JPH0514158B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Field This invention relates to pipe connection parts that are required to be subjected to anti-corrosion construction in factories, for example, or pipe connection parts that are coated with a foam to prevent rust from forming on the pipe connection parts. This relates to anti-corrosion construction methods. BACKGROUND TECHNOLOGY Conventionally, as a corrosion-proofing construction method for pipe connections connected via flange joints at factory sites, for example, when the pipe connections are in a normal form such as a straight line or a T-shape, 1986-
As shown in Publication No. 31794, the pipe connection part is covered with a cover body while maintaining a space, the cover body is attached to the pipe, and a foamed resin molding material is injected through an injection hole provided in a part of the cover body. A corrosion-proof construction method for a pipe connection part is already known, in which the outer periphery of the pipe connection part is sealed with a foamed resin by filling a space inside the cover body with a foamed resin. Problems to be Solved by the Invention In the conventional method described above, a cover body having a predetermined shape that is pre-formed according to the shape and size of the pipe connection part is used. If the connecting part of the pipe is not a normal shape such as a straight line or T-shape, but is irregularly shaped, each cover body must be manufactured to suit the individual shape and size. The problem was that it was very troublesome. Therefore, conventionally, as a corrosion-proof construction method for such irregularly shaped parts, a method of wrapping an anti-corrosion tape to seal the part has been common. In other words, in order to apply corrosion protection to an irregularly shaped pipe connection, first clean the surface of the flange by removing foreign matter such as dirt with a wire brush, keren hammer, etc., and then apply a primer such as petrolatum-based paste to this surface. After coating, the gap between the flanges was filled with a filler such as petrolatum-based mastic, and an anti-corrosion tape such as petrolatum-based anti-corrosion tape was then wrapped to seal the flanges. However, according to the conventional method for connecting such irregularly shaped pipes, it is troublesome to fill the gaps between the flanges with filler, and the anticorrosion tape is completely applied to such irregularly shaped parts so that no voids are formed. There was a problem in that the work of winding the wire around the wire was time-consuming and workability was poor. The purpose of this invention is to solve the above-mentioned problems of the prior art, and to achieve efficient work in a short time with extremely simple workability, even when the connecting part of the pipe is irregularly shaped, such as when the pipe itself is bent. It is possible to carry out anti-corrosion construction well, and in addition to obtaining a sufficient anti-corrosion effect,
Unlike conventional methods, it is not necessary to manufacture a cover body individually according to the shape and size of each pipe connection part, and by using a foam molding tool consisting of a hard sheet part for molding and a soft sheet part for molding, it is possible to reduce the cost. The purpose of the present invention is to provide an economical method for carrying out anti-corrosion construction on pipe connection parts. Means for Solving the Problems In order to achieve the above object, the first aspect of this invention is to solve the problem.
The invention relates to a bendable, substantially rectangular hard sheet part for molding that is large enough to cover a pipe connection part etc. to be subjected to corrosion protection with a required gap, and both side edges of this hard sheet part for molding. It consists of a foam molding tool consisting of a soft molding sheet part provided to extend these parts, and a tightening member that wraps and ties the molding soft sheet part around the pipe, and the pipe connecting part etc. Provided in the hard molding sheet part in a gap covered by the bent hard molding sheet part and formed by the soft molding sheet parts on both sides being tightly wound around the tube and tied. Corrosion-proof foam coating for pipe connection parts, etc., in which a synthetic resin or synthetic rubber foam raw material is injected through an opening, and foam molding is performed to form a corrosion-proof foam coating material that covers pipe connection parts, etc. It features a material forming device. Further, in a second aspect of the present invention, the foam molding tool is constituted by a hard sheet part for molding and a soft sheet part for molding provided on one side edge of the molding tool, and a pipe connecting part etc. are covered by a bent vertical hard sheet for molding, and the lower soft sheet for molding is tightly wound around the tube and tied up in an upwardly opening space. Formation of anti-corrosion foam coating material for pipe connection parts, etc., in which a synthetic resin or synthetic rubber foam raw material is injected and foam molded to form an anti-corrosion foam coating material that covers pipe connection parts, etc. It features a device. In the above, the foam may be a foam of synthetic resin such as polyurethane resin, silicone resin, or epoxy resin, or a foam of rubber such as polyurethane rubber or silicone rubber. The foam raw material is made by mixing a required amount of a blowing agent with a synthetic resin or rubber base material. Here, the foam raw material is preferably one that reacts, foams, and hardens at room temperature. In order to further improve the corrosion resistance of such a foam raw material, it is of course possible to add various anti-corrosion additives to the foam raw material. Further, the above-mentioned foam molding tool includes a bendable, substantially rectangular hard sheet part for molding, which has a size that covers the pipe connection part etc. to be subjected to anti-corrosion construction with a required gap, and a hard sheet part for molding which is bendable. and a moldable soft sheet portion extending from at least one side edge of the left and right side edges. Here, the hard sheet part for molding is made of a hard sheet made of synthetic resin such as polycarbonate resin, hard polyvinyl chloride resin, polyethylene resin, polypropylene resin, etc., and is made of a transparent or semi-transparent sheet so that the inside can be seen through. Preferably, it is transparent. Further, the molding hard sheet portion may be made of other thin metal plates such as iron plates and aluminum plates. The soft sheet for molding is made of a soft sheet made of a synthetic resin such as soft polyvinyl chloride resin, polyethylene resin, or polypropylene resin, and is attached to the connecting side edge of the hard sheet for molding by, for example, fusion. Alternatively, they are joined by bonding using an adhesive, and the soft molding sheet part is preferably transparent or translucent so that the inside can be seen through, as in the case of the above-mentioned hard molding sheet part. Note that since a synthetic resin film can be used as long as it has sufficient strength, such a film is included in the above-mentioned soft sheet. Moreover, the material of the soft sheet for molding is not limited to the above-mentioned synthetic resin, but other materials can also be used. In addition, a long foam molding tool can be obtained by continuously joining a hard sheet that constitutes the hard sheet for molding and soft sheets that constitute the soft sheet for molding on both sides. , which can be cut to the required size and used. In such a foam molding tool, the rigid molding sheet part is bent to cover the pipe connection part, etc. with a required gap, and the connecting side edges of the molding rigid sheet part are connected to each other. Here, as a means for interconnecting the connecting side edges of the hard sheet parts for molding, for example, double-sided adhesive tape, single-sided adhesive tape, instant adhesive, stapler, etc. can be used. Can be used. Further, as a means for providing an opening in the cylinder formed by the hard sheet for molding, for example, a substantially U-shaped notch is provided in advance on the connecting side edge of the hard sheet for molding, and the hard sheet for molding is When bending the sheet portion and connecting the connecting side edges thereof, an opening of the required size is made by both notches, or a cylinder formed from a hard sheet portion for molding is used. An opening of the required size may be made at the required location using a cutter or scissors. Further, the tightening member may be any member that wraps and ties the soft molding sheet portion around the tube,
For example, various strings, adhesive tapes, wires, synthetic resin-coated wires, etc. may be used, but other commercially available tightening members, such as a cylindrical head for insertion having a through hole at one end of a synthetic resin strip, are integrated. The through hole is provided with a stainless steel detent protrusion, and the other end of the band is inserted into the through hole of the cylindrical head to form an annular shape, which is gradually narrowed. Of course, it is also possible to use a tightening member that can tie the moldable soft sheet portion to the tube. Note that the method of the present invention is applicable to irregularly shaped pipe connections connected via pipe joints such as flange joints, elbow joints, and T-tube cheese joints, or to two pipe ends to be connected to each other. The present invention can be applied to corrosion-proofing work on straight pipe connecting parts such as screwing together male threaded parts and female threaded parts, as well as required straight pipe parts or bent pipe parts in the middle of piping. In addition, when performing anti-corrosion work on pipe connection parts, etc., wipe the base surface of the pipe connection part etc. with a rag or the like in advance to remove moisture, etc., and use a wire brush etc. to remove floating rust, dirt, dirt, foreign substances, etc. It is desirable to completely remove surface deposits such as, etc. from the base surface. In some cases, on the base surface after adjustment,
For example, a primer such as petrolatum paste is applied uniformly using a cloth, a spatula, or a roller bucket, and then a petrolatum anticorrosive tape is applied over the paste, such as a tape base material impregnated with a petrolatum anticorrosive agent. You may also wrap it with anti-corrosion tape such as . Embodiments Next, embodiments of the present invention will be described based on the drawings. Note that the drawings show the method of the present invention in the order of steps. In FIG. 1, flange joints 2, 2 are attached to the connecting ends of two pipes 1, 1, respectively, and the pipes are connected via these flange joints 2, 2. Here, the outer diameter of each tube 1 is 114.3 mm, and the outer diameter of each flange joint 2 is 210 mm. When performing anti-corrosion construction on the irregularly shaped pipe connecting portion 3 connected by the required number of bolts 7 and nuts 8 via the flange joints 2, 2 as described above by the method of the present invention, first, the pipe connecting portion 3 is The base surface was wiped to remove water and other stains, and surface deposits such as floating rust, dust, dirt, and foreign matter were completely removed from the base surface using a tool such as a wire brush. Next, an anticorrosion paste such as a petrolatum-based paste was uniformly applied as an undercoat onto the base surface of the pipe connection portion 3 after being adjusted in this manner using a rag, a spatula, a roller bucket, or the like. On the other hand, as shown in FIG. 2, a substantially rectangular molded piece made of a bendable hard polyvinyl chloride resin is sized to cover the pipe connection part 3 to be subjected to anti-corrosion construction with a required gap 15. It is composed of a hard sheet part 11 and soft molding sheet parts 12, 12 made of soft polyvinyl chloride resin, which are fused to the right and left side edges of the hard molding sheet part 11 so as to extend the same. A foam molding tool 10 (FIG. 1A) and tightening members 13, 13 (FIG. 2B) for wrapping and tying the molding soft sheet parts 12, 12 around the tube 1 were prepared. Here, the foam molding tool 10 continuously fuses and joins a hard sheet constituting the hard sheet part 11 for molding and soft sheets constituting the soft sheet parts 12 for molding on both sides thereof. By doing this, a long piece can be obtained, which can be cut to the required size and used. In this example, the width of the hard sheet part 11 for molding is 140 mm, and the soft sheet part for molding on both sides is 140 mm. The width of parts 12 and 12 are respectively
A 250 mm foam molding tool 10 was used. Further, when the hard sheet part 11 for molding is bent to form the cylindrical body 14 that covers the pipe connection part 3, the hard sheet part 11 for molding is made in advance so that a rectangular opening 16 with a size of, for example, 20 x 50 mm is opened. Connecting side edge 1 of
Approximately U-shaped notches 18, 18 are provided in 1a, 11a. Note that the shape of the opening 16 is not limited to that shown in the drawings, and may be other shapes such as a circle or an ellipse. As shown in FIG. 2B, the tightening member 13 includes a cylindrical insertion head 21 having a through hole 22 at one end of a synthetic resin strip 20 with a length of about 30 mm, a width of 5 mm, and a thickness of 1 mm. A detent protrusion 2 made of stainless steel is provided inside the through hole 22.
A commercially available tightening member equipped with No. 3 was used. Next, as shown in Figures 3 and 4,
The molding hard sheet part 11 of the foam molding tool 10 is bent to cover the pipe connection part 3 with a required gap 15, and the notches in the connecting side edges 11a, 11a of the molding hard sheet part 11 are bent. Both sides of the parts 18, 18 were connected to each other via double-sided adhesive tapes 24, 24 to form a cylinder 14, and an opening 16 was formed in the cylinder 14. Furthermore, the molding soft sheet parts 12, 12 on both side edges of this cylinder 14 are wound around the tubes 1, 1, respectively, and the other end of the band-like part 20 is inserted into the through hole 22 of the cylindrical head 21 of each tightening member 13. The soft sheet parts 12, 12 for molding are tightly bound to the tubes 1, 1 by the tightening members 13, 13, respectively, by inserting the parts to form an annular shape and gradually squeezing this. Walls 17, 17 were formed. Next, as shown in FIG. 5, a two-component polyurethane foam raw material 5 containing polyisocyanate, polyol, and a blowing agent as main ingredients is uniformly mixed in a predetermined polyurethane container 25, and then the polyurethane foam raw material 5 is mixed uniformly in a predetermined plastic container 25. 5 was injected into the cavity 15 through the opening 16 of the cylinder 14. As shown in FIGS. 6 and 7, by foaming this at room temperature, it adheres closely to the surface of the pipe connection part 3 and the tube body 14 and side wall 17,
A foamed covering material 6 was formed along the inner surface of 17.
In addition, when foaming the foam raw material 5, the soft foam raw material 5 in a paste state sufficiently penetrates into the gap between the flange joints 2, 2 due to the foaming pressure, completely sealing the gap between the flange joints 2, 2. We were able to. Finally, as shown in FIG.
0 and the tightening members 13, 13 were removed, and the foam covering material 6 was exposed to the outside. In addition, in some cases, such a molding tool 1 In addition, in the above embodiment, a hard sheet part for molding 1
It is of course possible to leave the 0 and the tightening members 13, 13 attached without removing them. Next, in order to confirm the anticorrosion effect of the pipe connection part 3 having the foamed covering material 6 formed in the above example, a salt spray test was conducted in accordance with the method prescribed in JIS standard Z2371, and the results were 500 hours. Even after the test, no rust was observed, and it had excellent corrosion resistance of class A. In the above embodiment, a petrolatum-based paste is applied to the base surface of the pipe connection portion 3, and the foamed covering material 6 is formed on this petrolatum-based paste, but if even stricter corrosion resistance is required, A petrolatum-based anti-corrosion tape (not shown) is further wrapped around the surface of the pipe connection portion 3 coated with the petrolatum-based paste, and the foamed covering material 6 is applied over the anti-corrosion tape in the same manner as in the above embodiment.
It is preferable to form . According to the method of the present invention, the pipe connecting portion 3 can be completely hermetically covered with the foamed covering material 6, so a petrolatum-based paste as described above or a petrolatum-based anticorrosion tape may be applied in advance. Even when winding the pipe, it is not necessary to completely seal the pipe connecting portion 3, so the work is simple and has excellent workability. In addition, in the above embodiment, the case where the method of the present invention is applied to the pipe connecting portion 3 connected via the flange joints 2, 2 was explained, but the method of the present invention is also applicable to other elbow joints, T-shaped pipes, etc. Irregular-shaped pipe connection parts connected through pipe joints such as cheese joints, or straight pipe connections by threading the male and female threads provided at the ends of two pipes to be connected to each other. It can be applied in exactly the same way to anti-corrosion construction of sections, as well as required straight pipe sections and bent pipe sections in the middle of piping. In addition, in the above embodiment, the hard sheet part for molding 1
The present invention is carried out by placing a foam molding tool 10 in a horizontal state, which has soft molding sheet parts 12, 12 joined to the left and right edges of the foam molding member 1 so as to extend these parts, but the present invention is not limited thereto. First, the present invention may be carried out by arranging the foam molding tool 10 in a vertical position, which includes the soft molding sheet part 12 joined to one side edge of the hard molding sheet part 11 so as to extend this. can. In addition, in this case, the hard sheet part 11 for molding
A vertical cylinder 14 with an opening facing upward.
At the same time, by tightly binding the molding soft sheet part 12 to the tube 1 with the tightening member 13, a bottom wall 1 continuous to the lower edge of the cylinder body 14 is formed.
7 may be formed. Effects of the Invention As described above, the apparatus for forming an anti-corrosion foam coating material for a pipe connection part, etc. of the present invention is as follows. It is composed of a roughly rectangular hard sheet part for molding which has a large size and is bendable, and soft sheet parts for molding provided on both side edges of this hard sheet part for molding so as to extend these. It consists of a foam molding tool and a tightening member that wraps and ties the soft sheet for molding around the pipe, and the pipe connection part etc. is covered by the bent hard sheet for molding, and the soft sheet for molding is attached on both sides. A synthetic resin or synthetic rubber foam raw material is injected through an opening provided in the hard molding sheet into the gap formed when the part is tightly wound around the pipe and tied, and the pipe is formed by foam molding. This product is designed to form an anti-corrosion foam coating that covers the connection parts, etc., and is an extremely easy process even if the connection part of the pipe is irregularly shaped, for example if the pipe itself is bent. Therefore, corrosion protection can be carried out efficiently in a short period of time, and a sufficient corrosion protection effect can be obtained. Furthermore, a long foam molding tool made by continuously joining a hard sheet constituting the hard sheet portion for molding and soft sheets constituting the soft sheet portions for molding on both sides of the hard sheet can be made into a desired size. Since it can be used by cutting it into pieces, it is flexible and can be applied to pipe connections of various sizes, and unlike conventional methods, cover bodies can be manufactured individually to suit individual shapes and sizes. No hassle. Furthermore, since the foam molding tool is made of a hard sheet and a soft sheet of synthetic resin and can be manufactured at low cost, the cost of anticorrosive construction is also low, resulting in an economical effect. Further, according to the second aspect of the present invention, the foam molding tool is constituted by a hard sheet part for molding and a soft sheet part for molding provided on one side edge of the molding tool, and Inside the upwardly opening void formed by the lower part of the molding sheet covered by a bent vertical hard molding sheet part and tightly wound and tied around a tube. A foam raw material of synthetic resin or synthetic rubber is injected into the material, and foam molding is performed to form an anti-corrosion foam coating material that covers pipe connection parts, etc. Especially when pipe connection parts are vertically shaped. This applies when the system is placed. In the case of the second invention, since the bent hard sheet part for molding is arranged vertically and the opening is formed upward, there is no need to take the trouble of providing an opening in the hard sheet part, and one side of the sheet It is only necessary to tightly fix the pipe to the pipe, making the work even easier. In addition, since it is only necessary to continuously provide the soft sheet part for molding on one side edge of the hard sheet part for molding, the manufacturing cost of the molding tool is further reduced, and the cost of anti-corrosion construction is further reduced. play.

[Brief explanation of the drawing]

The drawings are for explaining the method of the present invention step by step. Figure 1 is a front view of a pipe connection section connected via a flange joint and to be subjected to anti-corrosion construction, and Figure 2 is a diagram used in the method of the present invention. A plan view showing the forming tool (A in the same figure) and a tightening member (B in the same figure), FIG. 3 is a perspective view of the forming tool attached to the pipe connection part, FIG. The figure is a perspective view of a state in which the foam raw material is injected into the void in the forming tool attached to the pipe connecting part, and FIG. 6 is a perspective view of the pipe connecting part with the forming tool showing the state in which the foam raw material is being foamed. Figure 7 is a perspective view showing the state of the foam raw material after foaming;
The figure is a partially cutaway front view of a pipe connection part with a foam covering. DESCRIPTION OF SYMBOLS 1... Pipe, 2... Flange joint, 3... Pipe connection part, 5... Foam raw material, 6... Foam covering member, 1
0... Molding tool, 11... Hard sheet part for molding, 1
1a, 11a... Connection side edge, 12... Soft sheet part for molding, 13... Tightening member, 14... Cylindrical body,
15...Gap, 16...Opening, 17...Side wall.

Claims (1)

[Claims] 1. A pipe connecting portion or pipe portion (hereinafter referred to as a pipe connecting portion, etc.) 3 to be subjected to anti-corrosion construction with a required gap 15
a roughly rectangular hard molding sheet part 11 that is large enough to cover the open state and bendable; and a molding soft sheet part 11 provided on both side edges of this hard molding sheet part 11 so as to extend these parts. seat part 12,
a foam molding tool 10 constituted by 12;
It consists of tightening members 13, 13 that wrap and tie the soft sheet parts 12, 12 for molding around the pipe 1, and the pipe connecting part 3 is covered by the bent hard sheet part 11 for molding, and the molding parts on both sides Soft sheet portion 12,
A foam raw material of synthetic resin or synthetic rubber is injected through an opening 16 provided in the hard molding sheet part 11 into a gap 15 formed by tightly winding and tying the molding material 12 around the tube 1. An apparatus for forming an anticorrosive foam coating material for pipe connection parts, etc., which forms an anticorrosion foam coating material 6 for covering pipe connection parts, etc. by foam molding. 2. A substantially rectangular molding hard sheet part 11 that is large enough to cover the pipe connection part 3 to be subjected to corrosion protection with a required gap 15 and is bendable, and one part of this molding hard sheet part 11. A soft sheet part 12 for molding is provided to extend the side edge part.
A vertical hard sheet part for molding with a bent pipe connection part 3, which is composed of a foam molding tool 10 constituted by a foam molding tool 10, and a tightening member 13 that wraps and ties a soft molding sheet part 12 around a pipe 1. 11, and is formed by the lower molding soft sheet parts 12, 12 being tightly wound around the tube 1 and tied up, into an upwardly opening cavity 15.
Formation of anticorrosive foam coating material for pipe connection parts, etc., in which a synthetic resin or synthetic rubber foam raw material is injected and foam molded to form anticorrosion foam coating material 6 that covers pipe connection parts, etc. Device.