JPH0821186A - Tube for propulsion method - Google Patents

Abstract

(57) [Summary] [Purpose] A short length of propulsion method pipe of the required length can be easily made at the laying site, and furthermore, the propulsion method pipe most suitable for the site conditions such as soil quality can be easily manufactured. Make it possible to make. [Structure] A plurality of exterior rings 11 are fitted on the outer circumference of a tube body 4 between a receiving opening 2 formed at one end and an insertion opening 3 formed at the other end in the tube axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion construction pipe.

[0002]

2. Description of the Related Art A propulsion method for laying a pipe body by propelling it into the ground is known. As a pipe used in this propulsion method, a pipe shown in FIG. 8 is generally used. Here, 1 is a cast iron pipe main body, and a receiving port 2 is formed at one end thereof, and an insertion port 3 is formed at the other end thereof. On the outer periphery of the tube body portion 4 between the receiving opening 2 and the insertion opening 3, the receiving opening 2
A thin-walled exterior steel pipe 5 having an outer diameter substantially the same as the outer diameter is fitted. A filling material 6 such as cement mortar or reinforced concrete is filled between the exterior steel pipe 5 and the pipe body portion 4 to form an exterior portion 7. The exterior portion 7 acts to reduce resistance when propelling in the ground by making the outer diameter of the tube body portion 4 uniform with the outer diameter of the receiving port 2.

An inner portion 8 is formed on the inner surface of the pipe body 1 by painting or lining in order to improve anticorrosion performance and water passage performance. The two pipes are joined by inserting the insertion port of the other pipe into the reception port of the adjacent one pipe, and 9 is an annular sealing material for sealing between the reception port insertion ports at that time. Is.

[0004]

However, in such a conventional pipe for propulsion method, when the length of the pipe for cutting is shortened by cutting at the laying site, the working is difficult and takes a long time. There is a point.

That is, when attempting to make such a short pipe at a laying site, first, the exterior steel pipe 5 is cut into a predetermined length by a cutting machine, and the filler 6 is similarly cut into a predetermined length by a cutting machine. There is a need. Then, it is necessary to remove the cut pieces of the exterior steel pipe 5 and the filler 6 from the outer periphery of the pipe body 4, and then cut the pipe body 1 to a predetermined length. At this time, in order to form a shortened tube insertion opening, the tube main body 1 is cut in a state in which a certain length protrudes from the remaining exterior portion 7. Then, by removing the remaining portion of the filler 6 attached to the outer surface of the protruding portion of the tube main body of a fixed length, a new insertion port is formed.

As described above, a lot of difficult work is required in order, and the outer steel pipe 5, the filler 6 and the pipe body 1 are also required.
Since different materials are used for the cutting work, a skilled worker is required for the cutting work.

Further, the conventional propulsion method pipe has a problem that it is difficult to make the propulsion method pipe according to the conditions of the laying site. That is, pipes are manufactured using exterior steel pipes and fillers of a predetermined standard in the manufacturing plant, whereas at the laying site, it is desirable to use exterior steel pipes and fillers according to the conditions. Many. For example, in the case of a site condition in which a severe load is applied from the outside, it is required to thicken the exterior steel pipe 5 or use a high-strength reinforced concrete or the like as the filler 6, but on the other hand, in soft ground or the like. In the case of field conditions where almost no load is applied, the opposite situation is often demanded.

Further, if the above-mentioned conventional structure is used to manufacture the above-mentioned pipe for the propulsion method, it is very inefficient in mass production, and in terms of cost and product management. However, there is a problem that it is not a good idea.

Therefore, the present invention solves such a problem, a short length of pipe for propulsion method having a required length can be easily produced at a laying site, and more particularly, it is most suitable for site conditions such as soil quality. The purpose is to make it possible to easily make a pipe for a propulsion method.

[0010]

In order to achieve the above object, the present invention is directed to the outer circumference of a tube body between a receiving opening formed at one end and an insertion opening formed at the other end in the pipe axial direction. It is an external fit of multiple exterior rings.

[0011]

To shorten the propulsion method pipe having such a structure, it is sufficient to remove the outer ring of the length required for cutting from the outer periphery of the pipe body and then cut only the pipe body. In addition, a pipe for propulsion method suitable for the conditions of the laying site can be obtained only by using the outer ring having different material, strength, hardness, etc. Moreover, since the exterior ring can be easily removed from the tube body, it is easy to change the specifications of the tube.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will now be described in detail with reference to the drawings, in which the same members as those shown in FIG. 8 are designated by the same reference numerals.

FIG. 1 shows an embodiment of the propulsion method pipe of the present invention. Here, the exterior portion 7 is composed of a plurality of exterior rings 11 in the pipe axis direction, and each exterior ring 11 is externally fitted to the outer periphery of the tubular body portion 4. This exterior ring 11
As shown in FIG. 2, is made of a thick-walled tubular concrete body or the like, and its inner diameter is formed to be slightly larger than the outer diameter of the tube body 4. Therefore, it is possible to easily fit the outer periphery of the tube body portion 4 from the insertion opening 3 side. The outer diameter of the exterior ring 11 is formed to be substantially the same as the outer diameter of the receiving port 2, and is configured to function as a propulsion pipe with low propulsion resistance. The length L of the outer ring 11 in the tube axis direction is formed to be equal to the length D of the exposed portion of the tube body 1 forming the insertion opening 3, for example.

When the pipe for the propulsion method having such a structure is cut and used at the laying site to be shortened, only the outer rings 11 corresponding to the cut length are provided from the outer circumference of the tube body 4. It is only necessary to remove it and then cut off only the tube body 1.

For example, when a short pipe having a length up to the cutting line Z in FIG. It is only necessary to remove the outer ring 11b near the receiving port 2 and then cut the tube body 1 along the cutting line Z. Then, when the length L of the exterior ring 11 is equal to the length D of the insertion opening 3 as described above, the exterior main body ring 11b on the receiving side with respect to the cutting line Z is removed from the pipe body 1 at a location where The part forms a new insertion opening of a predetermined length.

FIG. 3 shows an example of a propulsion method using the propulsion method tube of FIG. Here, 13 is a starting shaft and 14 is a reaching shaft, both of which are excavated from the surface to the ground.
The reaching shaft 14 has a concrete wall 17 formed on the inner surface thereof so as to function as a manhole after the completion of the laying of the pipeline. Reference numeral 15 is a standard length propulsion method pipe, which is pushed by a jack provided in the starting shaft 13,
From the starting shaft 13 to the reaching shaft 14, it is propelled horizontally in the ground. Immediately before the first one of the pipes 15 reaches the reaching shaft 15, as a pipe for the final propulsion method that constitutes the pipeline of this part, a pipe with a special length corresponding to the remaining propulsion length, that is, The short propulsion method pipe 16 produced on site by the above-mentioned cutting process is joined. Then this tube 16
By the propulsion corresponding to the length of, the laying of the pipeline is completed as shown in the figure.

FIG. 4 shows another example of the propulsion method using the propulsion method tube of FIG. Here, the pipe is laid by propelling only by the standard length propulsion method pipe 15, and the rearmost propulsion method pipe 15 on the side of the starting shaft 13 is propelled into the ground over its entire length. Then, on the side of the reaching shaft 14, the tip end portion of the pipe 15 at the front end on the insertion side projects into the shaft 14, so that the exterior ring of the projecting portion is removed to cut the pipe body.
This construction method is particularly advantageously applied when the cutting operation can be easily performed in the reaching shaft 14.

Further, according to the structure shown in FIG. 1, it is possible to obtain the propulsion method pipe suitable for the conditions of the laying site only by changing the material, strength and hardness of the outer ring 11. Moreover, since the outer ring 11 is only fitted onto the tube body portion 4, it can be easily removed, and therefore, the specification of the tube can be changed very easily.

In the embodiment shown in FIG. 5, the outer diameter of the exterior ring 11 is larger than the outer diameter of the receiving port 2 and is adapted to the outer diameter of the propulsion machine. As another embodiment, the exterior ring 11 may be fixed to the outer circumference of the tube body 4 by adhesion. This prevents the outer ring 11 from being displaced. In addition, since the adhesive is filled in the gap between the exterior ring 11 and the pipe body portion 4 by the adhesive fixing, corrosive water may enter into the gap to corrode the outer surface of the pipe body 1. Is prevented.

The exterior ring 11 may have a laminated structure as shown in FIG. In the example shown, the exterior ring
The outer circumference of 11 is formed of a hard material 18, and the inner circumference thereof is formed of a soft material 19. In addition to this, the exterior ring 11 may have a circumferentially continuous shape as shown in FIG. 2 and FIG. 6, or may have a plurality of circumferentially divided shapes. It doesn't matter.

FIG. 7 shows still another embodiment of the tube for propulsion method according to the present invention. In the case of cutting a pipe for propulsion method to make a short pipe, there is a large number of cases where the cut portion is limited to a certain range on the insertion port 3 side. Therefore, in this example, the receiving port 2 side, which is less likely to be cut, has the same structure as the conventional one, that is, the structure in which the filling material 22 is filled between the exterior steel pipe 21 and the pipe body 1 to perform the cutting. The outer ring 11 is fitted only on the side of the insertion port 3 where there is a high possibility of being exposed.

[0022]

As described above, according to the present invention, a plurality of outer rings are fitted on the outer periphery of the tube body portion between the receiving opening and the insertion opening in the tube axial direction. By removing the outer ring from the outer circumference of the pipe body and then cutting only the pipe body, it is possible to easily make a short length of pipe for propulsion method from a pipe for standard length of construction method at the laying site. A pipe for propulsion method suitable for the conditions of the laying site can be obtained by simply using an outer ring of different material, strength, hardness, etc. Moreover, since the outer ring can be easily removed from the tube body, The specifications can be changed easily.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a propulsion method pipe according to an embodiment of the present invention.

FIG. 2 is a perspective view of an exterior ring in FIG.

FIG. 3 is a diagram showing an example of a propulsion method using the propulsion method tube of FIG. 1.

FIG. 4 is a diagram showing another example of a propulsion method using the propulsion method tube of FIG. 1.

FIG. 5 is a view showing another example of the exterior ring together with the entire tube for propulsion method.

FIG. 6 is a view showing still another example of the exterior ring.

FIG. 7 is a diagram showing another example of the propulsion method pipe of the present invention.

FIG. 8 is a partially cutaway front view of a conventional propulsion method pipe.

[Explanation of symbols]

 1 Pipe body 2 Receiving port 3 Inserting port 4 Tube body 7 Exterior part 11 Exterior ring Z Cutting line

Claims (1)

[Claims] 1. A plurality of exterior rings are fitted in the axial direction of the tube on the outer circumference of the tube body between a receiving opening formed at one end and an insertion opening formed at the other end. Tube for propulsion method.