JP5812673B2 - Steel pipe internal rust prevention member - Google Patents

Description

  The present invention relates to a steel pipe internal rust preventive member suitable for preventing corrosion inside a steel pipe of an apparatus or equipment used in a thermal power plant or the like.

  In the manufacturing process, transportation, and storage of the steel pipe, if the inside of the steel pipe comes into contact with the outside air, the inside of the steel pipe is likely to rust due to the humidity of the outside air. Conventionally, in order to prevent the occurrence of rust inside the steel pipe, a vaporizable rust inhibitor is sealed inside the steel pipe, caps are attached to both ends of the steel pipe, and sealed with tape to suppress the ingress of outside air. There has been proposed a rust prevention method for preventing the occurrence of rust inside (see, for example, Patent Documents 1 and 2).

  In order to more effectively suppress the occurrence of rust inside the steel pipe and prevent corrosion inside the steel pipe, for example, in Patent Document 1, the lid of the opening of a metal object enclosing a vaporizable rust preventive agent is used. Using a porous material that is water-repellent with a moisture-permeable material, it ensures moderate air permeability and effectively suppresses dew condensation inside the steel pipe due to temperature changes. Moreover, in patent document 2, ammonium carbonate is further enclosed in the inside of a steel pipe, and lifetime improvement of the vaporizable rust preventive material enclosed in the inside of a steel pipe is aimed at.

Japanese Patent Publication No. 1-20232 Japanese Patent Publication No.5-1676

  However, when the normal storage period of the steel pipe is 1 month to 6 months or more, it is possible to sufficiently prevent rainwater from entering the pipe and causing condensation during the period due to the temperature difference of the outside air. Therefore, there is a problem that the life of the vaporizable rust inhibitor is shortened, and as a result, rusting inside the steel pipe cannot be effectively prevented.

  In other words, when the surface temperature of the steel pipe decreases, the temperature inside the steel pipe decreases and the pressure decreases, and rainwater infiltrates from the seal part where the caps attached to both ends of the steel pipe are sealed with tape or the like. Rainwater infiltrates. In addition, when the rain rises and the surface temperature of the steel pipe rises and the temperature inside the steel pipe rises, only the air inside the steel pipe is discharged, and the rainwater that enters the steel pipe stays in the steel pipe and remains corroded (rust). Occur. Moreover, since the vaporizable rust preventive has little effect on rainwater or the like that has entered the steel pipe, the occurrence of corrosion (rust) cannot be effectively suppressed. In addition, when the cap attached to both ends of the steel pipe is an inner lid type attached to the inside of the steel pipe, if the steel pipe is stored under hot weather, etc., the pressure inside the steel pipe rises as the gas temperature inside the steel pipe rises. May come off from the steel pipe.

  This invention is made | formed in view of such an actual condition, Comprising: It aims at providing the corrosion prevention member inside a steel pipe which suppressed the corrosion inside a steel pipe more effectively, and improved safety.

1st invention of this invention for solving the subject mentioned above is a steel pipe internal rust prevention member provided with the cover member provided in the opening part of the both ends of a steel pipe, Comprising: The said cover member is an edge part of the said steel pipe. A joint cylinder disposed on the outer peripheral surface of the steel pipe so as to be positioned at one end side, a lid part provided to close the other end side of the joint cylinder, and having a vent hole, and the lid part And a cylindrical portion having a bent portion that extends from the opening edge portion of the vent hole to the inside of the steel tube, and is bent at least partially continuously to meander. It is.

2nd invention is a steel pipe internal rust prevention member provided with the cover member provided in the opening part of the both ends of a steel pipe in 1st invention, Comprising: The said cover member has one end side located in the edge part of the said steel pipe As described above, a joining cylinder disposed on the outer peripheral surface of the steel pipe, a lid portion provided to close the other end side of the joining cylinder, and having a vent hole, and the vent hole in the lid portion It has a cylindrical part extended from the opening edge to the outside of the steel pipe, and a collar part provided at the end of the joining cylinder and extending from the joining cylinder toward the outside of the steel pipe. It is a steel pipe internal rust prevention member characterized.

A third invention is the steel pipe internal rust prevention member according to the first or second invention, wherein a part of the joining cylinder is a bellows member.

A fourth invention is a steel pipe internal rust preventive member according to any one of the first to third inventions, wherein a part of the cylindrical portion is refracted into a hook shape.

5th invention is a steel pipe internal rust prevention member which has a cover member provided in the opening part of the both ends of a steel pipe, Comprising: The said cover member is an outer side of the said steel pipe so that one end side may be located in the edge part of the said steel pipe And a first lid portion that is provided so as to close the other end side of the joining cylinder and has a ventilation hole, and a first inside the joining cylinder. A second lid portion provided between the lid portion and the steel pipe and having a vent hole , wherein the first lid portion and the second lid portion are provided on the first lid portion and the second lid portion, respectively. the cylindrical portion provided to extend to the outside of the steel pipe to the opening edge portion of the vent was closed, respectively, the cylindrical portion of the first lid and the second lid, in the cylinder axis direction position of the vent hole of the first cover and the second cover part is characterized that you have placed respectively so as not to overlap each other It is inside the tube anti-corrosion member.

6th invention is a steel pipe internal rust prevention member which has a lid member provided in the opening of both ends of a steel pipe, and the lid member of the steel pipe is located so that the other end side may be located in the end of the steel pipe. A joining cylinder disposed on an inner side peripheral surface ; a first lid provided inside the steel pipe and at one end of the joining cylinder and having a vent; and an outside of the steel pipe and the joining cylinder. A second lid portion that is formed larger than the outer periphery of the steel pipe and has a vent hole, and the first lid portion and the second lid portion include the first lid portion and the second lid portion, respectively. cylindrical portion provided to extend to the outside of the steel pipe to the opening edge portion of the vent hole of the second lid was closed, respectively, the cylindrical portion of the first lid and the second lid In addition, the positions of the vent holes of the first lid portion and the second lid portion in the cylinder axis direction are set so as not to overlap each other. Which do a steel internal anticorrosive member, wherein Rukoto.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects of the present invention, the vaporization preventive is installed inside the steel pipe and generates a vaporized gas to keep the vaporized gas inside the steel pipe at an effective concentration. It is a steel pipe internal rust prevention member characterized by having a rusting agent.

  According to the present invention, corrosion inside the steel pipe can be further effectively suppressed and safety can be improved.

FIG. 1 is a schematic diagram showing the configuration of a steel pipe internal rust preventive member according to Example 1 of the present invention. FIG. 2 is a view showing the inflow and outflow of vaporized gas into and out of the steel pipe. FIG. 3 is a diagram showing adsorption of vaporized gas on the rust preventive. FIG. 4 is a diagram illustrating another configuration of the lid member. FIG. 5 is a diagram showing another configuration of the lid member. FIG. 6 is a diagram illustrating another configuration of the lid member. FIG. 7 is a diagram illustrating another configuration of the lid member. FIG. 8 is a diagram illustrating another configuration of the lid member. FIG. 9 is a diagram illustrating another configuration of the lid member. FIG. 10 is a view showing a state in which a vaporizable rust inhibitor is provided outside the steel pipe. FIG. 11: is schematic which shows the structure of the steel pipe internal rust prevention member based on Example 2 by this invention. FIG. 12 is a schematic diagram showing the configuration of a steel pipe internal rust preventive member according to Example 3 of the present invention. FIG. 13 is a schematic diagram showing the configuration of a steel pipe internal rust preventive member according to Example 4 of the present invention. FIG. 14 is a diagram illustrating another configuration of the lid member.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the content described in the following Examples. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

  A steel pipe internal rust preventive member according to Example 1 of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a steel pipe internal rust preventive member according to the present embodiment, FIG. 2 is a diagram showing the entry and exit of vaporized gas into and out of the steel pipe, and FIG. It is a figure which shows adsorption | suction of vaporization gas. As shown in FIG. 1, the steel pipe internal rust prevention member 10 </ b> A according to the present embodiment has a pair of lid members 13 </ b> A provided at the opening portions 12 at both ends of the steel pipe 11.

  The steel pipe 11 is a steel pipe such as a device or equipment used in plant equipment such as a thermal power plant.

  The lid member 13A includes a joining cylinder 15 provided on the outer peripheral surface of the end of the steel pipe 11, and a lid 16 provided to close at least the joining cylinder 15 and to be provided at a predetermined interval from the end of the steel pipe 11. Have. The lid member 13A is provided with a vent hole 17 in the lid portion 16. The joining cylinder 15 is sealed and fixed using a sealing member 18 such as a steel pipe 11 and a tape. The cross-sectional shape of the vent hole 17 can be an arbitrary shape such as a circle or a square.

  The air 19 inside the steel pipe 11 repeatedly contracts and expands as the temperature changes. However, since the air hole 17 is provided in the lid portion 16, the air 19 inside the steel pipe 11 is vented as shown in FIG. 17 enters and exits the outside of the steel pipe 11. Thereby, since the inside of the steel pipe 11 is not in a pressurized state or a reduced pressure state, it is possible to suppress the occurrence of a differential pressure between the outside and the inside of the steel pipe 11. The steel pipe 11 and the lid member 13A are provided with a seal member 18 for suppressing rainwater from entering from the outside of the steel pipe 11. However, since the lid portion 16 is provided with a vent hole 17, the rain pipe or the like is used. However, since the inside of the steel pipe 11 is not decompressed, it is possible to prevent rainwater from being sucked into the gap between the seal members 18 and entering the inside of the steel pipe 11 through the gap between the seal members 18.

  Therefore, it is possible to suppress the occurrence of corrosion inside the steel pipe 11 and to prevent the lid member 13 </ b> A from coming off due to a pressure difference inside and outside the steel pipe 11.

  A vaporizable rust inhibitor 21 is provided inside the steel pipe 11. Examples of the vaporizable rust preventive agent 21 include amine-based and ammonium-based vaporizable rust preventive agents, and ammonium-based vaporizable rust preventive agents are preferably used. Examples of the vaporizable rust preventive include dicyclohexylammonium nitrate (DICHAN), cyclohexylammonium carbonate, diisopropylammonium nitrate (DIPAN), guanidine carbonate, mercaptobenzothiazole, cyclohexylammonium caprylate, diisopropylamine nitrite, dicyclohexylammonium laurate. Rate, cyclohexylammonium carbamate ammonium benzoate, dicyclohexylammonium nitrite (DICHAN), dicyclohexylammonium salicylate (DICHA • SA), dicyclohexylammonium benzoate (DICHA • BA), diisopropylammonium benzoate (DIPA • BA), diisopropylammoni Munitelite (DIPAN), nitronaphthaleneammonium nitrite (NITAN), dicyclohexylammonium caprylate, dicyclohexylammonium cyclohexanecarboxylate (DICHA · CHC), dicyclohexylammonium acrylate (DICHA · AA), cyclohexylammonium carbonate, dicyclohexylammonium caprylate, Examples include cyclohexyl ammonium laurate. Among these, it is particularly preferable to use at least one selected from the group consisting of dicyclohexylammonium nitrate (DICHAN), cyclohexylammonium carbonate, diisopropylammonium nitrate (DIPAN), guanidine carbonate, and mercaptobenzothiazole. These substances are preferable because they are vaporizable (sublimable), exhibit excellent corrosion prevention effects on SUS430 used as a material for the steel pipe 11 and the like, and have high safety. Moreover, since these substances are generally kneaded into an organic composition, they are preferably powders. Moreover, a vaporizable rust preventive may be used alone or in combination. In particular, dicyclohexylammonium nitrate (DICHAN) and diisopropylammonium nitrate (DIPAN) may be used in combination. Dicyclohexylammonium nitrate has an advantage that the vapor pressure at a constant temperature is smaller than that of diisopropylammonium nitrate (DIPAN) and has a long rust prevention effect. Diisopropylammonium nitrate has an excellent initial rust prevention effect. Therefore, when both are combined, a moderate antirust effect can be exhibited over a long period of time.

  By providing the vaporizable rust preventive agent 21 inside the steel pipe 11, a slight vaporization reaction can be continued for a long period of time. Since the vaporized gas 22 generated from the vaporizable rust preventive agent 21 is discharged out of the system through the vent hole 17, an increase in the vaporized gas concentration of the vaporizable rust preventive agent 21 inside the steel pipe 11 is suppressed. Thus, the effective concentration of the vaporized gas 22 inside can be maintained, and the safety of the steel pipe 11 can be improved.

  Further, when the inner wall of the steel pipe 11 is condensed, as shown in FIG. 3, condensed water 23 is generated inside the steel pipe 11, but the vaporized gas 22 generated from the vaporizable rust preventive agent 21 is condensed on the inner wall of the steel pipe 11. Since it is absorbed by the water 23, the pH of the dew condensation water 23 adhering to the inner wall of the steel pipe 11 rises, and it can suppress that rust generate | occur | produces in the steel pipe 11.

  Further, the dew condensation water 23 adhering to the inner wall of the steel pipe 11 evaporates and is discharged out of the system through the vent hole 17 as the ventilation and temperature rise.

  Therefore, the steel pipe internal rust prevention member 10A according to the present embodiment does not cause a differential pressure between the inside and the outside of the steel pipe 11 and the inside of the steel pipe 11 is not in a reduced pressure state. Can be suppressed, corrosion can be prevented from occurring inside the steel pipe 11, and the lid member 13 </ b> A can be prevented from coming off due to a pressure difference inside and outside the steel pipe 11. Can do. Moreover, since it can suppress and keep effective the density | concentration in the inside of the steel pipe 11 of the vaporization gas 22 produced from the vaporizable rust preventive agent 21, the safety | security in the steel pipe 11 can be ensured.

  Further, in this embodiment, the lid member 13A of the steel pipe internal rust prevention member 10A is constituted only by the joining cylinder 15 and the lid portion 16, but this embodiment is not limited to this, and the steel pipe 11 You may make it provide corresponding to the shape, length, etc. of this. Other configurations of the lid member 13A are shown in FIGS.

  As shown in FIG. 4, when the vent hole 17 is provided in the lid portion 16, the lid member 13 </ b> B is provided in the vent portion 17 of the lid portion 16 so as to extend outside the steel pipe 11. You may make it have. The cross-sectional shape of the cylindrical portion 24A can be appropriately changed according to the hole shape of the vent hole 17, and can be a circular shape, a square shape, or the like. By providing the cylindrical portion 24 </ b> A toward the outside of the steel pipe 11 in the vent hole 17 of the lid portion 16, it is possible to suppress the condensation water 23 from adhering to the vent hole 17 of the steel pipe 11, and the inside of the steel pipe 11. The air 19 can be prevented from entering.

  The lid member 13 </ b> B may be provided with a collar portion 25 at the end portion of the joining cylinder 15. When the tubular portion 24A is provided outside the steel pipe 11 from the vent hole 17 of the lid portion 16 by providing the flange portion 25 at the end portion of the joining tube 15, the tubular portion 24A is subjected to an impact when receiving an impact from the outside. It is possible to reduce the damage to the shape portion 24A.

  Note that the collar portion 25 is not necessarily provided at the end portion of the joining cylinder 15, and the collar portion 25 is not provided at the end portion of the joining cylinder 15 when the probability that the cylindrical portion 24 </ b> A is impacted from the outside is low. May be.

  In addition, the lid member 13B is provided with the cylindrical portion 24 outside the lid portion 16; however, the lid member 13B is not limited to this, and the lid member 13C passes through the lid portion 16 as shown in FIG. You may make it have the cylindrical part 24B provided in the air_hole | stoma 17 extended inside the steel pipe 11. FIG.

  Moreover, although cylindrical part 24A, 24B is formed in the cylindrical shape, a present Example is not limited to this, The member of another shape may be included. FIG. 6 is a diagram showing another configuration of the lid member 13A. Like the lid member 13D shown in FIG. 6, a cylindrical portion 24C having a bent portion 26 that is partially bent continuously may be provided. The bent portion 26 is formed to meander from the vent hole 17 toward the inside of the steel pipe 11. Thereby, the approach of the air 19 to the inside of the steel pipe 11 can be suppressed by providing the bent part 26 in at least a part of the cylindrical part 24C.

  Moreover, although the joining cylinder 15 is formed in the cylindrical shape so that it may be attached to the outer wall of the steel pipe 11, a present Example is not limited to this, The member of another shape may be included. FIG. 7 is a diagram showing another configuration of the lid member 13A. A bellows member 27 may be included in a part of the joining cylinder 15 like a lid member 13E shown in FIG. The joining cylinder 15 and the lid part 16 are connected via a bellows member 27. Since the bellows member 27 is formed in a bellows shape, even if the lid member 13E receives an impact from the outside, the impact can be buffered by the bellows member 27, so that the lid member 13E can be prevented from being damaged. .

  In the present embodiment, the bellows member 27 is provided at the end of the joining tube 15 and is connected to the lid portion 16. However, the present invention is not limited to this. The member 27 may be used.

  In the present embodiment, the shape of the bellows member 27 of the lid member 13E is formed in a bellows shape. However, the shape is not limited to this, and the lid member 13E such as a piston member or an elastic member receives an impact from the outside. Any cushioning member can be used as long as it can be cushioned.

  Moreover, although the cylindrical part 24A is formed in a cylindrical shape corresponding to the shape of the vent hole 17, the present embodiment is not limited to this, and may include members of other shapes. FIG. 8 is a diagram showing another configuration of the lid member 13A. As shown in the lid member 13F shown in FIG. 8, it may have a cylindrical portion 24D partially refracted into a hook shape. The cylindrical portion 24D is provided in the outer side direction of the steel pipe 11 from the vent hole 17 of the lid portion 16, and is formed so that the direction of the end portion 28 is the circumferential direction in which the joining cylinder 15 and the flange portion 25 are provided. You may do it. Thereby, the approach of the air 19 (refer FIG. 2) to the inside of the steel pipe 11 can be suppressed.

  Another configuration of the lid member 13F is shown in FIG. As shown in FIG. 9, the lid member 13G is provided on the outer side of the steel pipe 11 from the vent hole 17 of the lid portion 16, and the direction of the end portion 28 is the circumferential direction in which the joining tube 15 and the flange portion 25 are provided. You may make it have the cylindrical part 24D provided in the shape of a bellows. Thereby, the approach of the air 19 (refer FIG. 2) to the inside of the steel pipe 11 can be suppressed further efficiently.

  Further, in the steel pipe internal rust preventive member 10A according to the present embodiment, the vaporizable rust preventive agent 21 is provided inside the steel pipe 11, but the present embodiment is not limited to this, and FIG. As shown in FIG. 3, a vaporizable rust inhibitor 21 may be provided outside the steel pipe 11.

  Thus, according to the steel pipe internal rust preventive member 10A according to the present embodiment, the lid member 13A can be provided in the opening 12 at the end of the steel pipe 11 while corresponding to the shape and length of the steel pipe 11 and the like. The pressure difference between the inside and outside of the steel pipe 11 can be suppressed. For this reason, it is possible to suppress the intrusion of rainwater into the steel pipe 11, to suppress the occurrence of corrosion inside the steel pipe 11, and to prevent the lid member 13 </ b> A from being detached from the steel pipe 11. it can. Moreover, even if the vaporizable rust preventive agent 21 is provided in the steel pipe 11, the concentration of the vaporized gas 22 generated from the vaporizable rust preventive agent 21 in the steel pipe 11 can be kept effective, so that the safety in the steel pipe 11 is ensured. can do.

  In addition, in 10 A of steel pipe internal rust prevention members which concern on a present Example, although cover member 13A-13E is provided in the both ends of the steel pipe 11, a present Example is not limited to this, Only one side of the steel pipe 11 In such a case, only one steel pipe internal rust prevention member 10A may be provided on the lid members 13A to 13G.

  A steel pipe internal rust preventive member according to Example 2 of the present invention will be described with reference to the drawings. Since the structure of the steel pipe internal rust prevention member according to the present embodiment is the same as the structure of the steel pipe internal rust prevention member shown in FIG. 1 described above, the same reference numerals are assigned to the same members as the steel pipe internal rust prevention member. The description thereof is omitted.

  FIG. 11 is a schematic diagram showing the configuration of the steel pipe internal rust prevention member according to the present embodiment. As shown in FIG. 11, the steel pipe internal rust preventive member 10B according to the present embodiment includes a joining cylinder 15 provided on the outer peripheral surface of the steel pipe 11, and a lid portion 16-1 provided on the joining cylinder 15. And a lid member 31A provided with 16-2. The cover parts 16-1 and 16-2 are provided with cover parts 16-1 and 16-2 in order from the opening 12 side of the steel pipe 11 to the outside. Further, the lid member 31A is a cylindrical portion 24A-1 provided so as to extend toward the outside of the steel pipe 11 in the vent holes 17-1 and 17-2 of the lid portions 16-1 and 16-2. , 24A-2. A vent hole 32 is provided in a part of the joining cylinder 15.

  The air inside the steel pipe 11 passes through the vent holes 17-1, then passes through the vent holes 17-2 and 32, and is supplied to the outside of the steel pipe 11. Further, the air outside the steel pipe 11 passes through the vent holes 17-2 and 32, and then passes through the vent hole 17-1 and is supplied to the inside of the steel pipe 11.

  Therefore, according to the steel pipe internal rust preventive member 10B according to the present embodiment, lid portions 16-1 and 16-2 are provided in the joining cylinder 15, and the air holes through which the air 19 (see FIG. 2) passes are doubled. ing. Therefore, the intrusion of rainwater into the steel pipe 11 can be further efficiently suppressed, and the occurrence of corrosion inside the steel pipe 11 can be further efficiently suppressed.

  Further, in the steel pipe internal rust preventive member 10B according to the present embodiment, one vent hole 32 is provided in the joining cylinder 15, but the present embodiment is not limited to this, and the vent hole 32 is A plurality of joining cylinders 15 may be provided.

  Further, in the steel pipe internal rust prevention member 10B according to the present embodiment, the lid member 31A is provided with two lid portions on the joining cylinder 15, but the present embodiment is not limited to this, and the steel pipe You may make it provide 3 or more according to the magnitude | size, shape, etc. of 11.

  Further, in the steel pipe internal rust prevention member 10B according to the present embodiment, the lid member 31A is provided with the cylindrical portions 24A-1 and 24A-2 on the lid portions 16-1 and 16-2. The cylindrical portions 24A-1 and 24A-2 are not necessarily limited to the lid portions 16-1 and 16-2.

  Moreover, in the steel pipe internal rust prevention member 10B which concerns on a present Example, although cylindrical part 24A-1, 24A-2 is provided so that it may face the outer side of the steel pipe 11, a present Example is limited to this. Instead, the cylindrical portion 24 may be provided so as to face the inside of the steel pipe 11.

  A steel pipe internal rust preventive member according to Example 3 of the present invention will be described with reference to the drawings. Since the structure of the steel pipe internal rust prevention member according to the present embodiment is the same as the structure of the steel pipe internal rust prevention member shown in FIG. 1 described above, the same reference numerals are assigned to the same members as the steel pipe internal rust prevention member. The description thereof is omitted.

  FIG. 12 is a schematic diagram showing the configuration of the steel pipe internal rust prevention member according to the present embodiment. As shown in FIG. 12, the steel pipe internal rust preventive member 10 </ b> C according to the present embodiment includes a joining cylinder 15 provided on the inner peripheral surface of the steel pipe 11, and first joints provided at both ends of the joining cylinder 15. A lid member 31B having a lid portion 16-1 and a second lid portion 16-2 is provided. The first lid portion 16-1 is provided inside the steel pipe 11. The 2nd cover part 16-2 is provided outside the opening part 12 of the steel pipe 11, and the magnitude | size of the cross section in the direction orthogonal to the length direction of the steel pipe 11 is formed larger than the outer periphery of the steel pipe 11. . Further, the lid member 31B is a tube provided to extend to the outside of the steel pipe 11 in the vent holes 17-1 and 17-2 of the first lid portion 16-1 and the second lid portion 16-2. 24A-1 and 24A-2. In the steel pipe internal rust prevention member 10C according to the present embodiment, the steel pipe 11 is provided vertically and the opening 12 of the steel pipe 11 faces downward, so that the cylindrical parts 24A-1 and 24A-2 are the first lid part. 16-1 and the 2nd cover part 16-2 are provided in the downward direction. Moreover, the collar part 25 is provided in the edge part of the joining cylinder 15 connected with the 1st cover part 16-1. Further, the joining cylinder 15 and the steel pipe 11 are fixed by performing welding 33 or the like.

  The air inside the steel pipe 11 passes through the vent hole 17-1 and descends in the steel pipe 11, and then passes through the vent hole 17-2 and is supplied to the outside of the steel pipe 11. The air outside the steel pipe 11 rises after passing through the vent hole 17-2, passes through the vent hole 17-1, and is fed into the steel pipe 11.

  Therefore, according to the steel pipe internal rust prevention member 10C according to the present embodiment, the first lid portion 16-1 and the second lid portion 16-2 are provided in the joining cylinder 15, and the air 19 (see FIG. 2) passes through. The ventilation holes are configured in a double manner. Therefore, even if the steel pipe 11 is vertical and the flow direction of the air 19 (see FIG. 2) is vertical, the discharge port of the air 19 (see FIG. 2) is directed downward. The intrusion of rainwater into the inside can be further efficiently suppressed, and the occurrence of corrosion inside the steel pipe 11 can be further efficiently suppressed.

  Further, in the steel pipe internal rust prevention member 10C according to the present embodiment, the cylindrical portions 24A-1 and 24A-2 are provided with the first lid portion 16-1 and the second lid portion 16-2 facing downward. However, the present embodiment is not limited to this, and the cylindrical portions 24A-1 and 24A-2 may be provided so as to face the inside of the steel pipe 11.

  A steel pipe internal rust preventive member according to Example 4 of the present invention will be described with reference to the drawings. Since the structure of the steel pipe internal rust prevention member according to the present embodiment is the same as the structure of the steel pipe internal rust prevention member shown in FIG. 1 described above, the same reference numerals are assigned to the same members as the steel pipe internal rust prevention member. The description thereof is omitted.

  FIG. 13 is a schematic diagram showing the configuration of the steel pipe internal rust preventive member according to the present embodiment. As shown in FIG. 13, the steel pipe internal rust preventive member 10 </ b> D according to this embodiment includes a joining cylinder 15 provided on the inner peripheral surface of the steel pipe 11, a lid 16, and an end of the steel pipe 11 at the end of the joining cylinder 15. 42A having a cap portion 41 provided so as to close the portion. A vent hole 43 is provided in a part of the joining cylinder 15. The lid portion 16 is provided on a part of the side peripheral surface of the inner wall of the bonding cylinder 15. A cylindrical portion 24 </ b> A is provided in the vent hole 17 of the lid portion 16 in the direction of the umbrella portion 41. The cross-sectional shape of the vent hole 43 can be an arbitrary shape such as a circle or a square.

  After the air inside the steel pipe 11 rises through the steel pipe 11 and passes through the vent hole 17, it enters the space between the lid portion 16 and the bulk portion 41, and enters the steel pipe from the vent hole 43 provided in a part of the joining cylinder 15. 11 is discharged to the outside. In addition, air outside the steel pipe 11 enters the space between the lid portion 16 and the bulkhead portion 41 from the vent hole 43 provided in a part of the joining tube 15 and passes through the vent hole 17, and then descends inside the steel pipe 11. The steel pipe 11 is entered.

  Therefore, according to the steel pipe internal rust preventive member 10D according to the present embodiment, the joining cylinder 15 is provided with the lid portion 16 and the bulk portion 41, the lid portion 16 is provided with the vent hole 17, and the bulk portion 41 is provided with the vent hole. 43, and the air hole through which the air 19 (see FIG. 2) passes is configured in a double manner. Therefore, even if the steel pipe 11 is vertical and the flow direction of the air 19 (see FIG. 2) is vertical, the discharge port of the air 19 (see FIG. 2) is directed upward. Infiltration of rainwater into the steel pipe 11 can be further efficiently suppressed, and the occurrence of corrosion inside the steel pipe 11 can be further efficiently suppressed.

  Further, in the steel pipe internal rust preventive member 10D according to the present embodiment, one vent hole 43 is provided in the joining cylinder 15, but the present embodiment is not limited to this, and the vent hole 43 is A plurality of joining cylinders 15 may be provided.

  Further, in the steel pipe internal rust prevention member 10D according to the present embodiment, the joining cylinder 15 is provided on the inner periphery of the steel pipe 11, but this embodiment is not limited to this, and is shown in FIG. As described above, the joining cylinder 15 may be provided on the outer periphery of the steel pipe 11.

10A-10D Steel pipe internal rust prevention member 11 Steel pipe 12 Opening part 13A-13G, 31A, 31B, 42A, 42B Lid member 15 Joint cylinder 16, 16-1, 16-2 Lid part 17, 17-1, 17-2, 32, 43 Vent 18 Seal member 19 Air 21 Vaporizable rust inhibitor 22 Vaporized gas 23 Condensed water 24A-24E, 24A-1, 24A-2 Tubular portion 25 Brim portion 26 Bending portion 27 Bellows member 28 End portion 33 Welding 41 Umbrella

Claims (7)

A steel pipe internal rust preventive member provided with lid members provided at openings at both ends of the steel pipe,
The lid member is
A joining cylinder disposed on the outer peripheral surface of the steel pipe so that one end side is located at the end of the steel pipe ;
A lid portion provided to close the other end side of the joining cylinder, and having a vent hole;
A steel pipe interior having a tubular portion extending from an opening edge portion of the vent hole in the lid portion to the inside of the steel tube and having a bent portion that bends at least partially continuously. Rust prevention member. A steel pipe internal rust preventive member provided with lid members provided at openings at both ends of the steel pipe,
The lid member is
A joining cylinder disposed on the outer peripheral surface of the steel pipe so that one end side is located at the end of the steel pipe ;
A lid portion provided to close the other end side of the joining cylinder, and having a vent hole;
A cylindrical portion extending from the opening edge of the vent in the lid to the outside of the steel pipe;
A steel pipe internal rust preventive member, comprising: a flange portion provided at an end portion of the joint cylinder and extending from the joint cylinder toward an outside of the steel pipe. In claim 1 or 2,
A part of the joining cylinder is a bellows member. In any one of Claims 1 thru | or 3,
A steel pipe internal rust preventive member characterized in that a part of the cylindrical portion is refracted into a hook shape. A steel pipe internal rust preventive member having lid members provided at openings at both ends of the steel pipe,
The lid member is
A joining cylinder provided on the outer peripheral side surface of the steel pipe and provided with a vent so that one end side is located at the end of the steel pipe;
A first lid that is provided to close the other end of the joining cylinder and has a vent;
A second lid portion provided between the first lid portion in the joining tube and the steel pipe and having a vent hole ;
The first lid portion and the second lid portion are respectively cylindrical portions provided on the opening edge portions of the vent holes of the first lid portion and the second lid portion so as to extend outside the steel pipe. Yes, and
The cylindrical portions of the first lid portion and the second lid portion are installed so that the positions of the vent holes of the first lid portion and the second lid portion in the cylinder axis direction do not overlap each other. steel internal anticorrosive member, characterized in Tei Rukoto. A steel pipe internal rust preventive member having lid members provided at openings at both ends of the steel pipe,
The lid member is
A joining tube disposed on the inner peripheral surface of the steel pipe so that the other end side is located at the end of the steel pipe ;
A first lid provided inside the steel pipe and at one end of the joining tube, and having a vent;
A second lid portion provided outside the steel pipe and at the other end of the joining tube, formed larger than the outer periphery of the steel pipe, and having a vent hole ;
The first lid portion and the second lid portion are respectively cylindrical portions provided on the opening edge portions of the vent holes of the first lid portion and the second lid portion so as to extend outside the steel pipe. Yes, and
The cylindrical portions of the first lid portion and the second lid portion are installed so that the positions of the vent holes of the first lid portion and the second lid portion in the cylinder axis direction do not overlap each other. steel internal anticorrosive member, characterized in Tei Rukoto. In any one of Claims 1 thru | or 6 ,
A steel pipe internal rust preventive member characterized by having a vaporizable rust preventive that is installed inside the steel pipe and generates vaporized gas to keep the vaporized gas inside the steel pipe at an effective concentration .

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