JP4309546B2 - Pipe thruster connecting pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connecting pipe of a pipe propulsion unit used to build a tunnel without excavating the ground when embedding piping or the like in the ground. In particular, the slide cover has a connecting pipe main body. The present invention relates to a connecting pipe of a pipe propulsion device that can be easily slid upward to securely fix a succeeding connecting pipe main body linearly.
[0002]
[Prior art]
When embedding various pipes such as communication pipes into which telephone lines are inserted, sewers and gas pipes in the ground, pipes with multiple connecting pipe bodies connected flexibly are drawn out to the pipe embedding locations and pipes are promoted. A non-cutting method is adopted in which a tunnel is built without excavating the ground by pushing it back continuously after being propelled using a machine, and a pipe is pushed and buried in that part.
[0003]
And as a connection pipe of a pipe propulsion machine used for such a non-cutting method, one disclosed in Japanese Patent Application Laid-Open No. 11-117668 is known. The present invention provides a slide cover for connecting the connecting tube main bodies flexibly by connecting portions provided at both ends in the longitudinal direction of the connecting tube main body, and sliding on the connecting tube main body to cover the connecting portion. The pipe body is fixed linearly.
[0004]
That is, the pipe propulsion device is composed of a hydraulic jack and a slide table. Here, in order to pay out the connecting pipe, first, the preceding connecting pipe main body is set on the slide table. At this time, the succeeding connecting pipe main body is bent at the connecting portion with the preceding connecting pipe main body and is in a vertically standing state. Then, the table is slid with a hydraulic jack, the preceding connecting pipe body is fed out according to the guide, and is press-fitted into the ground. Next, when the hydraulic jack is returned and the table is slid in the reverse direction, the angle of the subsequent connecting pipe body is gradually laid down, and when the slide table returns to its original position, the subsequent connecting pipe body is placed on the slide table. To be set. Then, the subsequent connecting pipe main body becomes the preceding connecting pipe main body, and the connecting pipe main body is continuously drawn out by repeating the above operation.
[0005]
Then, the slide cover of the connecting pipe body is subjected to frictional resistance due to earth pressure when the preceding connecting pipe body is propelled in the ground, and as a result, the sliding cover of the preceding connecting pipe body and the succeeding connecting pipe body Cover the connecting portion and slide relatively until it is locked by the stopper of the subsequent connecting pipe body. Accordingly, the front and rear connecting pipe bodies are linearly fixed by the slide cover and the rigidity is ensured, so that the connecting pipe bodies are linearly propelled. The slide cover locked by the stopper of the subsequent connecting pipe main body is then propelled together with the subsequent connecting pipe main body.
[0006]
[Problems to be solved by the invention]
However, the connecting pipe of the conventional pipe propulsion device has a problem that the slide cover is caught at the connecting part between the connecting pipe bodies, and as a result, the connecting part cannot be covered and the connecting pipe bodies cannot be fixed linearly. There was a thing. That is, when the preceding connecting pipe body is extended by the hydraulic jack, the slide cover is stopped by the projection provided on the slide table, and slides on the preceding connecting pipe body to the connecting portion with the succeeding connecting pipe body. It reaches. However, if any bending remains at the connection part at this point, the tip of the slide cover will come into contact with the inclined connecting pipe body, and the upper and lower parts of the inner surface of the slide cover will follow the outer surface of the connecting pipe body. Will not be able to slide any further.
[0007]
In view of this, the present invention prevents the sliding cover and the following connecting pipe body from engaging with each other so that the slide cover smoothly slides on the preceding connecting pipe body. An object of the present invention is to provide a connecting pipe for a pipe propulsion device in which a connecting portion is securely covered so that front and rear connecting pipe bodies are fixed linearly in any situation.
[0008]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-described problems, and the gist of the present invention is a connecting pipe in which the connecting pipe bodies of the pipe propulsion unit are connected to each other in a bendable manner in the longitudinal direction of the connecting pipe body. A connecting portion provided at both ends, a slide cover that linearly fixes a connecting tube that follows by sliding on the connecting tube main body to cover the connecting portion, and a slide cover provided on the connecting tube main body. It comprises a stopper for locking the slide, and relates to a connecting pipe of a pipe propulsion machine in which at least one tip side of the connecting portion is reduced in diameter.
[0009]
Further, the connecting pipe is composed of the connecting portion, the slide cover, and the stopper as described above, and the connecting portion is not reduced in diameter, and conversely, the connecting portion side of the connecting pipe in the slide cover is expanded in diameter. This relates to the connecting pipe of the existing pipe propulsion unit. Of course, it is possible to reduce the diameter of at least one distal end of the connecting portion and to increase the diameter of the connecting portion of the connecting pipe in the slide cover.
[0010]
Preferably, the connecting tube main body and the slide cover are made of anodized aluminum surfaces, and the connecting tube main bodies are fitted into a T-shaped pin inserted into the connecting portion and one end of the pin. This relates to a connecting pipe of a pipe propulsion machine connected by a retaining ring.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
As described above, the connecting pipe of the pipe propulsion unit of the present invention includes a connecting portion provided at both ends in the longitudinal direction of the connecting pipe main body, and a subsequent connecting by sliding on the connecting pipe main body to cover the connecting portion. It consists of a slide cover that fixes the pipe linearly and a stopper that locks the slide of the slide cover provided on the connecting pipe main body.
[0012]
Here, the connecting pipe main body is sequentially drawn out by a pipe propulsion machine and press-fitted into the ground. Therefore, the connecting pipe body propels the ground while receiving frictional resistance due to earth pressure. Therefore, carbon steel is generally used because the connecting pipe body is required to have a suitable strength. On the other hand, the front and rear connecting pipe main bodies are connected each time in accordance with the propulsion of the preceding connecting pipe main body.
[0013]
Therefore, it is preferable that the connecting pipe body is made of aluminum and the surface thereof is anodized. This is because the weight can be reduced and the workability can be greatly improved by using aluminum, and the decrease in surface strength due to the use of aluminum can be compensated by anodizing treatment.
[0014]
Moreover, the connection part is provided in the both ends of the longitudinal direction of a connection pipe main body. In other words, the connecting pipe can be bent in consideration of the ease of setting and feeding to the pipe propulsion unit. For this purpose, the connecting pipe main body is connected in a rotatable manner at the connecting portion. Here, the connection between the connecting pipe bodies can be screwed with a general bolt / nut or the like, but a T-shaped pin is inserted into the connecting portion, and a retaining ring is fitted into one end of the pin for connection. It is preferable. This is because the front and rear connecting pipe bodies are sequentially connected and drawn out at the time of tunnel construction, and then pulled back and collected, so that connection and disconnection work is frequent, and ease of work is required.
[0015]
The connecting pipe that is made flexible in this way is linearly fixed by the slide cover. That is, the slide cover slides on the connecting pipe body in accordance with the propulsion of the connecting pipe body and covers the connection portion. Therefore, the bending of the front and rear connecting pipe bodies is limited by the slide cover and fixed linearly.
[0016]
Here, a stopper is provided in the connecting pipe main body so that the slide cover does not slide beyond the connecting portion. In other words, when the slide cover reaches the connecting portion by sliding the preceding connecting tube main body, it hits the stopper of the following connecting tube main body and is locked in a state where it has just covered the connecting portion. Promote together.
[0017]
The slide cover is initially stopped by the projection provided on the slide table when the preceding connecting pipe body is fed out by a hydraulic jack, and the slide cover slides on the preceding connecting pipe body to connect to the succeeding connecting pipe body. To the department. In addition, after that, the connecting pipe body receives frictional resistance due to earth pressure when propelling in the ground and stays at the connecting portion. Therefore, the slide cover is required to have a strength that can withstand bending at the connecting portion of the connecting pipe, and is also required to be lightweight from the viewpoint of workability. Therefore, the slide cover is preferably anodized on the surface of aluminum.
[0018]
The greatest feature of the present invention is that the diameter of at least one of the connecting portions is reduced. Therefore, the engagement between the slide cover and the subsequent connecting pipe main body is prevented, the slide cover smoothly slides on the preceding connecting pipe main body to cover the connecting portion, and the connecting pipe main bodies are securely fixed linearly. It is.
[0019]
That is, when the preceding connecting pipe main body is drawn out by the hydraulic jack, the slide cover is stopped by the protrusion provided on the slide table and slides to the connecting portion with the subsequent connecting pipe main body. At this time, even if the connection portion remains bent, in the present invention, since the distal end side of the connection portion is reduced in diameter, the upper and lower parts of the inner surface of the distal end of the slide cover You will come in contact late. Therefore, since the subsequent connecting pipe body has a grace period in which the angle is sufficiently lowered, the slide cover smoothly slides on the preceding connecting pipe body without being caught at the connecting portion between the connecting pipe bodies. .
[0020]
Here, even if only one of the connection portions has a reduced diameter on the distal end side, the sliding cover and the connecting pipe main body can be prevented from being meshed with each other. Thus, the smoothness of the slide can be further improved.
[0021]
Further, instead of reducing the diameter of the distal end side of the connecting portion, the diameter of the connecting portion side of the slide cover can be increased. In other words, the slide cover needs to have an inner diameter that is reasonably large with respect to the outer diameter of the connecting pipe body in order to smoothly slide on the connecting pipe body, but within the range that does not interfere with the slide, This is because, if the diameter is increased, it is possible to relatively obtain the same effect as that of reducing the diameter of the distal end side of the connecting portion. Furthermore, if the diameter reduction on the distal end side of the connection portion and the diameter expansion on the connection portion side of the slide cover are performed simultaneously, the smoothness of the slide can be further improved.
[0022]
In addition, the shape of the diameter reduction of a connection part can employ | adopt various shapes, without being specifically limited, such as providing a taper shape or a level | step difference, and reducing a diameter. Also, the diameter of the slide cover can be increased without any particular limitation, such as increasing the inner surface in a tapered shape with the inner surface facing the connecting portion or providing a step to increase the diameter. it can.
[0023]
【Example】
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a connecting pipe of a pipe propulsion device according to the present invention. Here, the connecting pipe is composed of connecting pipe bodies 11, 12, 13, 14 and slide covers 21, 22, 23, 24. Then, connecting portions 12A and 12B are provided at both ends in the longitudinal direction of the connecting tube main body 12, respectively. The connecting portion 12A is a connecting portion 11B of the preceding connecting tube main body 11, and the connecting portion 12B is the connecting tube main body 13 of the following. The connecting portion 13A is flexibly connected.
[0024]
Next, the operational relationship between the connecting pipe main body and the slide cover will be described. Initially, the slide cover 23 of the connecting pipe main body 13 is in contact with the stopper 13C side. When the preceding connecting pipe main body is drawn out to the left, the slide cover stays at the position by a projection provided on a slide table (not shown), and the connecting portions 12B and 13A are connected like the slide cover 22 of the connecting pipe main body 12. It comes to cover.
[0025]
At this time, even if bending remains between the connecting portions 12B and 13A, the top ends of the connecting portions 12B and 13A are reduced in diameter, so the upper and lower portions of the inner surface of the right end of the slide cover 22 shown in the sectional view are The outer surface of the connecting portion 13A of the connecting pipe main body 13 does not come into contact. Therefore, the slide cover 22 slides smoothly on the connecting pipe main body 12 without being caught by the connecting portion 13A. Then, the connecting portions 11B and 12A are completely covered like the slide cover 21 of the connecting pipe main body 11, and are abutted and locked to the stopper 12C on the connecting pipe main body 12 side to linearly connect the connecting pipe main bodies 11 and 12. It is fixed. After that, the slide cover 21 is promoted together with the connecting pipe main body 12.
[0026]
FIG. 2 is a view showing the connecting pipe main body 1 and the slide cover 2. Here, the connecting pipe main body 1 and the slide cover 2 are each formed by anodizing the surface of aluminum. And the connection parts 1A and 1B are provided in the both ends of the connection pipe main body 1, respectively. Here, as shown to FIG. 2 (A), the connection part 1A becomes a shape which can be inserted between the connection parts 1B, and can connect the front and back connecting pipe main bodies mutually.
[0027]
That is, as shown in the cross-sectional view of FIG. 2C, the connecting portion 1A of one connecting pipe body is sandwiched between the connecting portions 1B of the other connecting tube body, and the inserted T-shaped pin 3 is inserted. A retaining ring 4 is fitted and connected to one end. Therefore, both connecting pipe main bodies can be bent around the pin 3. The T-shaped pin 3 is also formed by anodizing the surface of aluminum.
[0028]
Further, as shown in FIG. 2B, the connecting portions 1A and 1B are both reduced in diameter, but the connecting portion 1A side is tapered, and the connecting portion 1B side is reduced in diameter by providing a step. is doing. The degree of diameter reduction is 4 mm for the diameter of the semicircle on the distal end side of the connecting portion 1A and 2 mm for the upper and lower sides on the distal end side of the connecting portion 1B with respect to the outer diameter of the connecting pipe main body.
[0029]
Furthermore, as shown in FIG. 2D, the slide cover 2 has a cylindrical shape, and in the example shown in the figure, has a uniform diameter over the entire length. The slide cover 2 slides on the connecting pipe main body 1 until it abuts against the stopper 1C.
[0030]
【The invention's effect】
As described above, according to the present invention, the distal end side of the connecting portion of the connecting pipe body is reduced in diameter, or the connecting portion side of the connecting pipe in the slide cover is enlarged, so that the slide cover and the succeeding connecting pipe body are provided. And the slide cover smoothly slides on the preceding connecting tube body, and reliably covers the connecting portion between the preceding connecting tube body and the succeeding connecting tube body. Accordingly, the front and rear connecting pipe bodies can be reliably fixed linearly under any circumstances.
[Brief description of the drawings]
FIG. 1 is a view showing a connecting pipe of a pipe propulsion device according to the present invention.
FIG. 2 is a view showing a connecting pipe main body and a slide cover.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Connecting pipe main body 1A, 1B ... Connection part 1C ... Stopper 2 ... Slide cover 3 ... T-shaped pin 4 ... Retaining ring 11, 12, 13, 14 ... Connecting pipe main body 11B, 12A, 12B, 13A ... Connecting part 12C , 13C Stopper 21, 22, 23, 24 Slide cover

Claims (4)

A connecting pipe of a pipe propulsion unit used in a non-open cutting method, wherein the main bodies are flexibly connected to each other, the connecting portions provided at both ends in the longitudinal direction of the connecting pipe main body, and the connecting pipe main body The slide cover includes a slide cover that linearly fixes a subsequent connecting pipe by sliding the cover to cover the connecting portion, and a stopper that locks the slide of the slide cover provided on the connecting pipe body. A connecting pipe for a pipe propulsion device, wherein the connecting portion side of the connecting pipe is expanded in diameter. A connecting pipe of a pipe propulsion unit used in a non-open cutting method, wherein the main bodies are flexibly connected to each other, the connecting portions provided at both ends in the longitudinal direction of the connecting pipe main body, and the connecting pipe main body The connecting portion includes a slide cover that linearly fixes a subsequent connecting tube by covering the connecting portion and a stopper that locks the slide cover provided on the connecting tube main body. A connecting pipe for a pipe propulsion device, characterized in that at least one of the tip ends thereof is reduced in diameter, and the connecting portion side of the connecting pipe in the slide cover is expanded in diameter. The connecting pipe for a pipe propulsion device according to claim 1 or 2, wherein the connecting pipe main body and the slide cover are made of an anodized aluminum surface. The connecting pipe main bodies are connected to each other by a T-shaped pin inserted into a connecting portion and a retaining ring fitted into one end of the pin. The connecting pipe of the pipe propulsion device described in 1.

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