the head of the ground excavator with respect to the axis of the shaft portion on the excavator side independently of the shaft portion (for example, the actual opening 62). -1
No. 33787), and (b) a direction correcting head that integrally changes the direction with the shaft portion on the excavator side (see, for example, Japanese Utility Model Laid-Open No. 3-62187). When comparing the two, the former type is easy to correct the direction because the head itself changes direction independently, whereas the latter type is easier to correct the direction because the head is integral with the shaft. Has some drawbacks. However, the former type requires a mechanism for correcting the direction between the head and the shaft portion, so that the structure is complicated and the cost is disadvantageous. In that respect, the latter one has a simple structure and is advantageous in terms of cost.

The inventor of this application focused on the latter type of direction correcting head and attempted to improve it. As shown in FIG. 4, the conventional head 30 of this type has a tip portion 32 formed by obliquely cutting a cylinder, which causes some problems due to the characteristics of the shape. The first problem is that for the head 30,
Unbalanced force (ground reaction force) is always applied, and therefore not only the head but also the body of the excavator is overwhelmed. The second problem is that when the head 30 rotates, the tip moves between XY.
The possibility of meandering is high. In particular, this problem is remarkable in an impact type excavator. Further, the third problem is that when the head 30 is strongly pressed against the ground, the head 30 bends greatly, so that the insertion force or the penetration force is limited, so that the applicable ground is narrow.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and is to be applied effectively to excavation of various types of ground without sacrificing the advantages in terms of cost and with less meandering. The purpose is to provide the technology that can.

[0006]

[Means and action therefor] The direction correcting head of the present invention has a tip end facing the ground which is a pyramidal shape, and
Basically, it has the following structural features. A. The center of the tip with the smallest diameter is located on the axis of the mounting portion for mounting on the excavator side. B. A plurality of grooves along the axial direction are provided on the peripheral side portion of the conical shape. C. When the tip portion is bisected by the plane including the axis, the surface area on one side of the bisector is larger than that on the other side. Then, as an additional feature, it has either the following configuration D or D ', and thereby the correction direction is defined. D. By providing the plurality of grooves by concentrating them on the conical tip portion, the direction is corrected to the side opposite to the side where the grooves are located. D '. The groove at the tip of the conical shape communicates with the rear end of the direction correcting head through the escape groove provided in the mounting portion, and by removing the earth and sand of the ground to be excavated through the groove and the escape groove, Correct the direction to the grooved side. Due to these features, various grounds can be effectively excavated while having an effective direction correction function and less meandering.

[0007]

1 is a side view of a direction correcting head 10 according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line 2-2 of FIG. The direction correcting head 10 integrally includes a substantially conical tip portion 12 and a mounting portion 14 that follows the tip portion 12. The tip portion 12 is a side facing the ground to be excavated, and the attachment portion 14 is a portion for attaching to the head of a shaft portion such as an auger or a screw of an excavator. At the time of mounting, the axis of the shaft portion on the excavator side and the axis of the mounting portion 14 should be aligned.

The tip portion 12 has the smallest diameter at the tip portion 11, and the portion 11 is located at the center of the head 10, in other words, on the axis of the mounting portion 14. Further, the tip portion 12 has a plurality of grooves 20 on its peripheral side surface along the axial direction. Each groove 20 extends from the tip portion 11 to the end of the inclined surface or a position beyond the end. It should be noted here that those grooves 20 are arranged only on one side on the inclined surface of the tip portion 12. Therefore, the tip 1
Considering the surface area of 2, the surface area on the side including the groove 20 is much larger than that on the other side without the groove, as can be easily seen from the sectional view of FIG. Therefore, when the head 10 is pushed into the ground and inserted without being rotated, the head 10 receives a larger ground reaction force on the side having a larger surface area. The bias of the ground reaction force makes it possible to correct the direction of the head 10.
That is, as shown in FIG. 1, when the force of the arrow P in the axial direction is applied to the head 10, the head 10 corrects the direction as indicated by the arrow L due to the bias of the ground reaction force.

The size of the groove 20 of the tip portion 12 can be appropriately set according to the type of ground. In some cases, a plurality of heads having different groove shapes and sizes may be prepared in advance, and an appropriate head may be used according to the geology of the ground to be excavated.

In the direction correcting head 10 as described above, the thrust force during excavation is always concentrated on the tip portion 11 located at the center of the tip portion 12, so that the direction of penetration is defined as a fixed direction, and its variation is small. Therefore, there is little meandering, and it can be effectively applied to an impact type excavator. Moreover,
Since the groove 20 serves as a passage for excavated soil, the resistance to the tip portion 12 is reduced and the penetration force can be increased.

FIG. 3 is a side view of the direction correcting head 100 according to the second embodiment of the present invention. The direction correcting head 100 here includes a clearance groove 120 in addition to the head 10 of the first embodiment. Escape groove 120
Are provided in the same number as the grooves 20 in the conical tip portion 12, and each groove 20 is extended in the axial direction, and the grooves 20 and the escape grooves 120 are connected or continuous with each other. The direction correcting head 100 performs the direction correction in the direction opposite to the direction correcting head 10 of the first embodiment when the grooves 20 are at the same position. That is, as shown in FIG. 3, when the force of the arrow P in the axial direction is applied to the head 100, the head 100 corrects the direction as indicated by the arrow R. this is,
This is because the excavated soil is more smoothly transmitted to the rear end of the head 100 through the groove 20 and the subsequent escape groove 120 on the side where the escape groove 120 is present, as compared with the opposite side, and as a result, The direction is corrected in the direction opposite to that of the head 10 of the first embodiment. The second direction correcting head 100 exhibits a larger propulsion property than the first head 10, and is thus suitable for the ground requiring a large propulsion property.

In each embodiment shown in the drawings, the tip portion 12
Although the groove 20 is provided only on one side of the above, the groove may be arranged over the entire circumference of the tip portion 12. In that case, the size of the surface area should be set appropriately by making the groove of one part larger than that of the other part, or by changing the distribution density of the groove. Further, in each of the embodiments shown in the drawings, the tip portion 12 has a conical shape, but the shape may be another pyramid shape such as a pyramid. Further, the groove 20 may have a linear shape or another shape such as a spiral shape.

[0013]

As described above, according to the present invention, the head 1
The tip portion 12 of 0 has a pyramidal shape, and the tip portion 11 is arranged on the axis of the mounting portion 14. Further, by providing a plurality of grooves 20 on the circumferential side of the tip portion 12, the tip portion 12 Since the surface area of the ground is biased, it can be widely applied to various types of ground by increasing the penetration force while effectively providing the function of correcting the direction.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a side view showing a second embodiment of the present invention.

FIG. 4 is a side view showing a conventional head of this type.

[Explanation of symbols]

 10,100 Direction correction head 11 Tip part 12 Tip part 14 Mounting part 20 Groove 120 Escape groove

Claims (3)

[Scope of utility model registration request] 1. A direction-correcting head that is located at the head of a ground excavator and defines a traveling direction by excavation, and has a cone-shaped tip that faces the ground to be excavated, and a shaft-shaped tip that follows the tip. And a mounting portion, and the tip end of the conical shape is configured as shown in the following A, B , C and D. A. The center of the tip with the smallest diameter is located on the axis of the mounting portion. B. A plurality of grooves along the axial direction are provided on the peripheral side portion of the conical shape. C. When the tip portion is bisected by the plane including the axis, the surface area on one side of the bisector is larger than that on the other side. D. The plurality of grooves are provided so as to be concentrated on the tip of the conical shape.
By correcting, the direction is corrected to the side opposite to the side with the groove.
To do. 2. The direction correcting head for a ground excavator according to claim 1, wherein the plurality of grooves are provided on only one side of the bisected portion. 3. It is located at the head of the ground excavator and is excavated.
A direction correction head that regulates the direction of travel,
Continuing with a cone-shaped tip facing the ground and the tip
With a shaft-shaped mounting portion, the conical tip portion is
Ground excavation configured as A, B, C and D '
A direction correction head for a shaving machine. A. The center of the smallest diameter tip should be on the axis of the mounting part.
To position. B. A plurality of grooves along the axial direction are formed on the peripheral side portion of the cone shape.
is there. C. If the tip portion is bisected by a plane including the axis.
The surface area on one side is greater than that on the other side.
large. D '. The conical groove at the tip is provided in the mounting portion.
Contact the rear end of the direction correction head through the relief groove
Of the ground to be excavated through the ditches and relief ditch
Correct the direction to the grooved side by removing the sand
To do.