JP2000145364A - Jacking pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently spread a lubricant to a tail void by providing a lubricant injection hole for jetting the lubricant obliquely rearward of the arbitrary part of a pipe body. SOLUTION: A lubricant injection hole 51 is provided obliquely rearward, the influence of ground which weakens the jet force is lessened to effectively spread a lubricant up to rearward of a jacking pipe 2 so as to facilitate pipe jacking. In this case, if the lubricant injection hole 51 is provided on a male joint part 2b, at first, the lubricant is filled into a gap covered by a female joint part 2c, and spreads on the gap of the whole circumference of the pipe jacking pipe by one lubricant injection hole 51. The lubricant is efficiently injected on the whole circumference of the jacking pipe 2, and clogging of soil and sand or the like for the lubricant injection hole 51 is prevented. Thereby the lubricant is injected in a tail void between the jacking pipe 2 and the ground to remarkably improve sliding effect by the lubricant so as to to facilitate the pipe jacking of the jacking pipe 2, and a pipe jacking distance can be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of injecting a lubricant called a muddy propulsion method or a super-muddy water propulsion method into a tail void (a gap formed between a propulsion pipe and a ground) to propell. The present invention relates to a propulsion pipe for a propulsion method for moving a pipe forward.

[0002]

2. Description of the Related Art Recently, as shown in FIG. 1, as a long-distance propulsion method, a shield machine 1 is disposed at the tip, and a tail void 4 is formed between the outer surface of a subsequent propulsion pipe 2 and a ground 3. A propulsion method has been developed and put into practical use that reduces the propulsion resistance by injecting a lubricant into the tail void 4 from a lubricant injection hole 5 provided in the propulsion pipe 2 and enables long-distance propulsion work.

[0003]

However, in the currently used propulsion pipe 2, the lubricant injection hole 5 is provided in the radial direction as shown in the detailed view of FIG. The plug 7 is removed from the
(See FIG. 1), the lubricant is injected into the tail void 4 by connecting the lubricant 9 to the ground 3 so that the jet output is hindered and the lubricant 9 is injected into the tail void 4 like a rivet. Therefore, it was found that the lubricant 9 did not sufficiently reach the tail void.

[0004] Therefore, the present invention is to provide a propulsion tube in which the lubricant 8 is effectively distributed to the tail void.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a lubricant injection hole for obliquely jetting lubricant rearward at an arbitrary position of a pipe. It is like that. Further, by providing the lubricant injection hole in the male joint, the lubricant can be injected from one lubricant injection hole to the entire circumference of the pipe.

[0006] The position where the injection hole is provided in the pipe is usually provided in the body portion. In this case, however, the lubricant injection hole may be blocked by earth and sand, and the jetting power of the lubricant may be killed. To solve the problem, it is effective to jet the lubricant obliquely rearward.

On the other hand, in order to inject the lubricant into the entire circumference of the tube, it is effective to arrange a plurality of lubricant injection holes on the annular cross section of the tube. First, the lubricant is first filled into the void portion covered by the female joint from one lubricant injection hole, and then injected into the entire circumference of the tube. Further, since the lubricant injection hole is covered with the female joint, clogging with earth and sand can be prevented.

[0008]

Since the lubricant injection hole is provided obliquely toward the rear, the influence of the ground 3 which weakens the jetting power is reduced, and the lubricant 8 spreads effectively to the rear of the propulsion pipe, thereby greatly facilitating the propulsion. .

If the lubricant injection hole is provided in the male joint, the gap covered by the female joint is first filled with the lubricant,
One lubricant injection hole can be injected all around the pipe.

[0010]

FIG. 5 shows an embodiment of the present invention, in which a lubricant injection hole 51 for obliquely ejecting lubricant toward the body 2a and the male joint 2b of the propulsion pipe 2 rearward is shown. Is provided. In the figure, reference numeral 2c denotes a female joint, and 10 denotes a sealing material.

When the lubricant is injected, the plug 7 is removed from the socket 6 as in the prior art, and the injection pipe is connected to inject the lubricant into the tail void.

Since the lubricant injected into the tail void is injected rearward without damaging the momentum by the ground, the slippage between the propulsion pipe 2 and the ground can be improved.

FIG. 6 shows another embodiment of the present invention.
A lubrication injection hole 51 is provided in the male joint portion 2b of the propulsion pipe 2 for obliquely ejecting the lubrication rearward.

Thus, the lubricant injection hole 5 is formed in the male joint 2b.
In the case where 1 is provided, the lubricant is injected rearward through the gap 11 between the male joint 2b and the female joint 2c, and the lubricant injection hole 51 is covered by the female joint 2c. Even with one lubricant injection hole, the lubricant flows around the space 11 around the pipe, and the lubricant is efficiently injected into the entire circumference of the pipe as shown by the arrow. Also, clogging of the lubricant injection hole with earth and sand is prevented.

[0015]

According to the present invention, the lubricant is effectively injected into the tail void between the propulsion pipe and the ground, and the slipping effect of the lubricant is remarkably improved to facilitate the propulsion of the propulsion pipe and extend the propulsion distance. Can be.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a propulsion method.

FIG. 2 is a sectional view of a propulsion pipe used in a conventional propulsion method.

FIG. 3 is an enlarged sectional view of a portion A in FIG. 2;

FIG. 4 is an enlarged sectional view of a portion B in FIG. 2;

FIG. 5 is a sectional view of an embodiment of the present invention.

FIG. 6 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield machine 2 Propulsion pipe 2a Body part 2b Male joint part 2c Female joint part 3 Ground 4 Tail void 5,51 Lubricant injection hole 6 Socket 7 Plug 8 Injection pipe 9 Lubricant 10 Seal material 11 Void

Claims (2)

[Claims] 1. A propulsion pipe provided with a lubricant injection hole for obliquely jetting a lubricant rearward at an arbitrary position of a pipe body. 2. The propulsion pipe according to claim 1, wherein a lubricant injection hole is provided in the male joint.