JP2573463B2 - Double pipe propulsion 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 double pipe propulsion method for propelling a double pipe from a lateral wall of a shaft.

[0002]

2. Description of the Related Art For example, a pipe buried underground for sending high-pressure gas is composed of an outer pipe and a main pipe disposed inside the outer pipe in order to maintain the strength and the like of the pipe. Double tubes may be used. Also, when burying this double pipe in the ground, instead of digging and burying a long and narrow groove along the path to be buried from the ground, digging a predetermined shaft and from the side wall of this shaft A so-called propulsion method of burying the double pipe by propelling it in the longitudinal direction may be adopted.

FIG. 2 is a schematic diagram showing a state where a double pipe is being propelled by using a conventional double pipe propulsion method.
The propulsion device 23 has an arm 23a, and this arm 23a is propelling the outer tube 24a constituting the double tube 24. Here, when the propulsion device 23 propels the double pipe 24, for example, if the gas directly acts on the main pipe 24b passing through the inside of the double pipe 24, the main pipe 24b may be damaged. Promotes only the outer tube 24a. The propulsion device 23 is mounted on the shaft 20 so that the outer tube 24a is propelled in the correct direction by the propulsion device 23.
Is installed on a concrete floor 21 formed at the bottom of the vehicle. Since a reaction force is applied to the propulsion device 23 when the outer tube 24a is being propelled by the propulsion, a concrete bearing wall 22 for supporting the reaction force is provided on the left lateral wall of the shaft 20 of FIG. Have been.

After the double pipe 24 is propelled into the ground in this way, the tip (not shown) of another double pipe is connected to the double pipe 2.
4 and welded to the rear end to propel the other double pipe underground.
By repeating this process, the plurality of double tubes 24 are propelled by a predetermined distance, for example, 300 m, and after the leading double tube 24 among the double tubes 24 reaches another shaft (not shown). The propulsion of the double pipe 24 from the shaft 20 ends.
After the completion of the propulsion, the double pipe 24 is further propelled from another shaft (not shown) toward the shaft 20 in the same manner as described above. The shaft includes a propulsion shaft in which the double tube 24 is propelled, and a reaching shaft (not shown) in which the double tube 24 is propelled and reached from the propulsion shaft.
The propulsion shaft has a propulsion device 2 like a shaft 20 shown in FIG.
3 and the concrete bearing wall 22, the length (the length in the left and right directions in FIG. 2) is required to be, for example, about 10 m. Only about 7 m is required.

[0005]

After the double tube 24 reaches another shaft from the shaft 20 as described above, the double tube 24 is moved from another shaft (not shown) toward this shaft 20.
Must be provided with the concrete floor 21 shown in FIG. 2 as described above. For this reason, there is a problem that the cost of propulsion of the double pipe 24 increases and the construction period is prolonged. Shaft 20
In this case, the propulsion device 23 provided in the vehicle must be transported to and installed in the above-mentioned another shaft, which also causes the above-described problem.

In view of the above circumstances, an object of the present invention is to provide a double pipe propulsion method capable of reducing the cost of double pipe propulsion and shortening the construction period.

[0007]

According to the present invention, there is provided a double-pipe propulsion method comprising the steps of: erecting a double pipe having an outer pipe and a main pipe arranged inside the outer pipe; In the double pipe propulsion method for propelling underground from the side wall of the above, the outer pipe of the first double pipe formed by propelling the first double pipe into the ground from the side wall of the shaft The rear end of the first double pipe having the rear end exposed in the shaft and the main pipe protruding from the rear end of the outer pipe by a predetermined length has the same diameter as the outer pipe. And a protective tube having a depth exceeding the predetermined length and covered at one end with a lid, covered with the rear end exposed in the shaft of the first double tube, and covered with the rear end. A supporting wall that covers the protective tube and that is in contact with the lateral wall is constructed, and the supporting wall supports a reaction force, thereby forming an upper part. It is characterized in that to promote the lateral walls facing the lateral wall of the second of the double tube into the ground.

In addition, prior to covering the protective tube on the rear end of the first double tube, the protective tube is closed when the protective tube is covered on the rear end of the main tube. It is preferable to cover a protective cap having a gap between them.

[0009]

The double pipe propulsion method according to the present invention covers the rear end of the first double pipe exposed in the shaft and the protective tube covered by the rear end, Since a supporting wall in contact with the side wall where the heavy pipe is exposed is constructed, a reaction force is supported by the supporting wall, and the second double pipe is propelled into the ground from the side wall facing the side wall. By propelling the double pipe from one shaft in two directions, the concrete floor of the shaft can be effectively used, and the labor for transporting the propulsion device can be saved.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a sectional view showing an embodiment of the double pipe propulsion method of the present invention. The double pipe 4 is propelled underground by a propulsion device (see FIG. 2). In this propulsion, a supporting wall (not shown) is constructed on a side wall facing the side wall 1a, and the propulsion device is constructed. However, the propeller is propelled until the rear end of the double pipe 4 remains in the shaft 1 as shown in FIG. At the time of this promotion, the main 4
In order to prevent damage to b, the double pipe 4 is propelled by applying a propulsive force only to the rear end of the outer pipe 4a. After the propulsion is completed, a protective cap 5 is covered on the rear end of the main pipe 4b of the double pipe 4, and a protective pipe is provided on the rear end of the double pipe with a gap from the protective cap 5. Cover 2
After covering the protective tube 2, the bearing wall 3 is constructed by casting concrete so as to cover the rear end of the double tube 4 and the protective tube 2 and to contact the lateral wall 1a.

To propel a double pipe (not shown) from the side wall facing the side wall 1a into the ground by supporting the reaction force of the propulsion device (not shown) on the supporting wall 3, construct the side wall. After demolishing the bearing wall (not shown), the double pipe is propelled from the side wall into the ground. In order to prevent the reaction force acting on the bearing wall 3 from being applied to the main pipe 4b during this propulsion, the protective pipe 2 is covered with the rear end of the double pipe 4 so as not to contact the main pipe 4b. Have been. After the completion of the propulsion of the double pipe, the supporting wall 3 is disassembled, the protective pipe 2 is removed from the rear end of the double pipe 4, and the protective cap 5 is removed from the rear end of the main pipe 4b. After these are removed, the double pipe 4 is connected to the double pipe propelled from the side wall facing the side wall 1a. During the propulsion of the double pipe, the rear end of the double pipe 4 is protected by the protection pipe 2, so that concrete adhering to the rear end and entry of water or the like are prevented. . This makes it possible to easily connect the double pipes.

The double-pipe propulsion method of the present embodiment propells the double-pipe 4 in two directions only by changing the propulsion direction of an excavator (not shown) installed on the concrete floor 6. Therefore, the cost can be reduced and the construction period can be shortened. In addition, the propulsion method according to the present embodiment can increase the number of shafts used only as reaching shafts without using the shafts as propulsion shafts, so that the amount of work for excavating the shafts can be reduced.

When the support wall 3 is torn down and the protective tube 2 is removed from the rear end of the double tube 4, the protective tube 2
Since the insertion joint 2a is only inserted inside the rear end of the double pipe 4, it can be easily removed. Further, since the protective tube 2 is covered with the rear end of the double tube 4 so as not to contact the main tube 4b, damage to the main tube 4b due to the reaction force of the propulsion of the double tube is prevented.

Further, although the protective cap 5 is not always necessary, it is preferable to cover the rear end of the main pipe 4b in order to reliably prevent earth and sand and water from entering the inside of the main pipe 4b. . Since the supporting wall 3 is supported not only by the lateral wall 1a but also by the double pipe 4, the reaction force acting on the propulsion device can be sufficiently supported.

[0015]

As described above, according to the double pipe propulsion method of the present invention, the supporting wall which covers the rear end of the first double pipe and the protection pipe and is in contact with the lateral wall is constructed. Since the supporting wall supports the reaction force to propel the second double pipe underground, the cost of the propulsion can be reduced by propelling the double pipe in two directions, and the construction period Can be shortened.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a double pipe propulsion method according to the present invention.

FIG. 2 is a schematic view showing a state where a double pipe is being propelled by using a conventional double pipe propulsion method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical shaft 2 Protective tube 3 Supporting wall 4 Double tube 4a Exterior tube 4b Main tube 5 Protective cap 6 Concrete floor

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shingo Nagashima 1-7-7 Suehirocho, Tsurumi-ku, Yokohama City Inside the Pipe Technology Center, Tokyo Keigashi Co., Ltd. (72) Inventor Akira Adachi 3-17 Matsunami, Chuo-ku, Chiba-shi No. 8 (72) Inventor Yu Murakami 172-1 Kamishizu, Sakura-shi, Chiba Prefecture 3-209 Shizu Green Heights 3-209 (72) Inventor Tomoya Fujimoto 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation Tokyo Head Office (72) Inventor Norimitsu Okamura 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation Tokyo Head Office

Claims (2)

(57) [Claims] 1. A double pipe propulsion method for propelling a double pipe having an outer pipe and a main pipe disposed inside the outer pipe from the side wall of the shaft into the ground, A rear end of the outer pipe of the first double pipe formed by propelling the double pipe into the ground is exposed in the shaft and the book is inserted from the rear end of the outer pipe. At the rear end of the first double pipe in a state where the pipe protrudes by a predetermined length, a protective pipe having the same diameter as the outer pipe and having a depth exceeding the predetermined length and closed at one end by a lid is covered. Forming a bearing wall covering the rear end exposed in the shaft of the first double pipe and the protective tube covered by the rear end, and contacting the lateral wall; A double wall is propelled into the ground from a side wall facing the side wall by supporting a reaction force on the pressure wall. Of jacking method. 2. A method according to claim 1, wherein said protective tube is covered with said protective tube at a rear end of said main tube before said protective tube is covered with said protective tube at a rear end of said first double tube. The double pipe propulsion method according to claim 1, wherein a protective cap having a gap between the two is covered.