JP2007198581A - Corrosion proof tool for pipe end - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to protect the corrosion of the pipe end face of an insertion pipe after cutting the pipe, the base face and the side face of a fitting groove for an insertion ring with one anticorrosive tools: to get an excellent effect for stopping water of the pipe end face of the insertion pipe as there is no protrusion on the inner circumference face of the insertion pipe. <P>SOLUTION: In an anticorrosive tools for the pipe end part to protect the corrosion of a fitting groove 3A for the insertion ring 7 with the slit which is formed on the outer circumference face of the above pipe end part by putting over the pipe end part of the insertion pipe 3 and a pipe end face 3B of the insertion pipe 3 after cutting, it is constituted of the outer circumference part 1A which is covered on the outer circumference face of the above pipe end part and the side part 1B which is covered on the pipe end face and a swelling part C for stopping water is formed to the inner circumference end. <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. 9, it is formed on the inner peripheral surface of the stopper pipe 4 projecting from the distal end outer peripheral portion of the insertion pipe 3 and the receiving pipe 5 into which the insertion pipe 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. 10 and 11, 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 widened when the tube is connected, so that the diameter of the insertion ring 7 can be increased or decreased. 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. 12 is a cross-sectional view showing a conventional corrosion protection device.

  As shown in FIG. 12, the conventional anticorrosive tool includes a tube end surface anticorrosive material 9 that prevents the tube end surface 3B of the insertion tube 3 after cutting the tube, and a locking groove 3A into 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) Since the inner peripheral portion 9C protrudes from the inner peripheral surface of the insertion tube 3, the flow in the conduit is disturbed, causing noise and the like.

  Therefore, the object of the present invention is to prevent corrosion of 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 project from the inner peripheral surface of the insertion tube. In addition, an object of the present invention is to provide an anticorrosive tool for a pipe end having an excellent water stop effect.

  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 for anticorrosion of the stop groove and the pipe end surface of the insertion tube, the pipe groove includes an outer peripheral portion that covers the outer peripheral surface of the pipe end portion, and a side surface portion that covers the pipe end surface, A feature is that a bulging portion for water stop is formed at the inner peripheral end of the side surface portion.

  According to a second aspect of the present invention, in the first aspect of the invention, a cover is provided on the 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.

  A third aspect of the invention is characterized in that, in the second aspect of the invention, the cover has a protrusion that enters the locking groove through the outer peripheral portion.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, a thick portion for preventing wrinkles and lifting generated in the outer peripheral portion of the slit portion is formed in a portion of the outer peripheral portion corresponding to the slit. It has the characteristics in being made.

  The invention according to claim 5 is characterized in that, in the invention according to claim 4, the thick portion is formed of a protrusion formed over the longitudinal direction of the outer surface of the outer peripheral portion.

  The invention according to claim 6 is characterized in that, in the invention according to any one of claims 1 to 5, the cross-sectional shape of the bulging portion for water stop is circular, rectangular or U-shaped. Is.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, 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 8 is characterized in that, in the invention described in claim 7, the adhesive material is made of butyl rubber.

  According to this invention, the tube end surface of the insertion tube after cutting the tube and the bottom surface and side surface of the insertion groove for the insertion port ring can be anticorrosive with one anticorrosive tool, and project from the inner peripheral surface of the insertion tube. There is nothing to do, and an excellent water stop effect is obtained.

  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 cross-sectional view showing a tube end anticorrosion tool according to the present invention, FIG. 2 is a view taken along arrow A in FIG. 1, and FIG. FIG. 4 is a partial cross-sectional view of the tube end anticorrosive device of the present invention, and FIG. 5 is a partial perspective view of the tube end anticorrosive device of the present invention provided with a cover. FIG. 6 is a perspective view showing a cover of another shape, FIG. 7 is a partial perspective view showing another anticorrosive tool for a pipe end of the present invention, and FIG. 8 is a front view showing the protrusion of FIG. Yes, (a) shows a rectangular ridge, and (b) shows a trapezoidal ridge.

  As shown in FIG. 1 to FIG. 3, the tube end anticorrosion device 1 of the present invention is made of, for example, rubber and has an L-shaped cross section, and covers the outer peripheral surface of the tube end of the insertion tube 3 after cutting. The outer peripheral portion 1A and the side surface portion 1B that covers the tube end surface 3B of the insertion tube 3 after cutting are formed, and a water stop bulging portion 1C is formed at the inner peripheral end of the side surface portion 1B. It is made up of. The length (L) of the outer peripheral portion 1A has a length sufficient to cover the insertion port ring locking groove 3A.

  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 7A 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. In addition, since the water stop bulging portion 1C is pressed by the insertion port ring 7, it is possible to reliably prevent intrusion of water or the like from the inner peripheral end of the side surface portion 1B.

  As shown in FIG. 4A, the cross-sectional shape of the water stop bulging portion 1C is rectangular as shown in FIG. 4B, as shown in FIG. 4B, and as shown in FIG. The shape may be a semicircular shape, as shown in FIG. 4D, or a hollow shape, as shown in FIGS. Further, as shown in FIG. 9H, the inner side and the outer side may be formed in a semicircular shape having different radii.

  As shown in FIG. 9, the insertion port ring 7 is fixed to the tube end portion of the insertion tube 3 by screws 8. At this time, the diameter of the slit 7 </ b> A of the insertion port ring 7 is reduced due to the reduced diameter of the insertion port ring 7. A wrinkle or a lift may occur in the outer peripheral portion 1A of the tube end anticorrosive 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. 5, a T-shaped cover 2 made of a resin or the like is attached in advance 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, If the insertion port ring 7 and both ends of the cover 2 are wrapped, the outer peripheral portion 1A is pressed by the cover 2 when the insertion port ring 7 is fixed. This can be surely prevented. The reason why the shape of the cover 2 is T-shaped is to avoid interference between the protrusion 7B of the insertion port ring 7 and the cover 2.

  As the shape of the cover 2, as shown in FIG. 6A, a protrusion 2A is provided on the T-shaped cover 2, and the protrusion 2A is inserted through the outer peripheral part 1A and the locking groove 3A for the insertion port ring If it gets in, it can prevent a wrinkle and a lift more reliably. Further, as shown in FIG. 5B, a part of the cover 2 is cut out and the part is bent downward to form a protrusion 2A, and the protrusion 2A is inserted through the outer peripheral part 1A into the insertion port ring. You may make it enter in the latching groove 3A for an object. In this case, since the protrusion 7B of the insertion port ring 7 enters the notch, the insertion port ring 7 and both ends of the cover 2 can be wrapped. In addition, as shown in FIG. 5C, if one end of the cover 2 is bent, it can be easily attached to the outer peripheral portion 1A.

  Moreover, even if it forms a thick part in the part corresponding to the slit 7A of the outer peripheral part 1A instead of providing the cover 2, the wrinkles and the lift which arise in the outer peripheral part of a slit part can be prevented. As shown in FIG. 7, the thick portion may be a protrusion 1D formed over the longitudinal direction of the outer surface of the outer peripheral portion 1A. As shown in FIG. 8 (a), the protrusion 1D may be rectangular, trapezoidal as shown in FIG. 8 (b), or although not shown, The end may be inclined in a mountain shape. Further, the cross-sectional shape of the protrusion 1D may be a trapezoidal shape other than the illustrated rectangular shape.

  Furthermore, if an adhesive material such as butyl rubber is attached to the inner surface of the side surface portion 1B of the tube end portion anticorrosive tool 1, the side surface portion 1B is more securely adhered to the tube end surface 3B of the insertion tube 3 to prevent corrosion. Will improve. Further, if an adhesive material such as butyl rubber is attached to the inner surface of the outer peripheral portion 1A where the slit of the insertion port ring 7 is located, the effect of preventing wrinkles and lifting by the cover 2 is further improved.

  As described above, according to the anticorrosive tool for pipe ends of the present invention, the pipe end surface 1B of the insertion tube 3 after cutting the tube and the bottom and side surfaces of the insertion groove 1A for the insertion ring are used as one anticorrosive device. Since the anticorrosion can be performed, the anticorrosion treatment can be easily performed, there is no risk of loss, and there is nothing that protrudes from the inner peripheral surface of the insertion tube 1, so that there is no possibility of disturbing the water flow in the pipe. And the outstanding water stop effect is acquired by providing 1 C of bulging parts for water stop. Furthermore, by providing the cover 2 on the outer peripheral portion 1A corresponding to the slit 7A of the insertion port ring 7, it is possible to reliably prevent wrinkles and lifting that occur in the outer peripheral portion 1A of the slit 7A portion when the insertion port ring 7 is fixed. .

It is sectional drawing which shows the anticorrosive 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 sectional view of the corrosion prevention tool for pipe ends of this invention. It is a fragmentary perspective view which shows the anti-corrosion tool for pipe ends of this invention which provided the cover. It is a perspective view which shows the cover of another shape. It is a fragmentary perspective view which shows another anticorrosive tool for pipe ends of this invention. It is a front view which shows the protrusion of FIG. 7, (a) shows a rectangular protrusion, (b) shows a trapezoid protrusion. 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: Tube end anticorrosion tool 1A: Outer peripheral portion 1B: Side surface portion 1C: Water stop bulging portion 1D: Projection 2: Cover 2A: Projection 3: Insertion tube 3A: Locking groove 3B: Tube end surface 4 : Stopper 5: Receptacle tube 5A: Groove 5B: End face 6: Lock ring 7: Insertion ring 7A: Slit 7B: Projection 8: Screw 9: Pipe end face anticorrosive 9A: Outer peripheral part 9B: Side part 9C: Inner peripheral part 10: Locking groove anticorrosive material

Claims (8)

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,
It consists of an outer peripheral part that covers the outer peripheral surface of the pipe end part and a side part that covers the pipe end face, and a bulging part for water stop is formed at the inner peripheral end of the side part. Corrosion protection for pipe ends.   A cover is provided on an outer surface of the outer peripheral portion, and the cover positions the slit of the insertion port ring on the cover when the insertion port ring is fixed to the tube end portion. 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 a protrusion which penetrates into the said locking groove via the said outer peripheral part, The anticorrosive tool for pipe ends of Claim 2 characterized by the above-mentioned.   2. The tube end according to claim 1, wherein a wall portion corresponding to the slit of the outer peripheral portion is formed with a thick portion that prevents wrinkles and floating generated in the outer peripheral portion of the slit portion. Anticorrosive for clubs.   The said thick part consists of a protrusion formed over the longitudinal direction of the outer surface of the said outer peripheral part, The anticorrosive tool for pipe ends of Claim 4 characterized by the above-mentioned.   The anticorrosive tool for a pipe end part according to any one of claims 1 to 5, wherein the cross-sectional shape of the bulging part for water stop is circular, rectangular or U-shaped.   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 ring is located, The any one of Claim 1 to 6 characterized by the above-mentioned. The anticorrosive tool for pipe ends as described in 2.   The said anti-adhesive material consists of butyl rubber, The anticorrosive tool for pipe ends of Claim 7 characterized by the above-mentioned.

Images