JP2599343Y2 - Cutter head device of small diameter pipe propulsion machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter head device for a small-diameter pipe propulsion machine capable of rock excavation.

[0002]

2. Description of the Related Art Conventionally, a small-diameter pipe propulsion device in which a small-diameter pipe is buried in the ground is buried by propelling a small-diameter pipe having a leading pipe attached to the tip thereof into the ground by a propulsion device installed in a starting shaft. A cutter head for excavating the front face is rotatably provided at the end of the leading pipe. Further, since the conventional cutter head is designed mainly for excavating a gravel layer, as shown in FIG.
A plurality of disk cutters b are rotatably mounted only on the front surface of the disk cutter, and the face is excavated by the disk cutters b with the rotation of the cutter head body a.

[0003]

For this reason, when rock is excavated with a conventional cutter head, the outer periphery of the tunnel cannot be sufficiently excavated with the disk cutter b provided on the front face, and the small-diameter pipe is not excavated. There was a problem that made propulsion difficult. The present invention has been made in order to improve the above-mentioned conventional problems, and an object of the invention is to provide a cutter head device for a small-diameter pipe propulsion machine that enables rock excavation.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides, in order to achieve the above-mentioned object, a front pipe which is attached to the tip of a small-diameter pipe to be buried and which is propelled into the ground. In a cutter head device of a small-diameter pipe propulsion machine in which a cutter head body on which a center disk cutter and a forward-facing disk cutter are mounted is rotatably provided, a truncated conical outer excavation disk cutter for excavating an outer peripheral portion of a tunnel is provided with a cutting edge. Are rotatably provided on the outer peripheral portion of the front surface of the cutter head so that the projecting portion projects forward from the cutter head.

[0005] Since the disk cutter for outer peripheral excavation has a frusto-conical shape, by devising the inclination angle and the angle of the cutting edge,
The layout can be made so that the relationship between the outer peripheral excavating disk cutter and the cutting edge position of the front disk cutter is the most desirable position. Therefore, according to the present invention, the outer peripheral portion of the tunnel can be sufficiently excavated even in the bedrock layer, so that the promotion of the small-diameter pipe does not become difficult. Since the wear of each disk cutter can be reduced as compared with the case where the cutter head is used for rock excavation, the excavation distance can be greatly increased.

[0006]

An embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. 2 is a front view of the cutter head main body, FIG. 3 is a sectional view of the same, and FIG. 4 is a plan view of a disk cutter for outer peripheral excavation.

In these figures, reference numeral 1 denotes a cutter head main body rotatably provided at the tip of a not-shown front conduit, and a plurality of central disk cutters 2 are supported at the center of the front surface in a linear and rotatable manner.

A pair of disk cutters 3 and 4 are rotatably mounted on outer peripheral portions opposed to each other with the central disk cutter 2 interposed therebetween. One of the disk cutters 3, 4 is a forward-facing disk cutter similar to the conventional one, and has a shape in which a plurality of ridges 3b are protruded from an outer peripheral surface of a tapered body 3a. The tip is the cutter head body 1
The front disk cutter 3 is rotatably supported by a fixed shaft 5 via a bearing 6 so as to be parallel to the front surface of the disk cutter 3.
And the center disk cutter 2 and the cutter head body 1
The front face is excavated.

On the other hand, the other disk cutter 4 is a disk cutter for outer peripheral excavation. For example, two protruding ridges 4b are protrudingly provided on the large diameter outer peripheral portion of the frusto-conical tapered body 4a. 4b is supported on a fixed shaft 7 via a bearing 8 so that the tip of 4b is parallel to the outer peripheral surface of the cutter head main body 1 and protrudes slightly outward from the outer peripheral surface. Even if 3b is worn, ridge 4b
Is set back more than the allowable wear amount L of the forward-facing disk cutter 3 so as not to protrude forward.

As shown in FIGS. 2 and 4, side scrapers 9 and 10 are provided on both sides of the front and outer peripheral sides of the outer peripheral excavating disk cutter 4 so that the cutting edges 9a and 10a face the outer peripheral excavating disk cutter 4 side. The head body 1 is attached to the front surface and the outer peripheral surface, respectively.

Next, the operation when the rock mass is excavated by the cutter head body 1 will be described. While the cutter head main body 1 is rotated by a cutter head motor (both not shown) in a leading pipe attached to the tip of a small diameter pipe (not shown) to be buried, the small diameter pipe is propelled into the ground. While excavating, the face is excavated by the center disk cutter 2 and the forward-facing disk cutter 3 provided on the front surface of the cutter head body 1 as in the conventional case.

The outer peripheral disc cutter 4 excavates the outer periphery of the tunnel 10 as shown in FIG. 5, so that the diameter of the tunnel through which the cutter head body 1 can pass can be ensured. Propulsion of the pipe is not difficult.

The mounting angle θ of the outer peripheral excavating disc cutter 4 is optimally in the range of 45 ° to 75 ° with respect to the center line of the tunnel 10. The blade edge of the disk cutter 4 is L (about 10 to 50 m) behind the blade edge of the disk cutter 3.
m). (See FIG. 3) In the above embodiment, one outer peripheral excavating disk cutter 4 is provided. However, a plurality of outer peripheral excavating disk cutters may be provided according to the diameter of the tunnel 10.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a conventional cutter head.

FIG. 2 is a front view showing a cutter head device of the small-diameter pipe propulsion device according to one embodiment of the present invention.

FIG. 3 is a sectional view showing a cutter head device of the small-diameter pipe propulsion device according to one embodiment of the present invention.

FIG. 4 is a view from arrow A in FIG. 3;

FIG. 5 is an operation explanatory view of the cutter head device of the small-diameter pipe propulsion device according to one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 cutter head main body 2 center disk cutter 3 forward-facing disk cutter 4 outer peripheral excavation disk cutter

Claims (2)

(57) [Scope of request for utility model registration] 1. A cutter having a central disk cutter (2) and a forward-facing disk cutter (3) mounted on the front thereof at the front of a forward conduit mounted on the tip of a small-diameter pipe to be buried and propelled into the ground. Outer perimeter of tunnel in cutter head device of small diameter pipe propulsion machine with head body (1) rotatably provided
Truncated conical outer peripheral drilling disc cutter
(4) The cutting edge is located forward of the cutter head body (1).
So that the front edge of the cutter head (1)
And a cutter head device for a small-diameter pipe propulsion device that is rotatably provided. 2. A plurality of ridges are provided on the outer periphery of the large diameter side of the frusto-conical tapered body (4a) of the disk cutter (4) .
(4b) projecting a projecting strip the tip of (4b) is adapted to protruding parallel to the outer circumference of the cutter head body (1) from the outer peripheral surface of the cutter head body (1), according to claim 1 A cutter head device for a small-diameter pipe propulsion device as described in the above.