JP2007205443A - Corrosion prevention means for pipe end part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent corrosion of a pipe end face of an insertion pipe after cutting, a bottom surface and side surfaces of an engagement groove for an insert-opening ring with one corrosion prevention means and to prevent an outer peripheral portion of the corrosion prevention means for a pipe end part at a slot portion of the insert-opening ring from being crinkled or lifted when securing the insert-opening ring. <P>SOLUTION: The engagement groove 3A is formed on the outer peripheral surface of the pipe end part of the metallic insertion pipe 3. The insertion-opening ring 7 with a slit includes a projection 7B that is fitted in the engagement groove 3A when the insertion-opening ring 7 is capped over the pipe end part of the insertion pipe 3 after cutting. The corrosion prevention means for the pipe end part to prevent corrosion of the engagement groove 3A and the pipe end surface 3B of the insertion pipe 3, comprises the outer peripheral portion 1A laid on the outer peripheral surface of the pipe end part, a side face portion 1B laid on the pipe end face, an inner peripheral portion 1C laid on an inner peripheral surface of the pipe end part, and a cover 2 arranged on an external surface of the outer peripheral portion 1A. By locating the slit of the insert-opening ring 7 on the cover 2 when securing the insert-opening ring 7 to the pipe end part, the cover 2 prevents the outer peripheral portion 1A at the slit portion from crinkling or upfloating. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention is a pipe end anticorrosion tool, in particular, for example, when laying a water pipe, for the convenience of piping, in the piping construction site, when the pipe is cut from the middle, the pipe end of the insertion pipe after cutting The present invention relates to a tube end anticorrosion tool that can reliably prevent corrosion of a portion.

  In recent years, pipe joint structures having a detachment preventing function and an expansion / contraction function are being adopted as a seismic countermeasure for water pipes and the like.

  As an example of this pipe joint structure, as shown in FIG. 6, it is formed on the inner peripheral surface of the stopper tube 4 protruding from the outer periphery of the distal end of the insertion tube 3 and the receiving tube 5 into which the insertion tube 3 is inserted. Some of them have a lock ring 6 fitted in the groove 5A.

  According to this pipe joint structure, the insertion tube 3 can be expanded and contracted from the position where the tip end of the insertion tube 3 comes into contact with the back end surface 5B of the receiving tube 5 to the position where the stopper 4 comes into contact with the lock ring 6. . Further, even when a tensile force acts on the pipe joint portion, the stopper 4 comes into contact with the lock ring 6 to reliably prevent the pipe from being detached from the joint portion.

  When connecting a pipe | tube by the pipe joint structure which has the earthquake-resistant function mentioned above, and laying a pipe line, on the piping construction site, the pipe | tube must be cut from the middle on account of piping. In this way, when the tube is cut from the middle, if the metal insertion ring described later is not newly attached to the cut end of the tube, the insertion tube 3 is inserted into the receiving tube 5 and the tube is connected. Can not do it.

  As shown in FIGS. 7 and 8, the insertion port ring 7 is formed with a tapered tip so that the lock ring 6 in the receiving tube 5 can be pushed and expanded so that the diameter of the insertion ring 7 can be expanded and contracted. A slit 7A is formed on the surface. And the protrusion 7B which fits into the locking groove 3A formed in the outer peripheral surface of the pipe | tube end part of the insertion port pipe 3 is formed in the inner peripheral surface.

  In order to attach the insertion port ring 7 to the tube end of the insertion tube 3, the diameter of the insertion port ring 7 is increased, and the protrusion 7 </ b> B is inserted into the locking groove 3 </ b> A of the insertion tube 3. Then, the screw 8 is fixed to the insertion tube 3.

  If the insertion ring 7 is fixed to the insertion tube 3 in this way, the insertion tube 3 can be inserted into the reception tube 5 to connect the tube. Since the metal background of the tube end surface 3B of the cut end of the mouth tube 3 is exposed, it is necessary to perform anticorrosion treatment on the tube end surface 3B. Moreover, since the metal ground is similarly exposed in the locking groove 3A newly formed by cutting on the outer peripheral surface of the tube end portion of the insertion tube 3 in order to fit the protrusion 7B of the insertion port ring 7, It is necessary to give anticorrosion treatment. At the stage of shipment from the factory, the pipe end face is coated with anticorrosion.

  Therefore, an example of an anticorrosion tool for anticorrosion between the tube end surface 3B of the insertion tube 3 after cutting the tube and the locking groove 3A into which the protrusion 7B of the insertion ring 7 is fitted is disclosed in Japanese Patent Application Laid-Open No. 2005-248971. It is disclosed. Hereinafter, this anti-corrosion tool is called a conventional anti-corrosion tool and will be described with reference to the drawings.

  FIG. 9 is a cross-sectional view showing a conventional corrosion protection device.

  As shown in FIG. 9, the conventional anticorrosive tool has a tube end surface anticorrosive material 9 for anticorrosion of the tube end surface 3B of the insertion tube 3 after cutting the tube, and a locking groove 3A in which the protrusion 7B of the insertion port ring 7 is fitted. It consists of a locking groove anticorrosive material 10 for anticorrosion. The pipe end surface anticorrosive material 9 covers the outer peripheral part 9A which covers the outer peripheral surface of the pipe end part of the insertion tube 3 after cutting the pipe, the side part 9B which covers the pipe end face 3B, and the inner peripheral surface of the pipe end part. The inner peripheral portion 9C is formed. The locking groove anticorrosive material 10 has the same width as the locking groove 3A.

  According to the conventional anticorrosive tool, after cutting the tube, the tube end surface anticorrosive material 9 is fitted into the tube end portion of the insertion tube 3, and the locking groove anticorrosive material 10 is fitted into the locking groove 3A. As a result, the side surface portion 9B of the tube end surface anticorrosive material 9 is in close contact with the tube end surface 3B of the insertion tube 3, and the locking groove anticorrosion material 10 is in close contact with the locking groove 3A by the protrusion 7B of the insertion port ring 7. Anticorrosion treatment is performed on the tube end surface 3B and the locking groove 3A after the tube is cut. Thereafter, the insertion ring 7 is attached to the tube end of the insertion tube 3.

JP 2005-248971 A

  As described above, according to the conventional anticorrosive tool, the anticorrosion treatment of the tube end surface 3B of the insertion tube 3 and the engagement groove 3A for the insertion port ring 7 after the tube is cut is performed, but there are the following problems. .

(1) Since the anticorrosive tool is divided into two members, the pipe end surface anticorrosive material 9 and the locking groove anticorrosive material 10, the attachment to the insertion tube 3 is troublesome.
(2) Since the locking groove anticorrosive material 10 is thin, there is a risk of cutting when it is attached, and it is small and easily lost.
(3) Since the locking groove anticorrosive material 10 has only a width dimension that covers the bottom surface of the locking groove 3A, the side surface of the locking groove 3A cannot be corroded.
(4) When the insertion port ring 7 is fixed to the pipe end portion, the diameter of the insertion port ring 7 may cause wrinkles or lifting on the outer peripheral portion 9A of the pipe end surface anticorrosive material 9 in the slit 7A portion of the insertion port ring 7. is there. If wrinkles or lifts occur in the outer peripheral portion 9A, the anticorrosive effect of this portion is lost.

  Therefore, the object of the present invention is to reliably prevent the tube end surface after cutting the tube and the bottom and side surfaces of the insertion groove for the insertion port ring with a single anticorrosive tool, and to fix the insertion port ring 7. At the same time, the object is to provide a tube end anticorrosive tool that does not cause wrinkles or lifting at the outer periphery of the tube end anticorrosive tool at the slit portion of the insertion port ring.

  The present invention has been made to achieve the above object, and is characterized by the following.

  According to the first aspect of the present invention, the protrusion of the insertion ring having a slit formed on the outer peripheral surface of the tube end portion is fitted into the tube end portion of the metal tube insertion tube after cutting. In the anticorrosive tool for a pipe end portion that prevents the stop groove and the pipe end surface of the insertion tube, an outer peripheral portion that covers the outer peripheral surface of the pipe end portion, a side surface portion that covers the pipe end surface, and the pipe end And an inner peripheral portion that covers the inner peripheral surface of the portion. The outer peripheral portion has a size that covers the locking groove.

  According to a second aspect of the present invention, in the first aspect of the invention, the cover has a cover provided on an outer surface of the outer peripheral portion, and the cover is arranged on the cover when the insertion ring is fixed to the pipe end portion. By positioning the slit of the insertion port ring, it is possible to prevent wrinkles and lifts generated at the outer peripheral portion of the slit portion.

  The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the cover has a protrusion that enters the locking groove through the outer peripheral portion.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein at least one of the inner surface of the side surface portion and the inner surface of the outer peripheral portion where the slit of the insertion port ring is located. It is characterized in that an adhesive material is provided.

  The invention described in claim 5 is characterized in that, in the invention described in claim 4, the adhesive material is made of butyl rubber.

  According to the present invention, the tube end surface of the insertion tube after cutting the tube and the bottom and side surfaces of the insertion groove for the insertion port ring can be reliably protected with a single anticorrosive tool, and the insertion ring is fixed. In this case, there is an effect that no wrinkles or lifting occurs at the outer peripheral portion of the tube end portion anticorrosive tool at the slit portion of the insertion port ring.

  Next, an embodiment in which the tube end anticorrosive tool of the present invention is applied to a ductile tube insertion tube will be described with reference to the drawings.

  FIG. 1 is a partially omitted cross-sectional view showing a tube end anticorrosive device of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is an insertion opening through the tube end anticorrosive device of the present invention. FIG. 4 is a partial cross-sectional view showing a state in which a ring is attached, FIG. 4 is a partial perspective view of a tube end anticorrosive device of the present invention, and FIG. 5 is a perspective view showing another shape cover.

  As shown in FIGS. 1 to 3, the tube end anticorrosive device 1 of the present invention is made of, for example, rubber and has a U-shaped cross-section, and is formed on the outer peripheral surface of the tube end of the insertion tube 3 after cutting. 1A of outer peripheral parts covered, the side part 1B covered on the pipe end surface 3B of the insertion tube 3 after cutting, the inner peripheral part 1C covered on the inner peripheral surface of the tube end part of the insertion tube 3, and the outer peripheral part 1A And a cover 2 provided on the outer surface of the. The length (L) of the outer peripheral portion 1A has a length sufficient to cover the insertion port ring locking groove 3A.

  The cover 2 holds the outer peripheral portion 1A of the slit 7A portion by positioning the slit 7A of the insertion ring 7 on the cover 2 when the insertion ring 7 is fixed to the tube end of the insertion tube 3. This prevents wrinkles and lifting that occur in the outer peripheral portion 1A. That is, as shown in FIG. 8, the insertion port ring 7 is fixed to the tube end portion of the insertion tube 3 by screws 8. At this time, the slit 7 </ b> A of the insertion port ring 7 is reduced due to the reduced diameter of the insertion port ring 7. In some cases, wrinkles or lifts may occur in the outer peripheral portion 1A of the pipe end portion anticorrosive tool 1. If wrinkles or lifting occurs in the outer peripheral portion 1A, the anticorrosive effect of this portion is lost.

  Therefore, as shown in FIG. 4, if a T-shaped cover 2 made of resin or the like is attached to the upper surface of the outer peripheral portion 1A of the tube end anticorrosive tool 1 corresponding to the slit 7A of the insertion port ring 7, the insertion is performed. Since the outer peripheral portion 1A is pressed by the cover 2 when the mouth ring 7 is fixed, it is possible to reliably prevent wrinkles and lifts from occurring in the outer peripheral portion 1A of the slit 7A portion. The reason why the cover 2 is formed in a T-shape is to avoid interference between the protrusion 7B and the cover 2 when the insertion port ring 7 is fixed.

  As shown in FIG. 5 (a), if the cover 2 is provided with a protrusion 2A and the protrusion 2A enters the insertion groove 3A through the outer peripheral portion 1A, the outer peripheral portion It is possible to more reliably prevent wrinkles and lifting that occur in 1A. As shown in FIG. 5B, the protrusion 2A may be formed by cutting out a part of the cover 2 and bending the part downward. Further, as shown in FIG. 5C, if the end portion of the cover 2 is bent, the cover 2 can be easily attached to the outer peripheral portion 1A.

  As shown in FIG. 3, after the tube end anticorrosive device 1 of the present invention is put on the tube end of the cut insertion tube 3, the tube end 7 is fixed to the tube end. A part of the outer peripheral portion 1A of the part anticorrosive tool 1 is pushed into the insertion ring locking groove 3A by the protrusion 7B of the insertion ring 7, and is in close contact with the bottom and side surfaces of the locking groove 3A. Since the side surface portion 1B of the end anticorrosive tool 1 is in close contact with the tube end surface 3B of the insertion tube 3 after cutting, the anticorrosion treatment of these portions is performed.

  As shown in FIG. 1, an adhesive material 11 such as butyl rubber is provided on at least one of the inner surface of the side surface portion 1B of the tube end portion anticorrosive device 1 of the present invention and the inner surface of the outer peripheral portion 1A where the slit 7A of the insertion port ring 7 is located. If applied, the adhesion of the tube end anticorrosive device 1 is further enhanced. The release paper 12 is pasted on the adhesive material 11 until the tube end anticorrosive device 1 is put on the tube end.

  In order to cover the tube end portion of the anticorrosive device 1 of the present invention and cover the tube end portion of the mouth tube 3, after peeling off the release paper 12, the outer peripheral portion 1A is turned over as shown by the alternate long and short dash line in FIG. In this state, it is fitted into the tube end, and thereafter, the outer peripheral portion 1A is returned to the original state.

  According to the present invention, the tube end surface 3B of the insertion tube 3 after cutting and the bottom surface and side surface of the locking groove 3A can be reliably protected with a single anticorrosive tool, and the slit 7A of the insertion port ring 7 can be prevented. By providing the cover 2 on the outer peripheral portion 1A of the tube end anticorrosion tool 1 corresponding to the above, it is possible to reliably prevent wrinkles and lifts that occur in the outer peripheral portion 1A of the slit 7A portion when the insertion port ring 7 is fixed.

It is a partial abbreviation sectional view showing a corrosion prevention tool for pipe ends of this invention. It is A arrow directional view of FIG. It is a fragmentary sectional view which shows the state which attached the insertion port ring through the anticorrosive tool for pipe ends of this invention. It is a fragmentary perspective view of the anticorrosive tool for pipe ends of this invention. It is a perspective view which shows the cover of another shape. It is sectional drawing which shows an example of a pipe joint structure. It is sectional drawing which shows the insertion ring attached to the insertion tube. It is the sectional view on the AA line of FIG. It is sectional drawing which shows a conventional anti-corrosion tool.

Explanation of symbols

1: Anticorrosive tool 1A for pipe end part: Outer peripheral part 1B: Side face part 1C: Inner peripheral part 2: Cover 2A: Protruding part 3: Insertion pipe 3A: Locking groove 3B: End face of pipe 4: Stopper 5: Receptor pipe 5A : Groove 5B: End surface 6: Lock ring 7: Insertion ring 7A: Slit 7B: Projection 8: Screw 9: Pipe end surface anticorrosive material 9A: Outer peripheral portion 9B: Side surface portion 9C: Inner peripheral portion 10: Locking groove anticorrosive material 11: Adhesive material 12: Release paper

Claims (5)

A locking groove that is formed on the outer peripheral surface of the tube end portion and that fits into the protrusion of the insertion ring having a slit, and is fitted on the tube end portion of the metal tube insertion tube after cutting, and the insertion tube In the tube end anticorrosion tool for preventing corrosion of the tube end surface,
An outer peripheral portion that covers the outer peripheral surface of the tube end portion, a side surface portion that covers the tube end surface, and an inner peripheral portion that covers the inner peripheral surface of the tube end portion, An anticorrosive tool for a tube end having a size covering the groove.   A cover provided on an outer surface of the outer peripheral portion, and the cover is configured to position the slit of the insertion port ring on the cover when the insertion port ring is fixed to the tube end. The anticorrosive tool for pipe ends according to claim 1, wherein wrinkles and lifts occurring in the outer peripheral portion of the portion are prevented.   The said cover has the protrusion part which enters into the said locking groove via the said outer peripheral part, The anticorrosive tool for pipe end parts of Claim 1 or 2 characterized by the above-mentioned.   The adhesive material is provided in at least one of the inner surface of the said side surface part, and the inner surface of the said outer peripheral part in which the said slit of the said insertion port ring is located, Any one of Claim 1 to 3 characterized by the above-mentioned. The anticorrosive tool for pipe ends as described in 2.   The said adhesive material consists of butyl rubber, The anticorrosive tool for pipe ends of Claim 4 characterized by the above-mentioned.

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