JP4538958B2 - Anti-corrosion treatment equipment for through-wall steel pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anticorrosion structure for a wall-penetrating steel pipe part, and more specifically, for example, when a gas pipe or a water pipe is laid through a housing of a building (hereinafter simply referred to as a “wall”). The present invention relates to an anticorrosion treatment apparatus for a wall-penetrating steel pipe part that is preferably used when corrosion occurs in the steel pipe part located in the wall-penetrating part.
[0002]
[Prior art]
For example, a gas pipe or a water pipe laid using a steel pipe may be installed through a building frame. In a steel pipe laid through such a building's housing, if significant corrosion occurs on the outer peripheral surface of the steel pipe part that passes through the wall through hole, even if the inner peripheral surface of the through hole is partially broken and expanded, Since sufficient space with the outer peripheral surface of the steel pipe portion cannot be secured, and therefore it is difficult to repair the coating with a tape or sheet, the conventional anticorrosion treatment of the wall-penetrating steel pipe portion by the following method Was given.
[0003]
That is, as a conventional anticorrosion treatment method for the steel pipe portion passing through the wall through hole, the inner peripheral surface of the through hole around the wall through steel pipe portion is partially broken and expanded, and the wall through steel pipe portion is cut before and after the through hole, A method of pulling out from the through hole, removing it, and replacing it with a new pipe (coating pipe) is known. As another conventional anticorrosion treatment method for a steel pipe portion passing through a wall through hole, a method of filling a coating material around the wall through steel pipe portion is known.
[0004]
The latter anticorrosion treatment method will be described more specifically. As shown in FIG. 5, the inner peripheral surface of the through hole through which the steel pipe 1 passes is partially broken and enlarged, and the existing filler 3 filled at the time of laying is removed. Then, the outer pipe 4 having a length and a diameter to be fitted into the enlarged through hole 2 is press-fitted to make the wall through steel pipe part a double pipe.
[0005]
Thereafter, a rubber annular seal portion 5 is inserted into the gap between the inner peripheral surface of the outer tube 4 (end portion on the insertion side) and the outer peripheral surface of the steel pipe portion, and the gap is closed. Then, the tube 6 is inserted into the gap via the annular seal portion 5, and the coating material 7 is filled into the gap from this tube.
[0006]
[Problems to be solved by the invention]
However, such conventional anticorrosion treatment methods have the following problems.
That is, in the anticorrosion treatment method for replacing the wall penetration steel pipe part with a new steel pipe, the replacement work of the wall penetration steel pipe part is very troublesome and takes time and labor, and the construction cost becomes high, and the transport fluid flowing through the steel pipe There was a problem of having to stop (gas and water).
[0007]
Further, in the method in which the outer pipe 4 having a short length is press-fitted into the enlarged through hole and the coating material 7 is filled in the gap between the double pipes, air remains when the coating material 7 is filled in the gap ( Air pocket), and therefore, there is a problem that corrosion proceeds due to oxygen in the remaining air. In addition, when the coating material 7 is filled in the gap between the double pipes, the annular rubber seal portion 5 that closes the entrance side of the gap due to the filling pressure cannot withstand the filling pressure and escapes from the gap. Therefore, there is a problem that the coating material cannot be filled well.
[0008]
An object of the present invention is to solve such a conventional problem, and to prevent corrosion of a corroded portion in a wall-penetrating steel pipe portion very easily and satisfactorily without stopping the flow of transport fluid. An object of the present invention is to provide an anticorrosion treatment apparatus for a wall-penetrating steel pipe part.
[0009]
[Means for Solving the Problems]
The present invention is an anticorrosion treatment apparatus for a wall-penetrating steel pipe portion, and is configured as follows in order to solve the technical problems described above. That is, the present invention is an anticorrosion treatment apparatus for a steel pipe portion located in a wall through-hole, and is a tubular type inserted and arranged in the wall penetration portion so as to surround the steel pipe portion with a space from the outer peripheral surface of the steel pipe portion. The space between the mold frame and the inner circumferential surface of the mold frame and the outer circumferential surface of the steel pipe portion was set to be spaced from the anticorrosion treatment space section defined in the longitudinal central axis direction. One end is positioned in the space between the annular first seal portion and the second seal portion, and the end portion of the mold located on the back side of the second seal portion and the wall through hole, and the other end side is the wall through hole. A first coating material injection pipe drawn out of the outside, and a second coating material injection pipe with one end positioned in the anticorrosion treatment space and the other end drawn out of the wall through-hole, End portion of the formwork that is located on the back side of the wall through-hole from the second seal portion to the first coating material in the first coating material injection pipe Filling the space with, characterized by filling the second Nurikutsugae Paneling to anticorrosion treatment space in a subsequent second Nurikutsugae Paneling injection tube.
[0010]
<Additional configuration in the present invention>
The anti-corrosion treatment apparatus for a through-wall steel pipe portion of the present invention is composed of the above-described essential constituent elements, but can also be established by adding the following constituent elements to the constituent elements. The additional component is to further provide the mold with an air vent pipe communicating with the anticorrosion treatment space.
[0011]
Moreover, in the anti-corrosion treatment apparatus for a wall-penetrating steel pipe portion according to the present invention, it is an inner peripheral surface on the end side of the mold located on the back side of the wall through-hole, and faces the outlet of the first coating material injection pipe. It is also preferable to provide a spacer for diffusing the first coating material at a position where the coating is performed.
[0012]
Furthermore, in the anti-corrosion treatment apparatus for a through-wall steel pipe part of the present invention, the first coating material is an inflatable filler, and the second coating material is an anti-corrosion material. Examples of the expandable filler suitable as the first coating material include a foamed resin material. Furthermore, in the anti-corrosion treatment apparatus for a wall through steel pipe part according to the present invention, at least two tubular molds inserted and arranged in the wall through hole to surround the steel pipe part with a space from the outer peripheral surface of the steel pipe part are provided. It is preferable to configure with two half members.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the embodiment of the anticorrosion treatment apparatus for a through-wall steel pipe part of the present invention shown in the drawings will be described in more detail. 1 to 4 show an anticorrosion treatment apparatus 10 for a through-wall steel pipe part according to an embodiment of the present invention. This anti-corrosion treatment apparatus 10 for a wall-penetrating steel pipe part is spaced apart from the outer peripheral surface of the steel pipe part 13 passing through a through-hole (penetrating part) 12 formed in a housing (wall) 11 formed of, for example, reinforced concrete. A tubular form 14 made of, for example, vinyl chloride resin is inserted and disposed in the wall through hole 12 so as to surround the steel pipe portion 13.
[0014]
Since this formwork 14 is tubular, it cannot be covered in the middle of the laid steel pipe if it remains in this state. Therefore, at least two divided members 14a and 14b are manufactured, and these are formed into a steel pipe. It is preferable that the tube is assembled in a tubular shape so as to be covered, and the joining portion 14c along the central axis in the longitudinal direction is connected or sealed by an appropriate means. Of course, in the present invention, the number of split mold members constituting the mold 14 may be three or more.
[0015]
Between the inner peripheral surface of the front end portion 14a on the insertion side of the mold 14 and the outer peripheral surface of the steel pipe portion 13, an annular first seal portion 15 made of, for example, rubber or plastic is disposed, and the front end portion Between the inner peripheral surface of the mold 14 and the outer peripheral surface of the steel pipe part 13 at a position closer to the front end part 14a than the rear end part 14b located on the back side of the wall through hole 12 which is the opposite side to 14a, Similarly, an annular second seal portion 16 made of, for example, rubber or plastic is disposed.
[0016]
Due to the first seal portion 15 and the second seal portion 16, a part of the annular space portion formed between the inner peripheral surface of the mold 14 and the outer peripheral surface of the steel pipe portion 13 is longitudinal (axial direction). ) Are formed as the anticorrosion treatment space 17. In other words, the interval between the first seal portion 15 and the second seal portion 16 is designed so that the portion where the corrosion is generated on the surface of the steel pipe portion 13 is located in the anticorrosion treatment space portion 17 and the formwork is formed. 14 is positioned in place in the wall through hole 12.
[0017]
Within the mold 14, four first coating material injection pipes 18 (see FIG. 3) pass through the first seal portion 15 and the second seal portion 16 from the outside of the wall through hole 12 and are substantially equal in the circumferential direction. Arranged at intervals. Accordingly, the outlet end of the first coating material injection pipe 18 is located in the space from the second seal portion 16 to the rear end portion 14b side of the mold 14. The inlet of the first coating material injection pipe 18 is connected to a coating material injection device (not shown).
[0018]
On the other hand, the outlet end of the second coating material injection pipe 19 extending from the outside of the wall penetration portion is positioned in the anticorrosion treatment space portion 17 partitioned by the first seal portion 15 and the second seal portion 16. . The installation method of the 2nd coating material injection | pouring pipe | tube 19 is not specifically limited, For example, it installs so that it may pass through the 1st seal | sticker part 15 from the front-end part 14a side of the formwork 14, and may be connected to the anticorrosion process space part 17. Alternatively, as shown in FIGS. 1 to 3, it may be installed so as to penetrate from the outside of the mold 14 through the frame surface defining the anticorrosion treatment space 17 and communicate with the anticorrosion treatment space 17. Good.
[0019]
However, the outlet end of the second coating material injection pipe 19 is preferably located on the lower side in the gravity direction in the anticorrosion treatment space portion 17. That is, even if the anticorrosion treatment space portion 17 having an annular cross section extends in the horizontal direction as in the embodiment shown in FIGS. 1 to 3, or extends in the vertical direction. The outlet end of the second coating material injection pipe 19 may be positioned in the lower space.
[0020]
In addition, two air vent pipes 20a and 20b are arranged outside the formwork 14 and their respective tip portions, that is, air inlets, penetrate through the frame surface defining the anticorrosion treatment space 17 in the formwork 14. Then, it communicates with the anticorrosion treatment space 17. In that case, it is preferable that the air introduction port of each of these air vent pipes 20a and 20b is located on the upper side in the gravity direction in the anticorrosion treatment space portion 17.
[0021]
In this way, the outlet end of the second coating material injection pipe 19 is positioned on the lower side in the gravity direction in the anticorrosion treatment space 17, and the air inlets of the air vent pipes 20 a and 20 b are located in the anticorrosion treatment space 17. The reason why it is preferable that the coating material is positioned on the upper side in the gravity direction is that the coating material is filled from the lower side in the gravity direction to the upper side in the anticorrosion processing space portion 17 when the coating material is injected into the anticorrosion processing space portion 17. This is because the air in the anticorrosion treatment space 17 is pushed out and exhausted accordingly.
[0022]
Thereby, the occurrence of air pockets such as air pockets in the anticorrosion treatment space 17 can be prevented, which leads to the achievement of complete anticorrosion treatment. Moreover, the air vent pipes 20a and 20b can also be used as a confirmation pipe for judging the full state when the coating material is injected into the anticorrosion treatment space portion 17.
[0023]
That is, after the coating material is completely filled in the anticorrosion treatment space portion 17, there is no place to go and the air vent pipes 20a and 20b are entered. Accordingly, when it is confirmed that the coating material has entered the air vent pipes 20a and 20b after the coating material is started to be injected into the anticorrosion processing space portion 17, the anticorrosion processing space portion 17 is a coating material. It can be judged that it was full.
[0024]
By the way, on the inner peripheral surface of the rear end portion 14b of the mold 14, a position facing the outlet end of the first coating material injection pipe 18, that is, an extension line along the longitudinal center axis of the mold 14 from the outlet end. Further, a diffusion spacer 21 is provided so as to contact the outer peripheral surface of the steel pipe portion 13.
[0025]
That is, as shown in FIG. 3, in the case of this embodiment, four fragmentary spacers 21 are opposed to the outlet end of the first coating material injection pipe 18 on the inner peripheral surface of the rear end portion of the mold 14. Respectively. The spacer 21 is preferably made of rubber, but is not limited to the material in the present invention, and may be a spacer made of synthetic resin or other material.
[0026]
Next, the usage method of the corrosion prevention processing apparatus 10 of the wall penetration steel pipe part which concerns on this embodiment is demonstrated. First, the wall through-hole 12 is enlarged to a size that allows the above-described formwork 14 to be inserted and disposed in the wall-through steel pipe portion 13, and then the peripheral surface of the wall-through steel pipe portion 13 is cleaned. Next, a mold in which the annular first seal part 15, the second seal part 16, the diffusion spacer 21, the coating material injection pipes 18, 19 and the air vent pipes 20a, 20b are attached at predetermined positions on the inner peripheral surface. The frame 14 is sheathed on the steel pipe and inserted into the wall through hole 12.
[0027]
The first coating material injection tube 18 is used to form a first coating material such as a foamed resin material 22 in the space from the second seal portion 16 to the rear end portion 14b of the mold 14. An inflatable filler is injected. The foamed resin material 22 is used to prevent the second coating material from leaking from the second seal portion 16 when the anticorrosion processing space portion 17 is filled with the second coating material that is an anticorrosion processing material. Is.
[0028]
Specifically, the foamed resin material 22 injected from the outlet end of the first coating material injection pipe 18 is diffused by colliding with a diffusion spacer 21 provided at a position opposite to the outlet end. Are filled around the steel pipe part on the rear end part 14b side of the mold 14 and seal the gap between the second seal part 16 and the outer peripheral surface of the steel pipe part.
[0029]
Thereafter, the anticorrosion treatment material 23, which is the second coating material, is filled in the anticorrosion treatment space 17 by the second coating material injection pipe 19, and the anticorrosion treatment space 17 is filled with the anticorrosion treatment material 23. The air is discharged from the air vent pipes 20a and 20b to the atmosphere, so that the anticorrosion treatment material 23 can be filled without the presence of air pockets or the like in the anticorrosion treatment space 17, and the subsequent progress of corrosion is prevented. be able to.
[0030]
Note that whether or not the anticorrosion treatment material 23 is sufficiently filled in the anticorrosion treatment space 17 depends on whether the anticorrosion treatment material 23 overflows from the air vent pipes 20a and 20b as described above. It can be confirmed immediately by configuring the tubes 20a and 20b with tubes made of a transparent material. Then, when it is confirmed that the anticorrosion treatment material 23 is sufficiently filled in the anticorrosion treatment space 17, the first coating material injection pipe 18, the second coating material injection pipe 19, and the air vent pipe 20a, By cutting 20b along the surface of the wall, this anticorrosion treatment work is completed.
[0031]
【The invention's effect】
As described above, according to the anticorrosion treatment apparatus for a wall-penetrating steel pipe portion according to the present invention, the anticorrosion treatment for a corroded portion in the wall-penetrating steel pipe portion can be performed very easily and well without stopping the flow of the transport fluid. Can do.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically showing a state in which an anticorrosion treatment apparatus for a wall through steel pipe part according to an embodiment of the present invention is installed in a wall through steel pipe part to perform an anticorrosion treatment.
FIG. 2 is a cross-sectional view schematically showing an anticorrosion treatment apparatus for a wall through steel pipe portion according to an embodiment of the present invention.
FIG. 3 is a side view of the anticorrosion treatment apparatus for a wall through steel pipe portion shown in FIG. 2 as viewed from the right side along line 3-3.
4 is a cross-sectional view taken along line 4-4 of the anticorrosion treatment apparatus for a wall through steel pipe portion shown in FIG.
FIG. 5 is a schematic cross-sectional view showing an example of a conventional anticorrosion treatment method for a wall-penetrating steel pipe portion.
[Explanation of symbols]
10 Anti-corrosion treatment equipment for wall-penetrating steel pipe part 11 Wall (frame)
12 Wall through-hole 13 Wall through-steel pipe part 14 Tubular formwork 14a Mold form front end part 14b Mold form rear end part 14c Half-split formwork mating part 15 First seal part 16 Second seal part 17 Anticorrosion treatment space Part 18 First coating material injection tube 19 Second coating material injection tube 20a, 20b Air vent tube 21 Diffusion spacer

Claims (5)

An anticorrosion treatment apparatus for a steel pipe portion located in a wall through-hole, and a tubular formwork inserted and arranged in the wall penetration portion so as to surround the steel pipe portion with a space from the outer peripheral surface of the steel pipe portion, A ring-shaped first annular space provided between the inner peripheral surface of the mold and the outer peripheral surface of the steel pipe portion is spaced apart from the anticorrosion treatment space section defined in the longitudinal central axis direction. One end is positioned in the space between the first seal portion and the second seal portion, and the second seal portion and the end portion of the mold located on the back side of the wall through hole, and the other end side passes through the wall. A first coating material injection pipe drawn out of the hole, a second coating material injection pipe with one end positioned in the anticorrosion treatment space and the other end drawn out of the wall through-hole, Consists of
The first coating material is filled into the space from the second seal portion to the end of the mold located on the back side of the wall through hole with the first coating material injection tube, and then the first coating material is filled. An anticorrosion treatment apparatus for a through-wall steel pipe portion, wherein the anticorrosion treatment space portion is filled with a second coating material with two coating material injection pipes. The anti-corrosion treatment apparatus for a through-wall steel pipe part according to claim 1, wherein the mold is further provided with an air vent pipe communicating with the anti-corrosion treatment space. It is an inner peripheral surface on the end side of the mold located on the back side of the wall through hole, and is used for diffusing the first coating material at a position facing the outlet of the first coating material injection pipe. The anti-corrosion treatment apparatus for a through-wall steel pipe part according to claim 1 or 2, wherein a spacer is provided. 4. The through-wall steel pipe part according to claim 1, wherein the first coating material is an inflatable filler, and the second coating material is an anticorrosion treatment material. 5. Anticorrosion treatment equipment. The tubular formwork inserted and arranged in the wall through hole so as to surround the steel pipe part with a space from the outer peripheral surface of the wall through steel pipe part is constituted by at least two halved members. The anticorrosion treatment apparatus for a wall through steel pipe part according to any one of claims 1 to 4.

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