JP3003756B2 - Corrosion protection structure at the pipe end - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end corrosion prevention structure at a pipe connection.

[0002]

2. Description of the Related Art Conventionally, when a metal pipe is connected to form a pipeline, a predetermined length of a prepared metal pipe is cut, and the metal pipes are butted and a collar or a connecting ring is attached to an outer periphery thereof. In some cases, they are fitted and connected. In this case, the metal surface is exposed at the end face of the metal tube, which may cause corrosion by the internal fluid.To prevent this, conventionally, anti-corrosion paint such as one-component epoxy paint is applied on the exposed metal part in the field. To be done.

[0003]

However, in the case of the above-mentioned application, it is necessary to wait until the anticorrosive paint is hardened, and there is a drawback that it takes a long time to connect the pipes. In some cases, there was a defect that reliability of long-term anticorrosion performance was lacking. Further, in a cold area, the coating material is hard to be hardened, the workability is further deteriorated, and the reliability of the anticorrosion performance is problematic.

However, in order to solve such a problem, as shown in FIG. 3, a ring member C1 made of an elastic material is provided on an end face A1 of a metal tube A via a sponge-like ring member B.
And an end face anticorrosion rubber C composed of a short cylindrical body C2 extending along the inner surface of the metal tube A from the inner surface of the ring body C1,
Means for preventing corrosion of the end face by this has been proposed and implemented, but in this case, there is no problem if the cut end face is smooth, but usually this cut is not necessarily a flat face because it is performed on site, Since it is difficult to bring the sponge-shaped ring body B into close contact with the irregularities, there is a problem that the fluid in the pipe penetrates into the gap and causes corrosion on the pipe end face.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention eliminates the need for anticorrosion coating when connecting cut metal pipes, enables quick connection work, and improves the reliability of anticorrosion. The object of the present invention is to provide a pipe end anticorrosion structure at a high pipe connection portion.

[0006]

That is, according to the present invention, there is provided a pipe end anticorrosion structure in a pipe connecting portion, which comprises a cut end face A1 of a metal pipe A.
An end surface anticorrosion rubber comprising a ring body 1A made of an elastic material applied to the end surface A1 of the metal pipe A, and a short cylindrical body 1B extending along the inner surface of the metal pipe A from the inner surface of the ring body 1A. 1 is abutting an insoluble gel-like material between said ring body 1A and the cut end surface of the metal tube is to the Tokute' to become filled.

[0007]

Next, an embodiment of the present invention will be described. FIG. 1 is a sectional view showing an embodiment of the method of the present invention, and FIG. 2 is a sectional view showing a connection state.

[0008] The pipe end anticorrosion structure in the pipe connecting portion of the present invention comprises a cut end face A1 of a metal pipe A and a pipe end face A of the metal pipe A.
When the end face anticorrosion rubber 1 consisting of a ring body 1A made of an elastic material applied to the base member 1 and a short cylinder rest 1B extending along the inner surface of the metal pipe A from the inner surface of the ring body 1A, the ring body is contacted. 1A and the cut end face A1 of the metal tube are filled with an insoluble gel substance 2.

In the above-described embodiment, the connection of the metal pipe A can be similarly performed in the case of connection to a receptacle (not shown) in addition to the connection by the collar joint 3 as shown in FIG. In the drawing, reference numeral 4 denotes a split ring that presses the short cylinder 1B against the inner surface of the metal tube A, and is inserted as necessary depending on the material of the short cylinder 1B.

[0010]

In the pipe end anticorrosion structure of the pipe connection portion of the present invention, the space between the ring body 1A and the pipe end face is filled with the gel-like substance 2, so that even if the metal pipe end face has some irregularities, a gap is formed. Will not occur. On the other hand, since the short cylindrical body 1B extending to the inner surface of the metal tube is provided on the inner surface of the ring body 1A,
The filled gel-like substance 2 does not leak into the tube, and it is not necessary to wait for the tube to be connected until these are dried.

[0011]

As described above, according to the pipe end anticorrosion structure of the present invention, when the metal pipe is cut and connected, the pipe end anticorrosion operation is completed only by the filling operation of the gel material. However, it is possible to completely eliminate the trouble of waiting for the paint to cure or to pay attention to uniform coating, thereby simplifying the pipe connection operation and improving the reliability of the anticorrosion performance.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a pipe joint portion when the method of the present invention is performed.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 A: Metal tube A1: Cut end face 1A: Ring body made of elastic material 1B: Short cylindrical body 1: End face anticorrosion rubber 2: Insoluble gel-like substance

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 58/18

Claims (1)

(57) [Claims] 1. A ring body 1 made of an elastic material and applied to a cut end face A1 of a metal tube A on the cut end face A1 of the metal tube A.
A and, the ring member along the metal tube A inner surface from the inner surface the end face corrosion rubber 1 abutment is made of a short tube bodies 1B extending in 1A
Is, the pipe end anticorrosive structure in the tube connecting portion gelatinous substance insoluble to Tokute' to become filled between the ring body 1A and the cut end surface of the metal tube.