JP3301561B2 - Existing buried pipe non-cutting cloth replacement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing existing buried pipes such as water pipes buried underground with new pipes without cutting.

[0002]

2. Description of the Related Art As a method of laying an existing buried pipe to a new pipe without digging, for example, JP-A-57-120789, JP-A-59-173492, and JP-A-63-163
As disclosed in Japanese Patent No. 12593, there is known a method of burying an existing buried pipe by crushing an existing buried pipe while propelling a new pipe.

In such a construction method, when a new pipe is propelled while crushing an existing buried pipe, a leading device is provided at the tip of the new pipe. The leading device is disclosed in
As disclosed in JP-A-120789, a tapered cutting surface is provided at the tip of a body portion, and the cutting surface is used to guide the propulsion of a subsequent new pipe while breaking and crushing an existing buried pipe. It has been known.

Further, as disclosed in JP-A-59-173492, a guide member and a tapered pipe expanding member are provided, and the guide member is rotated while being inserted into an existing buried pipe and provided on the pipe expanding member. There is known an apparatus in which an existing buried pipe is crushed by a boring operation using a boring projection.

[0005]

According to such a laying method, new pipes are sequentially propelled and buried in the existing buried pipe section crushed by the new pipe leading device. The new pipe may not be concentric with the existing pipe and may not be buried concentrically with the existing pipe.

Further, the propulsion force of the propulsion device needs to be larger than the sum of the pushing force required for crushing the existing buried pipe of the new pipe leading device and the propulsion resistance of the new pipe, and the propulsion device becomes large. When the propulsion device becomes large, the starting shaft for propelling the new pipe becomes large, and the open area becomes large accordingly, so that the advantage of the non-drilling installation replacement is reduced.

Accordingly, an object of the present invention is to provide a method for replacing an existing buried pipe without cutting and digging so as to solve the above-mentioned problems.

[0008]

Means for Solving the Problems Break incision from the starting shaft 2
The device 6 is installed in the existing buried pipe 4 and the propulsion
Pushing sequentially through the push rod 9 by the position 5
Broken the existing buried pipe 4 until al arrival pit 3, after this,
With the push rod 9 remaining in the existing buried pipe 4,
Existing buried pipe obtained by breaking the diameter expanding device 20 from the starting shaft 2
4, the propulsion device 5 uses the remaining push rod 9 as a guide.
To increase the diameter of the existing buried pipe 4
The existing buried pipe is not opened, characterized in that the pipe 21 is buried under propulsion.
Replacing method.

[0009]

[ Operation ] First, the break incision device 6 is inserted into the existing buried pipe 4.
Pushing in sequentially via the push rod 9 by the propulsion device 5 to start
Break the existing buried pipe 4 from the shaft 2 to the reaching shaft 3
After that, the existing burial which was broken using the aforementioned push rod 9 as a guide
The diameter expanding device 20 is sequentially placed in the pipe 4 by the aforementioned propulsion device 5.
Push in the new pipe 21 while expanding the existing buried pipe 4
Since the propulsion device 5 is buried and buried,
The expansion device 20 and the new pipe 21 are simultaneously pushed into the existing buried pipe 4.
First, the rupture incision device 6 is propelled,
Later, the diameter expansion device 20 and the new pipe 21 are propelled. Therefore, promotion
The driving force of the device 5 is based on
Pushing force required for incision or expanding existing buried pipe of diameter expanding device 20
To the greater of the sum of the pushing force and the new pipe propulsion resistance required
Propulsion is good. Therefore, the propulsion force of the propulsion device 5 is
The cutting and incising device 6, the diameter expanding device 20, and the new pipe 21 are simultaneously propelled.
The propulsion device 5 can be made smaller because
The opening area of the starting shaft is reduced, and
The benefits of replacement can be maximized. In addition, break cut
Push rod 9 for pushing opening device 6 into existing buried pipe 4
Pushing the diameter expansion device 20 as the guide and propelling the new pipe 21
New pipe 21 is buried concentrically with existing buried pipe 4
it can.

[0010]

[Example] As shown in FIG. 1, a starting shaft 2 and a reaching shaft 3 are excavated at a predetermined distance such as both ends of a road 1, and an existing buried pipe 4 is inserted into the starting shaft 2 and the reaching shaft 3. Face. A propulsion device 5 is provided in the starting shaft 2, and the breaking and incision device 6 is pushed into the existing buried pipe 4 by the propulsion device 5 to break the existing buried pipe 4.

The propulsion device 5 comprises a jack 7 and a push plate 8.
Is pushed into the existing buried pipe 4. This push rod 9 is a small-diameter tube or H
The diameter is smaller than the inner diameter of the existing buried pipe 4 made of steel or the like.

[0012] As shown in FIG.
A plurality of guide rollers 11 are radially attached to a front portion of the main body 10 to form a guide portion 12, and a plurality of breakage incision rollers 13 are radially mounted to a rear portion of the main body 10 to form a breakage incision portion 14. The temporary arc trajectory connecting the plurality of guide rollers 11, that is, the outer diameter of the guide portion 12 is substantially the same as the inner diameter of the existing buried pipe 4, and the temporary arc connecting the plurality of radially mounted cut-away rollers 13. The trajectory, that is, the outer diameter of the cut-away portion 14 is larger than the inner diameter of the existing buried pipe 4 and smaller than the outer diameter.

[0013] As described above, a plurality of arc-shaped pieces are cracked in the existing buried pipe 4 by pushing the rupture and incision device 6 into the existing buried pipe 4, but the outer diameter of the rupture incision 14 is as described above. Therefore, the broken existing buried pipe 4 returns to the original outer diameter, and the fragments do not fall or scatter in the ground.

Next, as shown in FIG. 3, with the push rod 9 remaining in the existing buried pipe 4, the diameter expanding device 20 is sequentially pushed into the existing buried pipe 4 from the starting shaft 2 along the push rod 9. The new pipe 21 is buried while the existing buried pipe 4 is expanded in diameter. At this time, the end of the push rod 9 is held so that the push rod 9 is concentric with the existing buried pipe.

At this time, since the diameter expanding device 20 is guided by the push rod 9 and is sequentially pushed concentrically with the existing buried pipe 4, the new pipe 21 can be propelled and buried coaxially with the existing buried pipe 4.

As shown in FIG. 4, the diameter expanding device 20 has a through hole 23 formed at the center of the main body 22 so as to be continuous with the front surface 22a and the rear surface 22b. The rollers 24 are provided radially to form a first enlarged diameter portion 25, and a plurality of second enlarged diameter rollers 26 are provided radially near the rear portion of the main body 22 to form a second enlarged diameter portion 27.
5 is slightly larger than the outer diameter of the rupture incision portion 14 of the rupture and incision device 6, and the outer diameter of the second enlarged diameter portion 27 is
It is larger than the outside diameter.

[0017]

According to the first aspect of the present invention, firstly,
The breaking and cutting device 6 is pushed into the buried pipe 4 by the propulsion device 5.
Push down sequentially through the rod 9 to reach the starting shaft 2 from the starting shaft 2
3 and the existing buried pipe 4 is broken,
9 in the existing buried pipe 4 broken by the guide 9
0 is sequentially pushed by the above-mentioned propulsion device 5 to bury the existing
As the new pipe 21 is buried while expanding the pipe 4,
The propulsion device 5 described above includes a rupture incision device 6, a diameter expansion device 20, and a new pipe.
21 is not simultaneously propelled into the existing buried pipe 4,
Instead, the rupture incision device 6 is propelled, and then the
The new pipe 21 is promoted. Therefore, the thrust of the propulsion device 5 is
Pushing force required for breaking / cutting existing buried pipe of breaking / cutting device 6
Or the pushing force required for expanding the existing buried pipe of the
A propulsion force suitable for the greater sum of tube propulsion resistance is sufficient. did
Accordingly, the propulsion force of the propulsion device 5 is reduced by the fracture incision device 6 and the diameter expansion.
Smaller than the method of simultaneously propelling the device 20 and the new pipe 21
The size of the propulsion device 5 can be reduced, and the opening of the starting shaft can be reduced.
Minimize the area to maximize the benefits of non-cutting replacement
Can be obtained. In addition, the break incision device 6 is buried in the existing
Diameter expanding device using push rod 9 for pushing it into pipe 4 as a guide
20 is pushed in and new tube 21 is propelled and buried.
1 can be buried concentrically with the existing buried pipe 4. Claim 2
According to the invention, the rupture incision portion 1 of the rupture incision device 6 is provided.
4 is larger than the inner diameter of the existing buried pipe 4 and larger than the outer diameter.
The small and broken existing buried pipe 4 returns to its original diameter.
Therefore, broken pieces of the existing buried pipe 4 may fall,
There is no scattering inside.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a pushing step of a rupture incision apparatus.

FIG. 2 is a front view of the rupture incision device.

FIG. 3 is an explanatory view of a new pipe pushing step.

FIG. 4 is a front view of the diameter expanding device.

[Explanation of symbols]

4: Existing buried pipe, 5: Propulsion device, 6: Breaking and incising device, 9
... push rod, 20 ... diameter expansion device, 21 ... new tube.

Continued on the front page (72) Inventor Kenji Okubo 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Takuro Odahara 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Toshio Waki 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Naoya Nomura 23, Tsutsuzu-cho, Komatsu City, Ishikawa Prefecture Komatsu Ltd. Awazu Plant (72) Invention Person Tadashi Onishi 23 Tsutsuzucho, Komatsu-shi, Ishikawa Prefecture Inside the Awazu Plant, Komatsu Manufacturing Co., Ltd. (56) References JP-A-63-26482 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name ) F16L 1/024 E21D 9/06

Claims (2)

(57) [Claims] 1. A breaking and incising device 6 is buried from a starting shaft 2
A push rod is pushed into the erection pipe 4 by the propulsion device 5 in the starting shaft 2.
9 through the starting shaft 2 to the reaching shaft 3
The existing buried pipe 4 is broken, and after that, the pushing rod 9 is left inside the existing buried pipe 4.
In this state, the diameter expanding device 20 was broken from the starting shaft 2.
In the existing buried pipe 4, the remaining push rod 9 is used as a guide.
The existing buried pipe 4 is expanded by pushing it sequentially by the propulsion device 5.
The existing pipe is characterized by the fact that the new pipe 21 is buried while propelled.
Buried pipe non-cutting cloth replacement method. 2. An outer diameter of the breaking incision portion 14 of the breaking incision device 6 is made larger than the inner diameter of the existing buried pipe 4 and smaller than the outer diameter so that the broken existing buried pipe 4 returns to its original diameter, and is expanded in diameter. 2. The existing buried pipe according to claim 1, wherein the outer diameter of the enlarged diameter portion of the device is made larger than the outer diameter of the existing buried pipe, and the broken existing buried pipe is expanded to promote the new pipe. Non-cutting cloth replacement method.