JPH0743072B2 - Method for stopping red water in lining pipes by welding connecting lining pipes lined with organic material - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to a red water method for a pipe line in which a lining pipe lined with an organic material such as a resin is connected by welding to a pipe joint for welding, and particularly to an organic substance. A pipe made of a metal material having an inner coating for corrosion protection by a material or an inner lining for corrosion protection by an organic material, for example, a hard vinyl chloride lining steel pipe for water supply or hot water supply, a resin lining pipe such as a polyethylene powder lining steel pipe, and an anticorrosion coating The present invention relates to a method for stopping red water in a pipeline in which a lining steel pipe lined with an organic material is connected to a welding pipe joint by welding.

(B) Conventional technology Generally, in a water pipe in a structure such as a building or a ship, in order to prevent generation of red water or the like due to corrosion of the inner surface, for example, coal tar enamel coating is applied to the inner surface. ,
Steel pipes coated with rust such as asphalt coating, hard vinyl chloride lining, polyethylene powder lining, or rust lining are used.

When laying, for example, a water pipe using these steel pipes, the steel pipe is cut into a predetermined length, each cut pipe end is threaded, and the pipe end is screwed into, for example, a pipe joint. Work is done.

(C) Problems to be solved by the invention However, such a twisting work requires a large-scale cutting device, especially for a large-diameter lining pipe,
In addition, connecting the joints is also a big problem, which is a problem.

Moreover, the area of the cut surface of the pipe, that is, the pipe end, becomes large,
The anticorrosion work becomes troublesome, and the efficiency of the pipe laying work cannot be achieved.

Also, for lining pipes with a small diameter, even if the anticorrosion joint is used, the anticorrosion effect varies depending on the screw accuracy, so high threading precision is required to enhance the anticorrosion effect. This is a problem because it takes a lot of time and effort to manage the thread cutting machine, such as the number of times the die of the machine is changed.

Therefore, an object of the present invention is to completely eliminate the problems associated with the conventional lining pipe lined with an organic material, that is, the pipe end anticorrosion method of the lining pipe.

(2) Means for Solving the Problems The present invention is capable of easily and easily connecting the pipes of the lining pipe by welding, and at the same time, can reliably prevent corrosion of the pipe end of the lining pipe and generate red water. Even if it stops easily even if the new lining pipe is welded, the method of stopping the red water of the pipeline is provided.

That is, the present invention is a method for stopping red water in a lining pipe, wherein each of the connecting ends of a plurality of lining pipes lined with an organic material is welded at least liquid-tightly to the connecting end of a pipe joint, and the lining pipe is welded. Two discs made of a touch-resistant material, in which a hole penetrating the pipe joint wall is formed in the formed pipe joint, and a screw hole for mounting and tightening an anode electrode is provided in the through hole, and the two discs. Insert the plug body that is sandwiched between the discs and has the cylindrical body of the rubber bag that has the anode electrode mounting hole and the tightening screw hole, and insert the anode into the anode electrode mounting hole of the plug body. Then, a screw is screwed into the tightening screw hole of the plug body to compress the rubber cylindrical body of the plug body, and the compression of the cylindrical body causes a gap between the through hole wall and the cylindrical body of the rubber bag. In addition to sealing the liquid tightly between the anode and the cylinder, hold the anode in the rubber cylinder. , The anode end is exposed in the pipe joint, the cathode is connected to the lining pipe wall, and when red water is produced, the generation of red water is stopped by applying an anticorrosion potential between the anode and the cathode. There is a method of stopping red water in a lining pipeline, in which a plurality of lining tubes lined with an organic material are welded and connected.

In the present invention, the lining pipe connection end and the connection end of the welding pipe joint connected thereto by welding are welded at least liquid-tightly, that is, are welded all around. For welding in this case,
Common welding techniques used to weld weld joints can be used. At the time of this welding, the organic material of the lining layer deteriorates and is easily peeled off, and mixes in water during use.
It is preferable to remove it with a cutter or the like.

In the present invention, in order to perform galvanic protection of the lining pipe in the lining pipe and the pipe end portion of the welding pipe joint connected thereto by welding, the electrode member, particularly the through hole for mounting the anode electrode, is the lining pipe. Is formed on the wall of a welded pipe joint connected by welding. In this case, in the present invention, the through hole formed in the welding pipe joint is
Formed after welding. In order to perform insulation and liquid-tight sealing between the anode electrode and the wall of the through hole in the through hole, the periphery of the anode electrode material is surrounded by an insulating material to form an electrode seal structure.

In this case, the electrodes and the insulators may be separately attached, but a packing member is provided around the electrodes in advance to form an electrode sealing structure, and the electrodes are formed in a plug shape so as to be fitted into the through holes. This is preferable because the work of attaching the anode of the anticorrosion pipe joint is simple and easy.

Examples of the anode electrode portion used in the present invention include a corrosion resistant anode member at one end, for example, a hot water storage tank, a platinum-coated titanium electrode used in a cathodic protection technique for the inner surface of a boiler, and the like.

Further, in the present invention, in order to electrically insulate the corrosion resistant anode electrode member from the wall of the through hole, and to seal the periphery of the anode electrode member, an insulating material having excellent elasticity is arranged. As such an insulating material, any electrically insulating material can be used as long as it is water resistant and water impermeable. However, an elastic material such as rubber or a plastic adhesive, which is excellent in hermeticity, is preferable in terms of sealing and the like.

(E) Action The present invention relates to a corrosion-resistant material in which a hole penetrating a pipe joint wall is formed in a pipe joint welded to a lining pipe, and an anode electrode mounting hole and a tightening screw hole are provided in the through hole. Made of two discs and a rubber-made cylindrical body sandwiched between the two discs and provided with an anode electrode mounting hole and a tightening screw hole, Insert the anode into the anode electrode mounting hole of the body, screw the screw into the tightening biz hole of the plug body, compress the rubber cylinder of the plug body, and compress the cylinder body to form the through hole. Liquid-tightly seal between the wall and the cylinder made of rubber and between the anode and the cylinder, hold the anode in the cylinder made of rubber, expose the anode end in the pipe joint, and When the cathode is connected and red water is produced, an anticorrosion potential is applied between the anode and the cathode, so when red water is produced,
The electrode inserted in the through hole is connected to the anode, the pipe part is connected to the cathode, and the anticorrosion potential between these anode and cathode, for example, the potential of the cathode is -770 mv (SCE) at the saturated sweet potato electrode potential.
It is possible to stop the generation of red water by setting a potential such that As described above, by loading the anticorrosion potential when red water is generated without constantly applying the anticorrosion potential, it is possible to stop the corrosion of the pipe end of the welding pipe joint and stop the red water.

Thus, according to the present invention, when the lining pipe is connected, the metal of the connecting portion is exposed, but since the electrocorrosion is performed through the electrode inserted in the through hole, not only the metal of the connecting portion, but also the joint. Corrosion on the inner surface is prevented, clean water is always available, and red water does not bother you.

Further, according to the present invention, not only for large-diameter lining pipes, but also for small-diameter lining pipes, with simple work,
The pipe connection can be made and the red water can be prevented or stopped.

(F) Example Hereinafter, one embodiment of an embodiment of the anticorrosion pipe joint of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the following description and examples.

FIG. 1 is a schematic side cross-sectional view mainly showing a connecting portion in one embodiment of the present invention, showing an example applied to an L-shaped pipe joint.

In the figure, an L-shaped welding joint 1 is provided with pipe connection portions 2 and 3, and its inner surface is not lined. Therefore, at that time, due to the progress of corrosion over the years, rust is formed on the inner surface, which causes red water.

In this example, the lining pipes 4 and 5 are welded to the pipe connecting portions 2 and 3 of the welded pipe joint 1, respectively, but prior to welding, the lining layers 6 and 7 are attached to the pipe end surfaces of the lining pipes 4 and 5. From 8 and 9 to predetermined areas 10 and 11,
Removed by vine.

When the entire circumference connection between the lining pipes 4 and 5 and the pipe connection portion of the welded pipe joint 1 is completed, the outer curved portion of the welded pipe joint 1
A through hole 14 is formed in the wall 13 of 12. The through hole 14 is formed in one place of the wall 13 of the outer curved portion 12 of the welded pipe joint portion 1 by using, for example, an electric drill. The formation of this hole 14 is
The tapered shape that opens inward of the welded pipe joint
When the plug body 16 holding the anode electrode 15 is fitted into the hole 14,
It is preferable because it has an effect of preventing the stopper 16 from coming off. The positions of the holes 14 formed in the welded fitting 1 are preferably positions where the distances from the tube ends 8 and 9 of the lining tubes 4 and 5 to the anode electrode 15 are substantially the same, but the positions are slightly deviated. There is no problem even if the anode electrode 15 is attached by making a hole in it.

The plug 16 is a short solid cylinder made of an electrically insulating material such as rubber.
17 and two circular plates 18 and 19 made of a touch-resistant material such as stainless steel and having substantially the same diameter, which are attached to the upper and lower ends of the cylindrical body, respectively.
And are formed. The cylindrical body 17 and the disks 18 and 19 have screw holes 20 and 21 for fastening and an anode electrode, respectively.
Fifteen mounting holes 22 are formed. Outside disk 18
May be formed to be larger than the inner disc 19 and larger than the through hole 14 formed in the welded pipe joint wall 13, and further sealed by an electrically insulating adhesive or the like.

The plug body 16 formed in this manner inserts the cylinder body 17 into the through hole 14 of the welded pipe joint wall 1 and screws the screws 23 and 24 to compress the cylinder body 17 in the axial direction. Then, by swelling in the lateral direction, that is, in the direction of the outer curved wall 13 of the welded pipe joint 1,
It can be fixed to the welded pipe joint 13.

The plug body 16 is fixed to the outer curved wall 13 of the welded pipe joint 1, and the connection terminal 25 of the anode electrode 15 is connected to a constant voltage power source (not shown). On the other hand, the cathode (not shown) is connected to a part of the wall of the lining tube. When attaching electrodes for cathodic protection to multiple pipe joints, connect the connection end 25 of the anode electrode 15 of each pipe joint to one conductor wire, and connect this conductor wire to a DC constant voltage power supply. The circuit can be simplified.

In this example, with respect to the anode provided in the welded pipe joint of the lining pipe thus connected, the cathode connected to one of the lining pipe walls is applied with a cathode-side potential of −770 mv (SCE) to generate electric power. Corrosion can be prevented, and corrosion of the metal surface exposed during welding work can be prevented.

In this example, the lining pipe is connected via an L-shaped pipe joint, but instead of the L-shaped pipe joint of this example, a branch pipe joint,
A register can be used, and a non-lined tube can be used.

(G) Effect of the Invention According to the present invention, the pipe joint welded to the lining pipe is provided with a hole penetrating the pipe joint wall, and the anode electrode mounting hole and the tightening screw hole are provided in the through hole. By attaching a plug body provided with a rubber cylindrical body sandwiched between two circular plates made of a corrosion-resistant material and the two circular plates and provided with an anode electrode mounting hole and a screw hole for tightening Inserting the anode into the anode electrode mounting hole of the stopper, screwing a screw into the tightening screw hole of the stopper, compressing the rubber cylinder of the stopper, and compressing the cylinder, Liquid-tightly seal the space between the through-hole wall and the rubber cylinder and the space between the anode and the cylinder, and hold the anode in the rubber bag cylinder to expose the anode end in the pipe joint and lining. When the cathode is connected to the tube wall and red water is produced, a corrosion protection potential is applied between the anode and the cathode to stop the red water. Even if the connection of the lining pipe, which was originally a threaded pipe joint, was replaced by a welding connection, the generation of red water could be easily stopped when the red water was generated, and the connection of the lining pipe by welding would be possible by solving the problem of red water. Compared with the conventional connection method, not only the connection of large-diameter lining pipes, but also the connection of small-diameter lining pipes, the work contents are standardized, and it is possible to improve work efficiency. Moreover, it has excellent corrosion resistance.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of one embodiment of the present invention, showing an example applied to an L-shaped pipe joint. Regarding the reference numerals in the drawings, 1 is an L-shaped welded pipe joint, 2 and 3 are pipe welded parts, 4 and 5 are lining pipes, 6 and 7 are lining layers, 8 and 9 are pipe end faces, and 10 and 11 are predetermined regions. , 12
Is an outer curved portion of the welded pipe joint, 13 is a wall of the outer curved portion, 14 is a through hole, 15 is an anode electrode, 16 is the whole, 17 is a cylindrical body, 18 and
Reference numeral 19 is a disk, 20 and 21 are screw holes, 22 is a mounting hole, 23 and 24 are screws, and 25 is a connection terminal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Isoda 3-6-18 Shibaura, Minato-ku, Tokyo Nishihara Sanitation Co., Ltd. (56) References JP-A-54-116731 (JP, A) 51-103015 (JP, U)

Claims (1)

[Claims] 1. A method for stopping red water in a lining pipe, wherein each of the connecting ends of a plurality of lining pipes lined with an organic material is welded to a connecting end of a pipe joint in a liquid-tight manner. A hole that penetrates the pipe joint wall is formed in the pipe joint, and the anode electrode mounting hole and the screw hole for tightening are provided in the through hole. Insert a plug body that is sandwiched between discs and has a rubber cylindrical body that is provided with screw holes for mounting and tightening the anode electrode, insert the anode into the anode electrode mounting hole of the plug body, and A screw is screwed into the tightening screw hole of the stopper to compress the rubber cylinder of the stopper, and the compression of this cylinder causes
Liquid-tightly seal the space between the through-hole wall and the rubber cylinder and the space between the anode and the cylinder, hold the anode in the rubber cylinder, and expose the anode end in the pipe joint to form a lining pipe. Weld a plurality of lining pipes lined with an organic material characterized by stopping the generation of red water by connecting a cathode to the wall and applying an anticorrosive potential between the anode and cathode when red water is produced. How to stop the red water of the connecting lining pipeline.