JP3421793B2 - Propulsion device and 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 propulsion device and a propulsion method used for burying water pipes, gas pipes, petroleum pipes and the like.

[0002]

2. Description of the Related Art For example, when laying a gas pipe in the ground, the cutting method has become difficult in recent years due to traffic conditions and construction pollution. For this reason, the method of pulling the main tube into the sheath tube and the method of direct pressing using a propelling steel tube are adopted.

In the method of drawing the main pipe into the sheath pipe, a sheath pipe such as a steel pipe or a Hume pipe is propelled between the starting shaft and the reaching shaft,
It is a construction method in which the main pipe is drawn into the sheath pipe while being sequentially connected by welding at the starting shaft.

Further, for example, the water-propelled steel pipe of the Japan Waterworks Steel Pipe Association used for the direct pressing method of steel pipe is composed of a double steel pipe of a main pipe and an outer pipe, and mortar is filled between the main pipe and the outer pipe. It is a thing. Propulsive force is applied to this main pipe to propel the main pipe and the exterior pipe at the same time.

In any of the above construction methods, when constructing a long distance, a plurality of middle pushing devices are provided in the middle of the pipe body,
The middle pushing method is adopted in which the whole pushing point and tip end tube body is propelled by the middle pushing device and the original pushing force is divided and propelled by the middle pushing device.

[0006]

In this intermediate pushing method, an intermediate pushing device is set in the middle of the propulsion pipe, and the entire pushing end tube body is propelled from the blade mouth and the intermediate pushing device by the intermediate pushing device. Although the propulsive force is reduced, the propulsive force of the intermediate pushing device is affected by the friction coefficient between the propelling pipe and the soil and requires a large propulsive force. For this reason, it is difficult to work with a small-diameter pipe because it is necessary to use a large center pusher.
It had the disadvantage that it required a sheath tube and a sheath tube with a nominal diameter of 00 mm or more.

The present invention has been made to solve the above disadvantages, and an object thereof is to obtain a pipe propulsion device and a propulsion method capable of propelling a small-diameter pipe over a long distance.

[0008]

A propulsion device for a pipe according to the present invention is a propulsion device for propelling a tubular body having an outer pipe and an inner pipe slidably inserted into the outer pipe. The outer pipe is installed in the vertical shaft and has a pushing means for applying a propulsive force to the pipe body and a blade propulsion means attached to the rear stage of the excavator via a connecting member. And the outer tube at the rear stage of the original pushing means, the tip of the inner tube is fixed to the blade propulsion means, and the tip of the outer tube at the front stage is fixed to the outside of the blade propulsion means attachment part of the connecting member. , After the outer pipe of the former stage fixed to the excavator and the connecting portion is propelled for a certain distance by propelling the excavator with a propulsion force by the blade propulsion means, the outer pipe and inner pipe of the latter stage are pushed by the original pushing means. It is characterized in that the propulsive force is applied to and is propelled by a certain distance alternately.

The propulsion method according to the present invention is a propulsion method for propelling a tubular body having an outer pipe and an inner pipe slidably inserted into the outer pipe, wherein the outer pipe is provided at the front stage on the excavator side. Separate the outer tube and the rear outer tube on the side of the original pushing means, and fix the tip of the inner tube to the blade opening propulsion means attached to the rear stage of the excavator through the connecting member, and the tip of the outer tube at the front stage. Is fixed to the outside of the blade edge propulsion means attachment part of the connecting member, and the blade propulsion means applies propulsive force to the excavator to propel the excavator, and the outer tube of the preceding stage fixed to the excavator and the joint part is at a fixed distance. After propelling, it is characterized by alternately repeating propulsion for a certain distance by applying a propulsive force to the outer pipe and the inner pipe in the subsequent stage by the original pushing means installed in the starting shaft.

[0010]

In the present invention, the blade propulsion means and the original pushing means are alternately operated to propel the excavator and the pipe body by a predetermined distance. Since the blade tip propulsion means propels the excavator at regular intervals, it can be propelled with a relatively small propulsion force.
Further, a blade edge propulsion means for propelling the excavator is installed in the latter stage of the excavator, and the excavator and the tubular body are propelled without installing an intermediate pushing device in the middle portion of the tubular body.

[0011]

1 is a sectional view showing an embodiment of the present invention. As shown in FIG. 1, the propulsion device 1 has a source push jack 2 and a blade edge propulsion jack 3. The source push jack 2 is installed in the starting shaft 4 and applies propulsive force to the pipe body 6 by the hydraulic pressure sent from the source push hydraulic pump 5. The blade propulsion jack 3 is connected to the rear stage of the excavator 8, and the blade propulsion hydraulic pump 7 is connected.
Propulsive force is applied to the excavator 8 by the hydraulic pressure sent from the machine.

The tubular body 6 propelled by the propulsion device 1 is shown in FIG.
As shown in the cross-sectional view of FIG. 1, it is composed of a double steel pipe having an outer pipe 10 and an inner pipe 11 having the same length as the outer pipe 10. A plurality of sliding members 12 are attached to the outer peripheral surface of the inner pipe 11,
It is slidably inserted into.

When the tubular body 6 constructed as described above is laid, first, as shown in the sectional view of the distal end portion of the tubular body in FIG.
At the starting shaft 4, the blade propulsion jack 3 is attached to the excavator 8 via the connecting member 13. The tip portion of the inner pipe 11 is fixed to the blade opening jack 3 and the tip portion of the outer pipe 10 is connected to the connecting member 1.
3 is fixed to the outside of the blade edge propulsion jack 3. Next, the thruster 2 applies a propulsive force to the pipe body 1 to propel the excavator 8. After propelling for a length corresponding to the length L of the outer pipe 10, the outer pipe 10 and the inner pipe 11 at the latter stage are joined, and then the propulsion force is applied to the pipe body 6 again to propel the excavator 8. This propulsion and joining are repeated sequentially.

When the pipe body 6 having the outer pipe 10 and the inner pipe 11 is installed for a long distance by using the original push jack 2 and the blade tip propulsion jack 3, the connecting pipe 14 is provided at the tip end portion or the middle of the pipe body 6. The outer tube 10 of the tubular body 6 is separated by providing it. Connection pipe 1
4, the inner pipe 11a is the outer pipe 1 as shown in the sectional view of FIG.
It is formed to be longer than the length L of 0 by a fixed length L ₁ , and a plurality of sliding members 12 are attached to the outer peripheral surface thereof and slidably inserted into the outer tube 10. A seal pipe 15 is joined to the inner surface of the tip of the outer pipe 10. The seal pipe 15 protrudes from the end portion of the outer pipe 10 by a length L ₂ , and has a ring-shaped seal formed on the outer peripheral surface of the tip thereof from rubber or the like that engages with the inner peripheral surface of the outer pipe 10 to be connected. It has a rule part 16. The length L ₂ of the seal pipe 15 protruding from the outer pipe 10 is longer than the length difference L ₁ between the inner pipe 11 a and the outer pipe 10. When using this connecting pipe 14, as shown in FIG.
After the outer pipe 10 of the connecting pipe 14 that has been suspended is retracted, the inner pipe 11a of the connecting pipe 14 is welded to the inner pipe 11 of the previous stage. After that, the outer pipe 10 of the connecting pipe 14 is advanced to abut against the outer pipe 10 of the previous stage to form a connecting portion.

The operation when the pipe body 6 is laid for a long distance by using the connecting pipe 14 will be described with reference to the process chart of FIG.

As shown in FIG. 6A, the outer tube 1 of the tube body 6
0 and the rear end of the inner pipe 11 are pushed by the original push jack 2 and the propulsion force is applied to the excavator 8 by the blade propulsion jack 3. The propulsive force of the blade propulsion jack 3 propels the outer pipe 10 at the tip of the connecting pipe 14 together with the excavator 8 by a predetermined distance L ₃ as shown in FIG. 6B. Due to the forward movement of the outer pipe 10 at the tip, a gap is created between the outer pipe 10 of the connecting pipe 14 and the outer pipe 10 at the preceding stage. Since this gap is sealed by the seal pipe 15, it is being propelled. It is possible to prevent water or earth and sand from entering between the outer pipe 10 and the inner pipe 11.

After propelling the blade edge propulsion jack 3 by a predetermined distance L ₃ , as shown in FIG. 6 (c), while pushing in the blade edge propulsion jack 3, a thrust force is applied by the original push jack 2,
The outer pipe 10 at the rear end is propelled from the inner pipe 11 and the connecting pipe 14.
After that, the inner tube 11 and the outer tube 10 are joined to the subsequent stage of the propelled tubular body 6, and the above steps are repeated to sequentially propel the tubular body 6.
In this propulsion step, the blade propulsion jack 3 propels only the outer pipe 10 and the excavator 8 at the tip of the connecting pipe 14, so that it can be propelled by the relatively small blade propulsion jack 3, and even a small diameter pipe can be long. Distance construction can be performed easily.

The outer pipe 10 at the front stage mounted on the excavator 8 by alternately operating the blade propulsion jack 3 and the source push jack 2 and the outer pipe 10 at the stage subsequent to the inner pipe 11 and the connecting pipe 14 are alternately arranged. By propelling the tubular body 6, the tubular body 6 can be propelled with a relatively small propulsive force. Moreover, since it is not necessary to provide an intermediate pushing device in the middle of the pipe body 6 other than the connecting pipe 14,
Even small diameter pipes of 00 mm or less can be easily installed over long distances.

In the above embodiment, the inner pipe 1 of the connecting pipe 14 is
Although the case where 1a is made longer than the outer pipe 10 by a certain length has been described, even if the inner pipe 11a has the same length as the outer pipe 10, the excavator 8 with the blade propulsion jack 3 and the original push jack 2 is used.
Propulsive force can be applied to the pipe body 6 and the pipe body 6 alternately.

[0020]

As described above, according to the present invention, the blade tip propulsion means is installed in the latter stage of the excavator, and the excavator and the pipe body are propelled without installing the intermediate pushing means in the middle of the propelling pipe body. Therefore, it is possible to easily carry out long-distance construction using a small-diameter pipe body, and it is possible to enhance the construction efficiency when laying a small-diameter pipe body.

Further, the blade propulsion means and the original pushing means are alternately operated to propel the excavator and the pipe body by a constant distance, so that the pipe body can be propelled with a relatively small propulsion force.
The propulsion device can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a tubular body.

FIG. 3 is a cross-sectional view showing a tip portion of a tubular body.

FIG. 4 is a cross-sectional view showing a connecting pipe.

FIG. 5 is a cross-sectional view showing a process of connecting pipes.

FIG. 6 is a process chart showing the operation of the above embodiment.

[Explanation of symbols]

1 propulsion device 2 original push jack 3 blade promotion jack 4 starting shaft 6 tube 8 excavator 10 outer tube 11 inner tube 14 Connection pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Nakajima 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Co., Ltd. (72) Kazuo Kobayashi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Co., Ltd. (72) Inventor Teruyuki Matsumoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Inventor Yasuhiro Matsuo 122-6 Shimotsuko, Atsugi, Kanagawa Prefecture (72) Satoshi Furuya Kanagawa Prefecture 391-3 Minami-Toyota, Hiratsuka-shi Happi-Shato-201 (72) Inventor Satoshi Mukai 2-12-5 Nishifukui, Ibaraki-shi, Osaka (56) Bibliography Sho 60-151993 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 1/024 E21D 9/06

Claims (2)

(57) [Claims] 1. A propulsion device for propelling a tubular body having an outer pipe and an inner pipe slidably inserted into the outer pipe,
It has an original pushing means installed on the starting shaft and applying a propulsive force to the pipe body, and a blade mouth propulsion means attached to the rear stage of the excavator via a connecting member. Separate the tube and the outer tube on the rear side of the original pushing means, fix the tip of the inner tube to the blade mouth propulsion means, and fix the tip of the outer tube on the front side to the outside of the blade mouth propulsion means mounting part of the connecting member. Then, the blade propulsion means applies propulsive force to the excavator to propel the excavator, and after the outer tube of the former stage fixed to the excavator and the connecting portion propels for a certain distance, it is pushed into the outer tube of the latter stage by the original pushing means. A propulsion device characterized in that a propulsive force is applied to a pipe to propel it for a certain distance, which is repeated alternately. 2. A propulsion method for propelling a tubular body having an outer pipe and an inner pipe slidably inserted into the outer pipe,
The outer pipe is separated into a front outer pipe on the excavator side and a rear outer pipe on the original pushing means side, and the tip of the inner pipe is fixed to the blade propulsion means attached to the rear stage of the excavator via a connecting member. Then, fix the tip of the outer tube at the front stage to the outside of the blade mouth propulsion means attachment part of the connecting member, and apply the propulsive force to the excavator by the blade propulsion means to propel the excavator to the excavator and the connecting part. After propelling a fixed front stage outer tube for a certain distance, it is alternately repeated to apply a propulsive force to the rear stage outer tube and inner tube by a pushing force means installed in the starting shaft to propel it for a certain distance. Propulsion method.