JP2542328B2 - Receiving pilot tube - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digging machine having a digging mechanism at its tip and a pilot pipe connected to the digging machine after the digging machine is pushed by a former push jack equipped in the starting shaft to be buried up to the reaching shaft. The present invention relates to a receiving pilot pipe of a two-step propulsion method in which the rear end of the pilot pipe on the starting shaft side and the buried main pipe are connected and replaced.

[0002]

2. Description of the Related Art Recently, in propulsion methods, there are many cases of propulsion burial by muddy water method, earth pressure method and mechanical auger method, and propulsion extension tends to be long distance, especially for small diameter pipe propulsion. Since it is not possible to install a propulsion force dispersion device such as an intermediate pushing device, it is difficult to secure the necessary propulsion force in the buried main.

Therefore, before laying the buried main pipe, the required propulsion force is secured by the cylindrical pilot pipe made of a relatively strong steel material to complete the propulsion burying, and then the rear end of the pilot pipe is laid. The two-step propulsion method, in which the buried main is replaced with the buried main, is often used.

Conventionally, as a method of connecting a pilot pipe, a structure in which a flange portion provided on an end face of the pilot pipe is tightly connected and fixed by a plurality of bolts and nuts is often adopted.

[0005]

With the pilot pipe of the two-step propulsion method described above, a large propulsion force can be secured and long-distance propulsion is possible. And according to the conventional connecting method of the pilot pipe, the excavator at the tip and each pilot pipe are tightly connected with each other by bolts and nuts, etc., so that the structure is integrated, so rolling by rotation of the excavator face plate Can also be prevented.

However, since the pilot pipes are fixedly connected by bolts and nuts, if an error occurs in the direction of the excavator at the tip during propulsion of the pilot pipe, the direction correcting jack in the excavator is operated to operate the excavator. It deflects and corrects for errors, but the pilot tube does not follow the machine because the trailing pilot tube is fixedly attached and integrated. For this reason, it is the current situation that it is very difficult to correct the direction of the excavator, or it becomes impossible to correct the direction, resulting in deterioration of propulsion accuracy.

In order to solve the above-mentioned problems, if the connecting method of the pilot pipe is set to a receiving type bendable method which is used in the conventional Hume pipe joint, etc., it follows the excavator which has the above-mentioned problems. However, there is a problem of rolling due to the rotation of the excavator face plate.

In view of the above problems of the prior art, the present invention provides a receiving pilot pipe that reliably follows the excavator even during pilot pipe propulsion and prevents rolling due to rotation of the excavator face plate. is there.

[0009]

According to the present invention, a collar having an outer shell extended at a rear end of a receiving pipe of a receiving pipe, and a collar retracted by a predetermined length from the front end of the collar are provided. An annular second flange that is installed at a right angle so that it makes contact with the pilot
At the front end of the pipe, an annular ring that abuts the outer shell at a right angle
First flange is provided, and second flange is cut out
And the protrusions on the first flange so that they face each other.
This is a receiving pilot tube that can be inserted and removed.

The pilot pipe is composed of a cylindrical outer shell and a front and rear first shell.
It is composed of a flange and a second flange, and a rib material is appropriately inserted between the bulges so as to withstand a large propulsive force.
The pilot pipe front end is slightly reduced in diameter from the outer shell so that it can fit into the collar of the previous pilot pipe. In addition, a water-stop packing is attached to the reduced diameter portion in order to prevent infiltration of groundwater and earth and sand from outside the pilot pipe.

Regarding the structure of the projection provided on the insertion port flange of the pilot pipe, when the projection passes through the notch , the stop vanes open to the left and right, and it is possible to cope with withdrawal for repairing the excavator. It has a structure. Also,
The length of the projection below the retaining wing is long enough to allow the pilot pipe to bend.

[0012]

According to the above-mentioned invention, each pilot tube is connected by the projection mechanism so as to be movable in the front-rear direction and can cope with bending. Therefore, even when the direction of the machine is corrected, the machine can be followed well and the pilot pipe can be propelled with high accuracy. Also, the rolling by the face plate of the excavator is prevented from rotating by the projection mechanism provided in each pilot pipe,
It does not adversely affect the propulsion work.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a longitudinal sectional view for explaining the structure of the receiving pilot pipe 1 of the present invention. An outer shell 2 having the same diameter as the outer diameter of the buried main pipe is manufactured into a tubular shape, and an annular first flange 4 is provided at the tip of the outer shell 2 so as to be in contact with and at a right angle. The tip of the outer shell 2 of the pilot tube 1 is slightly reduced in diameter so that the outer shell 2 can be fitted into the receiving portion of the rear end of the pilot tube 1. At the reduced diameter portion of the outer shell 2, a water blocking packing 8 is attached in an annular shape in order to prevent infiltration of ground water or earth and sand from the outside of the pilot pipe 1. A cylindrical collar 3 provided by extending the outer shell 2 is provided at a receiving portion at the rear end of the outer shell 2. An annular second flange 5 is attached at a right angle so as to be inscribed in the collar 3 at a position retracted from the tip of the collar 3 by a predetermined length.

At a predetermined position of the tip first flange 4 of the pilot pipe 1, a projection 6 equipped with a stop wing 10 whose tip can be opened left and right by a spring mechanism or the like is mounted. A notch 7 through which the protrusion 6 can pass is provided in the second flange 5 portion at the rear end of the pilot pipe 1 at the position where the protrusion 6 faces .

FIG. 2 is a receiving type pilot tube 1 of the present invention.
FIG. 6 is a vertical cross-sectional view illustrating a state when the is connected. The first flange 4 at the tip of the outer shell 2 abuts on the second flange 5 at the rear end of the front pilot tube 1 to reliably transmit the original pushing propulsion force from the rear to the front. A rib member 9 is appropriately installed between the flanges so as to withstand a large propulsive force from the rear.

FIG. 3 is a detailed view for explaining the projection 6 for imparting flexibility to the pilot pipe 1 and preventing rolling. A case where the pilot pipe 1 is newly fitted to the rear end receiving portion of the front pilot pipe 1 will be described. The protrusion 6 mounted on the first flange 4 at the tip of the pilot pipe 1 will be described.
At the time of passing through the notch 7 provided in the second flange 5 attached to the rear end of the front pilot pipe 1, the stop wing 10 provided at the tip opens left and right. When the drawing force acts on the pilot pipe 1, it hits the second flange 5 of the front pilot pipe 1 to prevent the drawing. Therefore, the retaining blade 10 of the projection 6 can also be used for pulling out for the purpose of correcting the machine. A conventional technique such as a spring mechanism can be used for the opening / closing mechanism of the retaining blade 10. The length of the projection 6 below the retaining wing 10 is long enough to allow the pilot tube 1 to bend. The number of locations of the protrusions 6 can be appropriately changed to 2 to 4 locations depending on the diameter of the buried pipe, the extension of the thrust, and the like.

FIG. 4 shows the cut provided on the second flange 5.
It is a detailed view explaining the notch 7 . The position of the notch 7 is cut so that it faces the position of the protrusion 6 of the first flange 4.
Due to the lack , the size is slightly larger than the cross section of the protrusion 6.

The pilot pipe 1 thus constructed is
First connected to the excavator. The earth and sand excavated from the excavator can be discharged by a normal earth discharging technique suitable for each construction method. Then, the pilot pipe 1 is sequentially connected to the ground for propulsion. The connection of the pilot pipe 1 is performed by aligning the positions of the notches 7 of the second flange 5 and the protrusions 6 of the first flange 4, and then the pilot pipe 1. Only by pressing 1 for fitting, the connection work becomes easy and the connection time can be shortened.

[0019]

Since the receiving pilot pipe of the present invention has a structure in which each pilot pipe can be bent by the projection mechanism, it is easy to follow the excavator and the direction of the excavator can be easily corrected. Further, since it is a receiving type, it is possible to prevent rolling, which is a problem, by the projection mechanism. Further, the connection of the pilot pipe is only a work of inserting the subsequent pilot pipe into the collar, and the connection time can be greatly shortened as compared with the bolt nut connection work of the prior art.

[0020]

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating the structure of a receiving pilot tube of the present invention.

FIG. 2 is a vertical cross-sectional view illustrating a connected state of a pilot pipe.

FIG. 3 is a detailed view illustrating a protrusion of the first flange portion.

FIG. 4 is a detailed view illustrating a notch in the second flange portion.

[Explanation of symbols]

1 Pilot Pipe 2 Outer Shell 3 Collar 4 First Flange 5 Second Flange 6 Protrusion 7 Notch 8 Water-Proof Packing 9 Rib Material 10 Stop Wing

Claims (1)

(57) [Claims] 1. A receiving pilot tube for long-distance propulsion method
There are a color provided by extending the outer shell to the receptacle portion of the pilot tube rear end, a second flange ring provided at a right angle to be inscribed retreats from the color tip by a predetermined length in color And the outer shell at the tip of the pilot tube front end
An annular first flange that abuts at a right angle is provided, and a second
These have a notch on the flange and a protrusion on the first flange.
Receiving pilot pipe characterized in that it is provided so as to face each other and is removable.