JP4318376B2 - Disposal of unnecessary existing pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for disposing of unnecessary existing pipes that have become unnecessary after the replacement of new pipes.
[0002]
[Prior art]
Conventionally, unnecessary existing pipes that became unnecessary after switching to new pipes were quickly excavated and removed from the soil by the usual open-cut method.
[0003]
[Problems to be solved by the invention]
Even now that shallow layer burial is possible due to deregulation, according to the above-mentioned conventional disposal method of unnecessary existing pipes, new pipes were buried deeply during replacement work in which shallow pipes were buried and replaced. Since it was necessary to remove unnecessary existing pipes, it was necessary to deepen the pipes in the end, and although the new pipes could be buried in shallow layers, the effect of reducing drilling costs could not be expected.
[0004]
Accordingly, an object of the present invention is to provide a method for disposing of unnecessary existing pipes that eliminates the above-mentioned problems and can dispose of unnecessary existing pipes without deep drilling to reduce excavation costs.
[0005]
[Means for Solving the Problems]
〔Constitution〕
As illustrated in FIG. 1, the characteristic configuration of the invention of claim 1 is that the unnecessary existing pipe 1 is removed from the unnecessary existing pipe 1 by removing the unnecessary existing pipe 1 by the corrosion promoting means 3 for accelerating the corrosion of the pipe while leaving it in the soil. In the method of disposing of unnecessary existing pipes that cause the pipe 1 to undergo corrosion decomposition at an early stage, as the corrosion accelerating means 3, a base metal is formed by a battery action that is formed between the two metals when metals having different potentials are electrically connected in the soil. By adopting macro cell corrosion, which is corroded, the corrosion of the unnecessary existing pipe 1 is promoted .
[0006]
[0007]
As illustrated in FIG. 2, the characteristic configuration of the invention of claim 2 is that the unnecessary existing pipe 1 is removed from the unnecessary existing pipe 1 by removing the unnecessary existing pipe 1 by the corrosion promoting means 3 for accelerating the corrosion of the pipe while leaving it in the soil. In the method of disposing of unnecessary existing pipes for early corrosion decomposition of the pipe 1, as the corrosion accelerating means 3, an external power source device 7 and a counter electrode 8 are connected and embedded in the vicinity of the unnecessary existing pipe 1 from the counter electrode 8. In addition, an anticorrosion method is used in which an anticorrosion current is applied to the object 9 to be protected to prevent the object 9 to be protected, and the unnecessary existing pipe 1 is used as the counter electrode 8 to promote corrosion.
[0008]
[0009]
[0010]
[0011]
In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry.
[0012]
[Action and effect]
According to the invention of claim 1 or 2 , since the unnecessary existing pipe in the soil is left in the soil without being removed, the unnecessary existing pipe is rapidly decomposed and decomposed by the corrosion promoting means for promoting the corrosion of the pipe. Excavation work for removing the unnecessary existing pipe becomes unnecessary.
That is, the corrosion promoting means accelerates the corrosion of the unnecessary existing pipes, and the unnecessary existing pipes are decomposed and destroyed, so that the unnecessary existing pipes can be disposed of without being excavated and left in the soil. Therefore, excavation work for removing unnecessary existing pipes in the soil becomes unnecessary.
As a result, the excavation work for removing the unnecessary existing pipe is not necessary, and the excavation cost spent for the excavation work for removing the unnecessary existing pipe from the soil can be reduced.
[0013]
The macrocell according to the invention of claim 1, in which the pre-Symbol corrosion promoting means, base metals by cell action constituted between both metal when electrically connected different metals potentials in soil is corroded Since corrosion is employed to promote corrosion of the unnecessary existing pipe, excavation work for removing the unnecessary existing pipe becomes unnecessary.
In other words, for example, when the unnecessary existing pipe and a metal having different potentials such as a manhole or a sewage structure such as a sewage are electrically connected, a macro cell (large-scale corrosion battery) that is a natural battery is formed between the two metals. The unnecessary existing pipe side, which is formed and made of base metal, which has a higher ionization tendency than the reinforcing bars in concrete structures such as manholes and buildings, becomes the anode (the electrode on which current flows) to promote corrosion decomposition. Macro-cell corrosion that causes the tube to be lost proceeds. This macro cell corrosion continuously proceeds from the outer surface, and the entire tube is corroded in a relatively short time.
As a result, the excavation work for removing the unnecessary existing pipe is not necessary, and the excavation cost spent for the excavation work for removing the unnecessary existing pipe from the soil can be reduced.
[0014]
Further, according to the invention of claim 2, as a pre-Symbol corrosion promoting means, as well as connecting the external power supply and a counter electrode, a protection current to said object anticorrosion object embedded in the vicinity of the undesired existing pipe from the counter electrode Since the corrosion prevention is promoted by using the anti-corrosion method for preventing the object to be protected from flowing by using the unnecessary existing pipe as the counter electrode, excavation work for removing the unnecessary existing pipe becomes unnecessary.
In other words, for example, the counter electrode is used as the unnecessary existing pipe and the object to be protected is used as a new pipe, and a corrosion protection current is forcibly passed from the unnecessary existing pipe through the soil to the new pipe. At the site where current is discharged into the soil of the unnecessary existing pipe, the anodic reaction is promoted to cause significant corrosion. By utilizing this anode reaction, the unnecessary existing pipe is destroyed by corrosion decomposition.
As a result, the excavation work for removing the unnecessary existing pipe is not necessary, and the excavation cost spent for the excavation work for removing the unnecessary existing pipe from the soil can be reduced.
[0015]
[0016]
[0017]
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
In the present invention, the unnecessary existing pipe 1 is disposed of at an early stage by the corrosion promoting means 3 for accelerating the corrosion of the pipe while leaving the unnecessary existing pipe 1 in the soil without being removed. It will be destroyed by corrosive decomposition.
[0019]
[First Embodiment]
In the first embodiment of the method of disposing the existing existing pipe 1 without removing it while remaining in the soil, the corrosion promoting means 3 for accelerating the corrosion of the unnecessary existing pipe 1 is used to electrically connect metals having different potentials in the soil. Macrocell corrosion (an example of the corrosion promoting means 3) is employed in which the base metal is corroded by the battery action formed between the two metals when they are connected together.
As shown in FIG. 1, the macro cell corrosion is not required to be buried in the deep layer after the new pipe 2 is buried in the shallow layer and the connection is changed at the present when the shallow layer can be buried by deregulation. When the unnecessary existing pipe 1 is electrically connected to the reinforcing bar in the concrete structure 4 such as a building through the conductive wire 5, a macro cell (large-scale corrosion battery) which is a natural battery is formed (corrosion promoting means 3). Example).
By this macro cell, the reinforcing bar side in the concrete structure 4 becomes a cathode (electrode through which current flows), and the unnecessary existing pipe 1 side made of metal having a lower potential than the reinforcing bar in the concrete structure 4 becomes the anode (current flows out). Corrosion current 6 flows from the unnecessary existing pipe 1 that is the anode to the rebar in the concrete structure 4 that is the cathode through the soil.
At this time, since severe macrocell corrosion occurs in the anode, corrosion progresses from the outer surface 1a of the unnecessary existing pipe 1, and the entire pipe is corroded and decomposed in a relatively short time, so that the unnecessary existing pipe 1 is lost. It can be disposed of without being removed and left in the soil, and a conventional excavation work for digging up and removing the unnecessary existing pipe 1 becomes unnecessary.
[0020]
[Second Embodiment]
In the second embodiment of the method of disposing of the unnecessary existing pipe 1 without removing it while remaining in the soil, the external power supply device 7 and the counter electrode 8 are connected as the corrosion promoting means 3 for promoting the corrosion of the unnecessary existing pipe 1. In addition, an anti-corrosion method (an example of the corrosion accelerating means 3) in which an anti-corrosion current is passed from the counter electrode 8 to the object 9 to be protected to prevent the object 9 to be protected is used, and the unnecessary existing pipe 1 is connected to the counter electrode. 8 promotes corrosion.
As shown in FIG. 2, with respect to the unnecessary existing pipe 1 buried in the deep layer, a new pipe 2 is horizontally buried in the vicinity thereof, and the unnecessary existing pipe 1 is used as a counter electrode 8 with an external power supply device 7 and a conductor 10. The new pipe 2 is anticorrosive by flowing an anticorrosion current from the unnecessary existing pipe 1 through the soil to the new pipe 2 that is the object 9 to be protected. Since the anode reaction is promoted at the site where the anticorrosion current 11 is released into the soil of the unnecessary existing pipe 1 having a high potential, and significant corrosion occurs, the corrosion proceeds from the outer surface 1a of the unnecessary existing pipe 1. Since the unnecessary existing pipe 1 can be destroyed by corrosion decomposition using this anode reaction, the excavation work for digging up the unnecessary existing pipe 1 and removing it from the soil as in the prior art becomes unnecessary. .
[0021]
[0022]
[0023]
[0024]
[Another embodiment]
Other embodiments will be described below.
<1> the inside of the unnecessary existing pipe, if example embodiment, and the resin is decomposed by soil bacteria, may be configured to fill brittle collapse easily such as concrete. That is, the when the interior of the unwanted existing pipe to loss is because corrosion was formed a space through which fluid, originally the substantially said undesired existing pipe as much unnecessary existing pipe is in soil exists portion of the space size is formed that can cause soil collapse, but if it above configuration, the or resin in the interior of the unnecessary existing pipe as required existing pipe has loss is corrosion, concrete, etc. By filling the space, it is possible to prevent the space from being formed in the soil by the resin, concrete, etc. filled in the internal space of the unnecessary existing pipe, and thus preventing the soil from collapsing. Can do.
< 2 > It should be noted that the material to be injected and filled into the unnecessary existing pipe is harmless to the soil and returned to the soil, for example, a resin that decomposes by soil bacteria or a concrete that is brittle and easily collapses. preferable. In this case, unnecessary existing pipes can be disposed of without adversely affecting the soil environment.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing a first embodiment according to the present invention. FIG. 2 is a conceptual diagram showing a second embodiment according to the present invention .
1 unnecessary existing pipe 3 corrosion promoting means 7 external power supply 8 counter 9 the anticorrosion object

Claims (2)

While leaving the soil without removing the unnecessary existing pipe in the soil, said at unnecessary existing pipe early disposal of unwanted existing pipe to corrode degrade due to corrosion promoting means for promoting corrosion of the tube, the accelerated corrosion As a means, by adopting macrocell corrosion in which base metal is corroded by the battery action formed between the two metals when they are electrically connected in the soil, the corrosion of the unnecessary existing pipe is promoted. How to dispose of unnecessary existing pipes. Accelerate corrosion by disposing of unnecessary existing pipes at an early stage by corrosion-promoting means that accelerates corrosion of the pipes while leaving them in the soil without removing them. As a means, an external anti-corrosion method is used in which an external power supply device and a counter electrode are connected and an anti-corrosion current is passed from the counter electrode to an object to be protected embedded in the vicinity of the unnecessary existing pipe to prevent the object to be corroded. and, disposal of unnecessary existing pipe that promotes the corrosion of the unnecessary existing pipe as the counter electrode.

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