JP2001271590A - Jacking pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jacking pipe capable of suppressing a turning force transmitted to the jacking pipe. SOLUTION: As a means for solving the problem described above, the jacking pipe to be jacked without rotation has projections on the outer peripheral surface thereby suppressing the turning force of the jacking pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion pipe for propelling underground without rotating.

[0002]

In tunnel excavation and the like, it has been known to implement a long end receiving method or a pipe roof method, which is an example of an earth retaining method, in order to prevent collapse of a fragile ground in front of and above a face. I have. In these construction methods, a method of arranging a short divided steel pipe to a predetermined depth while connecting the steel pipes is widely known. As a method for arranging the steel pipe in the ground, a known double-pipe excavation tool for drilling a ground, a rock or the like as shown in FIG. 2 is used.

This tool has a ring bit c via a top joint b at the tip of an outer propulsion pipe a disposed in the ground.
Is mounted, and an inner bit e is mounted on the tip of an inner pipe d arranged in the propulsion pipe a, and the excavation is performed by transmitting the rotational force and the impact force of the inner pipe d to the inner bit e and the ring bit c. It is configured. After excavating to the predetermined depth, the inner pipe d is pulled out together with the inner bit e, and the ring bit c,
The top joint b and the propulsion pipe d are left underground.

Here, the impact force of the inner pipe d is such that the impact surface e2 of the impact member e1 of the inner bit e is
Is transmitted to the propulsion pipe a by hitting the receiving surface b1 of the propulsion pipe. This striking force generates a propulsion force of the propulsion pipe a that continues rearward into the ground.

At this time, the rotational force of the inner pipe d is basically not transmitted to the top joint b and the propulsion pipe a, because the ring bit c can rotate and slide with respect to the top joint b. However, in practice, some rotational force is transmitted due to the mechanism. Therefore, when the connecting portion between the propulsion tube a and the top joint b or the connecting portion between the propulsion tubes a has a screw structure, the screw portion f may be loosened or damaged. Therefore, there is a possibility that the propulsion of the propulsion pipe a into the ground becomes difficult.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a propulsion pipe capable of suppressing a rotational force transmitted to the propulsion pipe.

[0007]

According to the present invention, there is provided a propulsion pipe for propelling underground without rotating the propulsion pipe, wherein a projection is provided on an outer peripheral surface of the propulsion pipe. Provided is a propulsion pipe characterized in that it is configured to suppress rotational force.

Further, a digging means is provided at the tip of a double pipe consisting of an inner pipe and a propulsion pipe on the outer side thereof, and digging is performed by the rotating force and impact force of the inner pipe. In a propulsion pipe used for a double-pipe excavating tool configured to strike a receiving surface provided on the inner peripheral surface on the propulsion pipe side with a striking face and transmit a striking force of a striking member to the propulsion pipe side, A propulsion pipe characterized in that a projection is provided on the outer peripheral surface of the propulsion pipe to suppress the rotational force of the propulsion pipe.

Further, in the above-mentioned propulsion pipe, there is provided a propulsion pipe characterized in that a tip of the projection in a propulsion direction is formed in a tapered shape.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the present embodiment, a double-pipe excavating tool will be described as an example. However, the present invention can be applied to any pipe that is propelled into the ground without rotating.

<A> Propulsion Pipe The propulsion pipe 1 according to the present embodiment is used as an outer pipe of the known double-pipe excavation tool described in the above-mentioned prior art. The double-pipe drilling tool attaches a bit 3 to the tip of the propulsion pipe 1 via a top joint 2,
In the structure, the propulsion pipe 1 is connected to the inner pipe 4 via a joint member and a striking member (not shown).

Further, the propulsion pipe 1 of the present embodiment is a case where a connection portion with the top joint 2 or a connection portion between the propulsion tubes 1 has a screw structure 11.

The excavation is performed by the rotational force and the striking force of the inner pipe 4. The striking force of the inner pipe 4 is transmitted from a striking member (not shown) to the top joint 2, and the propulsion pipe 1 is continuously connected to the rear.
Propulsion into the ground is generated.

On the other hand, the rotational force of the inner pipe 4 is basically not transmitted to the top joint 2 and the propulsion pipe 1. However, in practice, some rotational force is transmitted due to the mechanism. For this reason, the connection between the propulsion pipe 1 and the top joint 2 or the connection between the propulsion pipes 1 may cause the screw structure 11 to be loosened or damaged.

<B> Projection A projection 5 is provided on the outer peripheral surface of the propulsion pipe 1. Further, since the top joint 2 is also a kind of propulsion pipe, the protrusion 5 may be provided on the outer peripheral surface thereof.

In the present embodiment, elongated projections 5 made of steel are welded or integrally formed in the axial direction of the outer peripheral surfaces of the propulsion pipe 1 and the top joint 2 and are formed at four locations at equal intervals in the circumferential direction. It is a case where it is provided.

At the tip of the projection 5 in the propulsion direction, a tapered portion 51 is formed to reduce the propulsion resistance.

By providing such a projection 5,
Since the rotation resistance of the propulsion pipe 1 and the top joint 2 in the soil is suppressed, the rotation force transmitted from the inner pipe 4 can be suppressed.

Therefore, it is possible to attenuate the rotational torque generated at the connecting portion of the screw structure 11, and it is possible to prevent the connecting portion from being loosened or damaged. In addition, the propulsion accuracy of the propulsion pipe 1 can be increased, and the drilling can be prevented from being bent.

The shape, dimensions, number of circumferential arrangements, number of axial arrangements, etc. of the projections 5 are appropriately selected in consideration of various conditions such as the dimensions of the propulsion pipe 1 and the properties of the construction ground.

[0021]

Since the present invention is as described above, the following effects can be obtained. <B> Since the protrusion is provided on the outer peripheral surface of the propulsion pipe, the rotational force transmitted to the propulsion pipe can be suppressed. Therefore, even if the connecting portion between the propulsion tube and the top joint or the connecting portion between the propulsion tubes has a screw structure, the screw portion does not loosen or break. Therefore, the propulsion pipe can be favorably propelled into the ground.

<B> The protrusions can improve the propulsion accuracy of the propulsion pipe and prevent drilling and bending.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional technique.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Katsuhiro Kusano, Inventor Katsuhiro 1-12-14 Kudankita, Chiyoda-ku, Tokyo Shio Kogyo Co., Ltd. F-term (reference) 2D054 AC18 AD27 BA24

Claims (3)

[Claims] 1. A propulsion pipe for propelling underground or the like without rotating it, wherein a projection is provided on an outer peripheral surface of the propulsion pipe so as to suppress a rotational force of the propulsion pipe. 2. A digging means is provided at the tip of a double pipe comprising an inner pipe and a propulsion pipe on the outer side thereof, and digging is performed by the rotating force and the impact force of the inner pipe. In a propulsion pipe used for a double-pipe excavating tool configured to strike a receiving surface provided on an inner peripheral surface on the propulsion pipe side with a striking face and transmit a striking force of a striking member to the propulsion pipe side, A propulsion pipe characterized in that a projection is provided on an outer peripheral surface of the propulsion pipe to suppress a rotational force of the propulsion pipe. 3. The propulsion pipe according to claim 1, wherein a tip of the projection in a propulsion direction is formed in a tapered shape.