JP4889433B2 - Piping repair method and pipe joint repair structure - Google Patents

Description

The present invention relates to a pipe repair method for repairing a gap generated in a pipe such as a supply pipe for supplying coal pulverized to a boiler in a power plant or the like, and a pipe joint repair structure .

  In a power plant or the like, powdered coal pulverized by a pulverizer is supplied to a boiler as fuel through a pipe formed by joining a plurality of steel pipes. Such piping may be expanded or deformed by the heat of the boiler, and the expansion or deformation may cause a gap at the joint between the piping. As described above, when a gap occurs in the piping, replacement work is necessary, but the replacement work can be performed only when the power plant is stopped. However, since powdery coal may leak from the gap before the replacement work, it is necessary to close the gap by some method as soon as the gap occurs. Conventionally, as a method of closing the gap, a method of filling the caulking material having adhesiveness into the gap generated in the pipe has been used.

  However, in the above method, since the caulking material has strong adhesiveness, it is difficult to completely remove the caulking material adhering to the pipe, and there is a problem that the caulking material stuck to the pipe becomes an obstacle to the replacement work. . Further, since the caulking material is a relatively expensive material, the repair work becomes costly.

The present invention has been made in view of the above problems, and an object thereof is to provide a pipe repair method and a pipe joint repair structure that can be carried out at low cost without being an obstacle at the time of replacement work. It is in.

A method of repairing a pipe of the present invention is a method for repairing the piping, the pipe is formed by joining a plurality of steel pipes, the junction of the steel pipes covers the joint portion from the outer peripheral side a packing which is mounted as a ring-shaped housing part provided is provided so as to surround the packing, so as to cover the inter-gap occurring at the junction of the pipe, and the rope-like fiber material, wherein There the repair material comprising the water glass impregnated to the fiber material is addressed, the fibrous material, in advance, and processed as frayed fibers occurs, the repair material, enters the frayed fibers of the fiber material Thus, it is applied to the gap .

  According to the above repair method, water glass is viscous at room temperature, but has the property of solidifying by losing moisture, so the gap is closed by applying it so as to cover the gap or crack in the pipe at room temperature. In the case of packing replacement work, etc., the solidified water glass can be easily peeled off, so there is no obstacle to the replacement work. Moreover, since water glass is cheaper than a conventionally used caulking material, the cost can be reduced.

The repair structure of the joint portion of the pipe according to the present invention is a repair structure of the joint portion of the pipe formed by joining a plurality of steel pipes, and is attached so as to cover the joint portion between the steel pipes from the outer peripheral side. A ring-shaped housing portion provided so as to surround the packing, a rope-shaped fiber material applied to cover a gap generated in a joint portion between the steel pipes, and water glass soaked in the fiber material The repair material is processed in advance so that frayed fibers are generated, and the repair material is applied to the gap so that the frayed fibers enter. And

  According to the present invention, the water glass is viscous at room temperature, but has the property of solidifying when water is lost, so the water glass contained in the repair material applied to cover the gaps in the piping is the heat of the boiler. By losing moisture and solidifying, gaps or cracks in the piping can be completely closed. Moreover, the water glass solidified at the time of replacement work can be easily peeled off, and does not hinder the restoration work. Moreover, since the water glass of the present invention is inexpensive, it can be repaired at low cost.

Hereinafter, an embodiment of a pipe repair method and a pipe joint repair structure according to the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a pipe 10 to which a pipe repair method according to this embodiment is applied. As shown in the figure, a pipe 10 is provided so as to connect a pulverizer 11 for pulverizing coal and a boiler 12, and is used for supplying powdered coal pulverized by the pulverizer 11 to the boiler 12. is there. The pipe 10 is formed by a plurality of steel pipes 18 joined by a joining structure 20 described later. In the boiler 12, since the supplied fine powdery coal is burned as fuel, the temperature of the pipe 10 reaches about 80 to 100 ° C. from the heat of the boiler 12.

2A and 2B are diagrams showing a joint portion between the steel pipes 18, in which FIG. 2A is a front view of the joint portion, FIG. 2B is a cross-sectional view taken along line II ′ in FIG. It is II-II 'sectional drawing in this. As shown in the figure, the steel pipe 18 has a packing 16 attached so as to cover the joint portion between the steel pipes 18 from the outer peripheral side, and a ring-like shape in which one place provided so as to surround the packing 16 is broken. The housing 13 is connected by a joint structure 20 including a bolt 14 and a nut 15 that are attached so as to connect a split portion of the housing 13. By tightening the bolts 14 attached to the housing 13, the housing 13 is tightened, whereby the packing 16 is pressed against the joint portion of the steel pipe 18, so that the gap can be closed.

  Here, since the pipe 10 reaches a high temperature due to the heat of the boiler 12 as described above, the steel pipe 18 and the housing 13 are expanded and deformed. When members constituting the joint structure 20 such as the steel pipe 18 and the housing 13 expand and deform, the members constituting the joint structure 20 may be displaced from each other, and a gap may be generated at the joint portion of the steel pipe 18. When such a gap is generated, finely pulverized coal leaks out of the gap, so that the deformed member needs to be replaced. However, since the replacement work cannot be performed unless the power plant is stopped, it is necessary to close the gap by some means until then.

  As shown in FIG. 3, the pipe repair method according to the present embodiment includes a repair material 17 composed of a rope and water glass soaked in the rope so as to cover a gap generated in the pipe 10. By applying, the gap is closed. The repair material 17 can be easily prepared by filling a container with water glass at room temperature and throwing a rope into the container.

  Since water glass is a viscous liquid at room temperature, it is difficult to handle water glass alone as a repair material, but in this embodiment, it is soaked in a fiber material such as a rope, so it can be handled easily. it can. In addition, water glass has a property that when exposed to high temperatures, water evaporates and solidifies.

  A rope having a diameter of about 30 mm is suitable, and as such a rope, for example, Ceratech rope manufactured by Hontes Kogyo Co., Ltd. can be used. Further, the rope may be frayed in advance by a method such as scratching the fiber before soaking the water glass.

  When the repair material 17 is applied so as to cover the gap, the water glass is deformed in accordance with the shape of the gap generated in the pipe 10. Moreover, the loose fiber of the rope enters the gap, and water glass can be filled into the gap. In this way, the gap can be closed by the repair material 17. Further, since the pipe 10 is heated to a high temperature by the heat of the boiler 12, moisture contained in the water glass of the repair material 17 applied to the gap evaporates, and the water glass is solidified in a state where the gap of the pipe 10 is closed. To do.

  In the conventional method, the gap is covered by covering the gap with a coking material having adhesiveness. However, since such a caulking material has a strong adhesive force, it sticks to the steel pipe 18, and it takes much time to remove the stuck caulking material, or the caulking material cannot be completely removed. There has been a problem that it becomes an obstacle to replacement work of members.

  On the other hand, the water glass used in the repair method of the present embodiment has a property of solidifying by the heat of the pipe 10 as described above, and the pipe 10 reaches a high temperature by the heat of the boiler 12 and is solidified. To do. The solidified water glass can be easily peeled off, and even after being peeled off, it does not stick to the steel pipe 18 or the like.

As described above, according to the pipe repair method and pipe joint repair structure of the present invention, the solidified water glass can be easily peeled off, so that the member replacement operation can be performed smoothly. . Moreover, since water glass can be obtained at a lower price than caulking material, the cost for repair work can be reduced.

In addition, although this embodiment demonstrated as an example the case where the clearance gap produced in the junction part of steel pipes was repaired, it is not restricted to this, The repair method of the piping of this invention is a case where the crack arises in the piping 10, etc. Can also be used.
In this embodiment, the rope is soaked with water glass. However, the present invention is not limited to this, and the rope may be a fibrous material soaked with water glass and may be a member that can be applied to the gap. That's fine.

It is a figure which shows the piping used as the object of the application of the repair method of the piping leak part of this embodiment. It is a figure which shows the junction part of piping for supply in piping, The figure (A) is sectional drawing of piping, (B) is II 'sectional drawing in (A), (C) is It is II-II 'sectional drawing in (B). It is a figure for demonstrating the repair method of the piping 10 of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Piping 11 Crusher 12 Boiler 13 Housing 14 Bolt 15 Nut 16 Packing 17 Rope 18 Steel pipe 20 Joining structure

Claims (2)

A method of repairing piping,
The pipe is formed by joining a plurality of steel pipes,
The joint portion between the steel pipes is provided with a packing attached so as to cover the joint portion from the outer peripheral side, and a ring-shaped housing portion provided so as to surround the packing,
Applying a repair material consisting of a rope-like fiber material and water glass soaked in the fiber material so as to cover the gap generated in the joint portion of the pipe,
The fiber material is pre-processed to produce frayed fibers;
A repair method for piping, wherein the repair material is applied to the gap so that the loose fibers of the fiber material enter. A repair structure of a joint portion of a pipe formed by joining a plurality of steel pipes,
A packing attached so as to cover the joint between the steel pipes from the outer peripheral side;
A ring-shaped housing portion provided so as to surround the packing;
A repair material consisting of a rope-like fiber material and water glass soaked in the fiber material, applied so as to cover the gap generated in the joint between the steel pipes,
The repair material is a repair structure for a joint portion of a pipe, wherein the repair material is processed in advance so that frayed fibers are generated, and is applied to the gap so that the frayed fibers enter. .

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