JPH0566478B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a pipe for use in propulsion construction, the outer diameter of which is relatively smaller than the inner diameter, and which can be installed with a relatively small propulsive force. .

BACKGROUND TECHNOLOGY As shown in Fig. 4, a socket-type ductile cast iron pipe body 5
1, in order to facilitate propulsion and protect the outer surface, the outer surface is covered with reinforced concrete or mortar 52 and the outer surface is flush with the outer diameter of the socket. During propulsion, the flange 53 provided at the tip end of the trailing tube is butted against the end surface of the rear end socket of the leading tube that is externally fitted into the insertion portion of the trailing tube to transmit thrust. It's summery. 54 is a mortar lining provided on the inner surface of the pipe body 51, 55 is a watertight rubber ring, 56 is a bolt nut connecting the flange 53 of the trailing pipe and the socket end face of the leading pipe, 57 is a reinforcing rib,
58 is a welded reinforcing bar or wire mesh.

Problems to be Solved by the Invention By the way, in order to make the outer surface flush with the pipe 50, reinforced concrete or mortar 52 is used.
However, if such reinforced concrete or mortar 52 is placed around the outer circumference of the tube body 51 with the same diameter as the outer diameter of the socket, the tube 50 will be received in the socket of the tube body 51 as described above. Receptacle type that fits externally (in such a receptacle type, if the outer diameter of the socket is made smaller, that is, the wall thickness of the socket is made thinner, the maximum outer diameter will be smaller, but the thick part is not strong enough) Therefore, the outer diameter of the tube 50 is necessarily the outer diameter D' ₁ of the tube body 51 plus the height of the socket, and the inner diameter of the tube body 51 is As the outer diameter D′ ₂ of the tube 50 becomes larger relative to D′ ₀ ,
During propulsion, the area subject to resistance due to earth pressure increases. Therefore, a large propulsive force is required during propulsion, and the propulsion equipment must be large-scale, which inevitably increases the cost of propulsion.

Therefore, the technical object of the present invention is to make the outer diameter of the pipe relatively small with respect to the inner diameter of the iron pipe body, so that the area that receives the resistance force due to earth pressure during propulsion can be made as small as possible.

Means for Solving the Problems In order to achieve the above-mentioned technical problems, the present invention provides an insertion part of a pipe for a propulsion method, which has an inner diameter that is approximately equal to the inner diameter of the pipe, and an outer diameter that is approximately equal to the outer diameter of the iron pipe body. A large-diameter cylindrical part that fits into the outer surface of the iron tube on one side of a ring-shaped body that is larger in diameter and approximately equal to the tube, and a iron tube whose inner diameter is approximately equal to the inner diameter of the tube and whose outer diameter is on the other side. A rigid collar having a small-diameter cylindrical portion serving as an insertion port smaller than the outer diameter of the pipe is integrally provided, and the socket portion of the tube is formed such that the outer diameter of the main body of the rigid collar is approximately equal to the outer diameter of the socket portion. It is characterized by being formed as follows.

Effect By adopting the technical means described above, the socket will fit externally into the small diameter cylindrical part of the rigid collar, so the inner diameter of the socket will be made smaller than the outer diameter of the iron pipe body. Even if the inner diameter of the pipe is the same as that of a conventional pipe (and the socket height is also the same), the outer diameter of the socket is correspondingly smaller than that of a conventional pipe.In other words,
It is possible to obtain a tube shaped like a tube in which the difference between the outer diameter of the iron tube body and the outer diameter of the socket is smaller than that of conventional tubes. In other words, the outer diameter of conventional pipes was the outer diameter of the iron pipe body plus the height of the socket, but the pipe of the present invention has an outer diameter of the outer diameter of the small diameter cylindrical part of the rigid collar plus the height of the socket. The outer diameter of the iron tube can be made relatively smaller than the inner diameter of the iron tube.

Effects of the Invention As described above, according to the present invention, during propulsion, it is possible to fit the socket of the leading pipe into the small diameter cylindrical portion of the collar, which has an outer diameter smaller than the outer diameter of the iron pipe body of the trailing pipe. Therefore, compared to conventional pipes in which the socket of the leading pipe is fitted onto the outer surface of the iron pipe body of the trailing pipe, the outer diameter of the iron pipe body can be made relatively small compared to the inner diameter of the iron pipe body, and the soil The area subject to the resistance force due to pressure can be made as small as possible, the propulsive force during propulsion can be relatively small, and therefore the propulsion equipment can be small in scale.In addition to being economical, the collar is integrated. The large-diameter cylindrical part can be inserted into the outer surface of the steel pipe body during the process, making it easier to work with.Furthermore, there is no need for flanges or reinforcing ribs like in conventional propulsion method pipes, so the structure is simple. and easy to manufacture. In addition, the amount of reinforced concrete or mortar required for the exterior is smaller than that of conventional pipes, resulting in excellent effects such as the ability to reduce the weight of the pipe.

Embodiment In FIG. 1, reference numeral 10 is a pipe for the propulsion method in which the outer surface of a steel pipe body 11 is covered with reinforced concrete or mortar 12, and the outer surface is formed flush with the outer diameter of the socket. A rigid collar 13 is integrally provided in the section. The collar 13 is made of iron, for example, similar to the tube body 11, and its surface is coated with a coating film 1 using a powder coating method or the like to prevent rust.
4 has been applied. 15 is a ring-shaped main body of the collar 13, the inner diameter of this main body 15 is approximately equal to the inner diameter D' ₀ of the tube 50, and the outer diameter is the outer diameter D' ₂ of the tube 50,
That is, it is smaller than the outer diameter D' ₁ of the tube body 11 plus the height of the socket. A large diameter cylindrical portion 17 is provided on one side of the main body 15 and is fitted into the outer surface of the tube body 11 by press fitting, screwing, etc., and on the other side, the inner diameter D ₃ is set to the inner diameter D ₀ of the tube 10 (D ₀ = D′ ₀ ), and the outer diameter D ₄ is approximately equal to the outer diameter D ₁ (D ₁ =
D′ ₁ ) A small diameter cylindrical portion 18 is provided which serves as a smaller insertion port. The collar 13 has a large diameter cylindrical portion 17,
After the main body 15 is fitted into the outer surface of the tube 11 so that one side is in contact with the tip of the tube 11, the tip is welded to the tube 11 to be integrally fixed.

On the other side of the main body 15, the surface outside the small-diameter cylindrical portion 18 is formed into a thrust transmission portion 20.

Further, the outer diameter of the socket 22 portion of the pipe 10 is equal to that of the main body 1.
It is formed to be approximately equal to the outer diameter of No. 5. 23 is a mortar lining, and 24 is a welded reinforcing bar or wire mesh, which are the same as in the conventional case. 25 is a watertight rubber ring interposed between the inner surface of the socket 22 and the outer surface of the small diameter cylindrical portion 18 of the collar 13.

The outer diameter D ₂ of the tube 10 is the outer diameter D′ ₂ of the conventional tube 50.
It is smaller and approximately equal to the outer diameter of the body 15 of the collar 13 and the outer diameter of the socket 22 portion, and the inner diameter D ₀ of the tube 10 is approximately equal to the inner diameter D' ₀ of the conventional tube 50.

When connecting the pipe 10, the rear end socket 22 of the leading pipe and the small diameter cylindrical part 18 of the collar 13, which serves as the distal end socket of the trailing pipe, are connected via the rubber ring 25. The connected pipe 10 transmits thrust from the thrust transmitting portion 20 of the collar 13 of the trailing pipe to the end face of the socket 22 of the leading pipe that abuts against it.

In the above-mentioned propulsion method pipe 10, the collar 1 is used to transmit thrust from the trailing pipe to the leading pipe.
Since the socket 22 is fitted externally into the small diameter cylindrical part 18 of No. 3, the inner diameter of the socket 22 is set to the outer diameter of the tube body 11.
In _other words, even if the inner diameter of the pipe is the same as the conventional pipe 50 (and the height of the socket 22 is also the same), the outer diameter of the socket 22 is correspondingly smaller than that of the conventional pipe 50. , it is possible to obtain a tube 10 having a tubular shape in which the difference between the outer diameter D ₁ of the tube body 11 and the outer diameter of the socket 22 is smaller than that of the conventional tube 50 . That is, in the conventional tube 50, the outer diameter D' ₂ is equal to the outer diameter D' ₁ of the tube body 51.
However, the tube 10 has an outer diameter D ₂ of the small diameter cylindrical portion 18 of the collar 13.
The height of the socket 22 _is added to the outer _{diameter D 4} of Can be made smaller. Therefore, the area subject to resistance due to earth pressure during propulsion becomes smaller. Therefore, it is sufficient for the propulsive force to be large enough to overcome the resistance. Also, the amount of reinforced concrete or mortar 12 required for the exterior is less than for conventional pipes 50.

Furthermore, the pipe 10 as described above is pipe-in.
If used in the pipe construction method, it becomes possible to install a new pipe that has an inner diameter closer to that of the existing pipe, and it can also be used as a pipe for pipe-in-pipe construction.

FIG. 2 shows another embodiment, which differs from the previous embodiment in the thrust transmission means.
That is, a circumferential groove 31 is formed on the outer surface of the small diameter cylindrical portion 18 between the rubber ring 25 and the main body 15 of the collar 13, and a circumferential groove of approximately the same width is formed on the inner surface of the tip of the socket 22 facing the circumferential groove 31. 32 is formed, and a lock ring 33 having a notch 33a in a part of the circumference is fitted between these circumferential grooves 31 and 32 as shown in FIG. A plurality of set bolts 35, which are fixed by pressing toward the side, are screwed into screw holes 36 drilled at positions in the circumferential groove 32 at the tip of the socket 22. To fit the lock ring 33 into the circumferential grooves 31 and 32, first expand the diameter of the lock ring 33 into the circumferential groove 32 before connecting the leading pipe and the trailing pipe, and then insert the lock ring 33 into the circumferential groove 32. After the connection, tighten the set bolt. 35 to press the ring toward the circumferential groove 31 side,
This enables engagement between the lock ring 33 and the collar 13 during thrust transmission. The other configurations are the same as those of the previous embodiment.

Therefore, in this embodiment, the locking ring 33
The thrust of the trailing tube is transmitted to the leading tube through. In the case of thrust transmission using the lock ring 33, separation of the joint portion of the pipe 10 after installation is prevented.

It goes without saying that the structure of the collar 13 shown in each of the above embodiments is merely an example, and other designs may be used without changing the gist.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention, FIG. 2 is a longitudinal sectional front view showing another embodiment, and FIG.
The figure is a side view of the lock ring, and FIG. 4 is a longitudinal sectional front view showing a conventional example. 10...Pipe for propulsion method, 11...Iron pipe body, 1
2...Reinforced concrete or mortar, 13...
Rigid collar, 15... Ring-shaped main body, 17... Large diameter cylindrical part, 18... Small diameter cylindrical part, 20... Thrust transmission part, 22... Socket, 32... Lock ring.

Claims (1)

[Scope of Claims] 1. A propulsion method in which the outer surface of a steel tube having a widened socket at one end and an inlet at the other end is coated with reinforced concrete or mortar, except for the socket. In the pipe, the insertion part of the pipe 10 for the propulsion method is a ring-shaped body whose inner diameter is approximately equal to the inner diameter of the pipe 10 and whose outer diameter is larger than the outer diameter of the iron pipe body 11 and substantially equal to the pipe 10. A large-diameter cylindrical portion 17 that fits into the outer surface of the iron tube 11 is provided on one side of the tube 15, and an insertion hole whose inner diameter is approximately equal to the inner diameter of the tube 10 and whose outer diameter is smaller than the outer diameter of the iron tube 11 is provided on the other side. Small diameter cylindrical part 1
8 is integrally formed, and the socket portion of the tube 10 is formed such that the outer diameter of the main body 15 of the rigid collar 13 and the outer diameter of the socket 22 portion are approximately equal. A pipe for the propulsion method, which is characterized by: