JP5872939B2 - Anticorrosion core - Google Patents

Description

  The present invention relates to an anticorrosion core that is inserted to prevent corrosion of a perforated portion formed by perforating a wall of a metal fluid pipe.

  A conventional anticorrosion core is used for anticorrosion of a perforated part formed by perforating a wall of a metal fluid pipe, and has a body part having a continuous circumferential surface in the circumferential direction, and an outer peripheral side of the body part. There are some which are comprised from the anti-corrosion member located (for example, refer to patent documents 1).

JP2011-117572A (5th page, FIG. 2)

  The conventional anticorrosion core described above will be described. First, as shown in FIG. 5, after attaching the cover 11 to the fluid pipe 1, the punching device 50 is sealed against the casing 35 connected to the flange 11 a of the cover 11. It arranges in. The perforating apparatus 50 is connected to a driving means (not shown) and extends in the housing 35 toward the fluid pipe 1 in the axial direction and rotates around the axis, and a fluid pipe fixed to the tip of the shaft member 51. The cutter member 52 mainly includes a cutter member 52, and the cutter member 52 is punched by approaching the outer surface of the fluid pipe 1, and the punching portion 2 is punched in the tube wall of the fluid pipe 1. On the inner peripheral surface 2 a of the perforated part 2, the base material of the metal material constituting the fluid pipe 1 is exposed. In the above-described drilling, the shaft member 51 extending in the axial direction is slightly bent due to the weight of the cutter member 52 at the tip, so that the drilling angle and the drilling position are slightly deviated from the design position (deviation α).

  Next, the insertion of the conventional anticorrosion core 100 into the perforated portion 2 will be described. As shown in FIG. 6A, the anticorrosion core 100 is supported by a jig 60, and the jig 60 is fed. As described above, since the piercing angle and the piercing position of the piercing portion 2 are shifted downward from the design values as described above, the upper end portion 103a in the tube axis direction view is the upper piercing portion 2a. It will contact | abut with respect to the upper part 2b of the peripheral part of this at a higher position.

  As shown in FIG. 6B, when the jig 60 is further sent toward the perforated part 2 in the above-described state, the upper tip part 103a is guided to the upper part 2b of the peripheral part of the perforated part 2, and the anticorrosion core 100 is obtained. Is inclined downward, and the anticorrosion core 100 is inserted at an angle deeper than the drilling angle. Moreover, since the trunk | drum 104 is constant thickness, it is hard to bend, and the anticorrosion core 100 is sent into the perforation part 2 with the whole inclining, and the end surface 102a of the anticorrosion member 102 is in the lower part 2c of the peripheral part of the perforation part 2. Get caught.

  As described above, when the conventional anticorrosion core 100 is inserted into the perforated part 2 in which the perforation angle and the perforation position are deviated from the design values, the end surface 102a of the anticorrosion member is caught on the outer edge of the perforated part 2. Therefore, the anticorrosion member 102 may be rolled up by the outer edge portion of the perforated portion 2 during the fitting operation of the anticorrosion core 100. For this reason, there is a problem that the anticorrosion member 102 cannot be brought into contact with the entire inner peripheral surface of the perforated portion 2 and a sufficient anticorrosion effect cannot be obtained.

  The present invention has been made paying attention to such problems, and even when the drilling angle or the drilling position of the drilled part deviates from the design value, the anticorrosion member is spread over the entire inner peripheral surface of the drilled part. An object of the present invention is to provide an anticorrosion core that can be brought into contact with each other.

In order to solve the above problems, the anticorrosion core of the present invention comprises:
An anticorrosion core that is externally fitted and inserted into a jig in order to prevent corrosion of a perforated portion formed by perforating a tube wall of a metal fluid pipe,
A body portion provided with a corrosion preventing member that contacts the inner peripheral surface of the perforated portion; and a distal end portion projecting inward of the fluid pipe, wherein the distal end portion has a distal end edge having a smaller diameter than the perforated portion. A thin-walled portion having a tapered surface gradually expanding to a larger diameter than the perforated portion toward the anticorrosion member, and having an inner peripheral surface larger in diameter than the inner peripheral surface on the rear end side of the trunk portion, It is characterized by being formed so as to extend over the front end side of the body portion and the front end edge of the front end portion.
According to this feature, when the anticorrosion core is fitted and inserted, the end surface of the anticorrosion member is bent toward the inner diameter direction of the perforation part by the portion where the thin part of the tip part and the body part is formed. Therefore, the end surface of the anticorrosion member can be prevented from being caught on the peripheral portion of the perforated portion. For this reason, even when the drilling angle or the drilling position has deviated from the design value, the anticorrosion member can be reliably brought into contact with the inner peripheral surface of the drilling part, and a sufficient anticorrosion effect can be exhibited. Can do. In addition, since the thin portion is formed on the inner peripheral surface of the anticorrosion core, the thin portion can be formed without the need to modify the outer peripheral surface of the anticorrosion core at the time of design, so that the design is easy.

The anticorrosion core of the present invention is
The taper angle of the tapered surface of the tip portion is characterized by being formed at substantially the same angle over the entire circumference of the tip portion.
According to this feature, since the taper angle of the tapered surface of the tip portion is formed at substantially the same angle over the entire circumference of the tip portion, no matter where the circumferential direction of the taper surface contacts the perforated portion, The load applied to the tip can be dispersed in the circumferential direction without local concentration, and the diameter can be reduced in a uniform manner.

The anticorrosion core of the present invention is
The taper angles of the tapered surfaces of the tip portions on both sides in the tube axis direction are formed to be smaller than the taper angles of the tapered surfaces of the tip portions on both sides in the tube axis direction. Even when the drilling angle or the position of the drilling position is shifted in the drilling part, the taper angle of the tapered surface of the tip part on both sides in the tube axis direction is formed to be relatively small. The displacement can be gradually corrected without applying a large load to the sliding contact portion while gently sliding on the portion.

The anticorrosion core of the present invention is
The thin portion is formed up to the disposition position of the anticorrosion member in the trunk portion.
According to this feature, since at least the end surface of the anticorrosion member bends in the inner diameter direction of the perforated portion, it can be prevented from being caught on the peripheral portion of the perforated portion.

(A) is a side view of the partial cross section of the anticorrosion core in an Example, (b) is a top view of the partial cross section of an anticorrosion core, (c) is a front view of an anticorrosion core. (A) is a partial cross section figure which shows the state which the installation process to the perforation part of the anticorrosion core in an Example started, (b) shows the state in the middle of the installation process to the perforation part of a corrosion prevention core FIG. (A) is a side view of the partial cross section of the anticorrosion core in a modification, (b) is a top view of the partial cross section of the anticorrosion core, (c) is a front view of the anticorrosion core. (A) is a side view of a partial cross section of a conventional anticorrosion core, (b) is a plan view of a partial cross section of the anticorrosion core, and (c) is a front view of the anticorrosion core. It is a partial cross section figure which shows the punching process of a punching part. (A) is a partial cross-sectional view showing a state in which the conventional installation process of the anticorrosion core to the perforated portion is started, and (b) is a diagram illustrating a state in the middle of the installation process of the anticorrosion core to the perforated portion. FIG.

  The form for implementing the anticorrosion core which concerns on this invention is demonstrated below based on an Example.

  The anticorrosion core according to the embodiment will be described with reference to FIGS. As shown in FIG. 2, the fluid pipe 1 of the present embodiment is made of, for example, ductile cast iron for waterworks buried in the ground, is formed in a substantially circular shape in cross section, and has an inner peripheral surface as an anticorrosion treatment. It is covered with a mortar layer, anticorrosive paint, powder resin coating or the like. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel. Furthermore, the fluid flowing inside the fluid pipe may be, for example, water, industrial water, agricultural water, sewage, or the like, gas, or a gas-liquid mixture of gas and liquid. In the following description, the left side of FIG. 2 and FIG.

  As shown in FIGS. 1 (a) to 1 (c), the anticorrosion core 10 is used for anticorrosion for the perforated portion 2 formed by perforating the tube wall of the fluid pipe 1 (see FIG. 2) as described later. The core has a body portion 14 provided with a corrosion preventing member 12 that abuts over the inner peripheral surface of the perforated portion 2, and a distal end portion 13 projecting inward of the fluid pipe. The distal end portion 13 is perforated. A tapered surface 17 is provided which gradually increases in diameter from the tip edge having a diameter smaller than that of the portion 2 toward the anticorrosion member 12 toward the anticorrosion member 12. Further, the body portion 14 is provided with a thin portion 20 which is thinner than the body portion 14, and the thin portion 20 extends over at least a part of the body portion 14 and an end portion of the distal end portion 13 in the insertion direction. The anticorrosion core 10 is formed in a concave shape on the inner peripheral surface. The thin portion 20 is preferably formed so that the thickness thereof is 1/3 to 2/3 of the thickness of the rear end side of the body portion 14.

  On the rear end side of the body portion 14, a rear end portion 18 having a diameter sufficiently larger than that of the perforated portion 2 is extended, and the anticorrosion member 12 is disposed between the rear end portion 18 and the flange portion 15. As a result, the excessive insertion in the insertion direction is restricted.

  The above-described front end portion 13, the body portion 14, and the rear end portion 18 are integrally formed, and are formed of a resin such as polypropylene, polycarbonate, polyacetal, or urethane resin, or a metal such as stainless steel.

  The anticorrosion member 12 is made of, for example, a relatively soft resin material such as a styrene thermoplastic elastomer, and the outer peripheral surface of the body portion 14 made of a material that is the same kind or different from the resin material and harder than the anticorrosion member 12. Further, it is bonded by an adhesive member (not shown), and has a larger diameter and elasticity than the perforated part 2 in its natural state, and is more easily elastically deformed than the body part 14. The anticorrosion member 12 is not limited to a styrene thermoplastic elastomer, but a soft resin such as soft vinyl chloride, styrene and olefin, engineering plastic, butyl rubber, natural rubber, urethane rubber, nitrile rubber, styrene butadiene rubber, ethylene propylene rubber, etc. These may be formed of an elastic material, putty, epoxy resin, or other adhesive. Furthermore, the anticorrosion member 12 may be thermally welded to the outer peripheral surface of the trunk | drum 14, for example, without using the above-mentioned adhesive member.

  The distal end portion 13 is formed in a curved shape so as to follow the curved surface shape of the perforated portion 2 formed in the fluid pipe 1 to be described later, and the perforated portion from the distal end edge having a smaller diameter than the perforated portion 2 toward the anticorrosion member 12 side. 2 are provided with tapered surfaces 17a, 17b, 17c and 17d which are formed in a gradually larger diameter in a natural state than 2.

  As shown in FIGS. 1A and 1B, the center O ′ of the arc R ′ formed by the end portion in the insertion direction of the tip end portion 13 is more than the center O of the arc R formed by the outer peripheral edge 15 a of the flange portion 15. Since it is close to the anticorrosion core 10, the taper angles of the tapered surfaces 17a, 17b, 17c and 17d of the tip portions 13a, 13b, 13c and 13d on each side of the anticorrosion core 10 are all around the tip portions 13a, 13b, 13c and 13d. They are formed at substantially the same angle. The taper angle of the taper surfaces 17a, 17b, 17c and 17d described above is an angle formed between each taper surface 17a, 17b, 17c or 17d and a virtual surface including the central axis C in the insertion direction of the anticorrosion core 10. Means.

  Next, the insertion of the anticorrosion core 10 into the perforated portion 2 will be described. First, as shown in FIG. 5, the perforation of the fluid pipe 1 will be described. After the cover 11 is attached to the fluid pipe 1, the perforation device 50 is sealed against the casing 35 connected to the flange 11 a of the cover 11. It arranges in. The perforating apparatus 50 is connected to a driving means (not shown) and extends in the housing 35 toward the fluid pipe 1 in the axial direction and rotates around the axis, and a fluid pipe fixed to the tip of the shaft member 51. In this embodiment, the cutter member 52 is perforated by approaching the outer surface of the fluid pipe 1 in a substantially horizontal direction, and a perforated portion is formed in the pipe wall of the fluid pipe 1. 2 is drilled. On the inner peripheral surface 2 a of the perforated part 2, the base material of the metal material constituting the fluid pipe 1 is exposed. At the time of drilling, the shaft member 51 extending in the axial direction is slightly bent due to the weight of the cutter member 52 at the tip, so that the drilling angle and the drilling position are slightly deviated from the design values (deviation α). .

  As shown in FIG. 2 (a), the anticorrosion core 10 is attached to the perforated part 2 by an attachment jig 60. As described above, the perforated part 2 has a perforation angle and a perforation position that are lower than the design values. Since the anticorrosion core 10 which is shifted downward and is lighter than the cutter member 52 described above is introduced toward the drilling position as designed, the tip portion 13a above the anticorrosion core 10 is the peripheral portion of the punching portion 2. The upper part 2b of the head is in contact with a position higher than the design position.

  As shown in FIG. 2 (b), the jig 60 is further fed toward the perforated part 2 in the above-described state, whereby the upper tip part 13 a is guided to the upper part 2 b of the peripheral part of the perforated part 2 to prevent corrosion. The core 10 is inserted while being inclined downward.

  Further, the end surface 12a of the anticorrosion member is reduced in diameter by a relatively flexible elastic deformation of the portion where the thin portion 20 is formed in the tip portion 13 and the body portion 14 toward the inner diameter direction of the perforated portion 2, The lower part 2c of the peripheral part of the perforated part 2 is overcome. Subsequently, the rear end 18 is fitted and inserted until it comes into contact with the peripheral edge of the perforated part 2, and the attachment of the anticorrosion core 10 to the perforated part 2 is completed. The protruding length in the direction of the central axis C of the tip 13 protruding inward of the fluid pipe 1 influences the influence on the fluid in the fluid pipe 1 and the washing pipe pig passing through the fluid pipe 1 as much as possible. In order to suppress it, it is desirable that it is within 5.5 mm from the fluid pipe inner surface 1a. Furthermore, the maximum outer diameter on the body portion 14 side of the distal end portion 13a having the tapered surfaces 17a, 17b, 17c and 17d can be reliably locked to the perforated portion 2 of the fluid pipe 1 and can be reduced in diameter. It is desirable that the diameter is larger than 2 mm from the opening diameter of the perforated part 2 so that it can be elastically deformed.

  Thus, the anticorrosion core 10 of the present invention is an anticorrosion core that is inserted to prevent corrosion of the perforated part 2 formed by perforating the tube wall of the fluid pipe 1, and abuts over the inner peripheral surface of the perforated part 2. It has a body portion 14 provided with an anticorrosion member 12 and a tip portion 13 protruding inward of the fluid pipe, and the tip portion 13 is drilled from the tip edge having a smaller diameter than the drilling portion 2 toward the anticorrosion member 12 side. The thin portion 20 having a tapered surface 17a formed in a natural state with a gradually larger diameter than the portion 2 and being thinner than the rear end side of the body portion 14 is formed at the distal end side of the body portion 14 and the distal end edge of the distal end portion 13. It is formed over and over. According to this, when the anticorrosion core 10 is inserted and inserted, the end surface 12 a of the anticorrosion member 12 is bent toward the inner diameter direction of the perforated portion 2, where the tip portion 13 and the thin portion 20 of the trunk portion 14 are formed. As a result, it is possible to get over the peripheral edge of the perforated part 2, so that the end surface 12 a of the anticorrosion member 12 can be prevented from being caught on the peripheral part of the perforated part 2. For this reason, even when the drilling angle or the drilling position is shifted, the anticorrosion member 102 can be reliably brought into contact with the inner peripheral surface of the drilling part, and a sufficient anticorrosion effect can be exhibited. .

  In addition, the thin portion 20 is formed in a concave shape on the inner peripheral surface of the anticorrosion core 10, and the thin portion can be formed without the need to modify the outer peripheral surface of the anticorrosion core at the time of design, so that the design is easy. is there.

  Further, the center O ′ of the arc R ′ formed by the end portion 13 of the distal end portion 13 of the anticorrosion core 10 is closer to the anticorrosion core 10 than the center O of the arc R formed by the outer peripheral edge 15a of the flange portion 15, Since the taper angles of the taper surfaces 17a, 17b, 17c and 17d of the tip portions 13a, 13b, 13c and 13d are formed at substantially the same angle over the entire circumference of the tip portions 13a, 13b, 13c and 13d, the taper. Even if any circumferential position of the surfaces 17a, 17b, 17c and 17d contacts the perforated portion 2, the load applied to the tip portions 13a, 13b, 13c and 13d can be distributed in the circumferential direction without local concentration, and uniform. In such a manner, the diameter can be reduced by elastic deformation.

  Furthermore, the center O ′ of the arc R ′ formed by the end of the anticorrosion core 10 in the insertion direction is closer to the anticorrosion core 10 than the center O of the arc R formed by the outer peripheral edge 15a of the flange 15, and each side Since the tapered surfaces 17a, 17b, 17c and 17d of the tip portions 13a, 13b, 13c and 13d can be formed long, it is possible to increase the length in which the tapered surfaces 17a, 17b, 17c and 17d are in sliding contact with the perforated portion 2. It is possible to reduce the load applied suddenly during sliding contact.

  Further, since the thin portion 20 is formed up to the disposition position of the anticorrosion member 12 in the body portion 14, at least the end surface 12 a of the anticorrosion member 12 bends in the inner diameter direction of the perforation portion 2. It can prevent catching.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, as a modified example of the present invention, as shown in FIGS. 3A to 3C, the center Q of the arc formed by the end portion 13 ′ of the tip portion 13 ′ of the anticorrosion core 10 ′ and the outside of the flange portion 15 By making the center Q ′ of the arc formed by the peripheral edge 15a concentric, the taper angles of the tapered surfaces 17c ′ and 17d ′ of the tip portions 13c ′ and 13d ′ on both sides in the tube axis direction are You may form smaller than the taper angle of taper surface 17a ', 17b' of front-end | tip part 13a ', 13b'. According to this, even if the piercing angle or the piercing position is shifted in the piercing portion 2 when viewed in the tube axis direction, the tapered surfaces 17c ′ and 17d of the tip portions 13c ′ and 13d ′ on both sides in the tube axis direction are obtained. Since the taper angle of 'is relatively small, the taper surfaces 17c', 17d 'are slidably brought into sliding contact with the perforated portion 2, and the displacement is gradually corrected without applying a large load to the sliding contact portion. can do.

  Further, for example, the taper angles of the tapered surfaces 17a and 17b of the both end portions 13a and 13b when viewed in the tube axis direction are formed smaller than the taper angles of the tapered surfaces 17c and 17d of the tip portions 13c and 13d on both sides of the tube axis direction. In this case, when there is a shift in the drilling angle and the drilling position in the vertical direction of the drilling portion 2 when viewed in the tube axis direction, the drilled portions of the tip portions 13a and 13b on both sides when viewed in the tube axis direction. Since the amount of bending in the inner diameter direction of 2 can be increased, the anticorrosion core 10 can be easily inserted.

  In addition, for example, the thin portion 20 of the present embodiment is provided on the inner peripheral surface of the anticorrosion core 10, but the thin portion of the present invention is, for example, instead of or in addition to the inner peripheral surface of the anticorrosion core, It may be provided on the outer peripheral surface. Further, for example, the thin portion 20 of the present embodiment is formed so as to span the tip edge of the tip portion 13 of the anticorrosion core 10 and the tip side of the trunk portion 14, but the thin portion of the present invention is, for example, the anticorrosion core. It may be formed over the axial direction or may be scattered at a plurality of locations.

  In addition, when the fluid pipe 1 is drilled, various shifts α can be considered due to various causes such as a drilling angle and a drilling position. However, the anticorrosion core 10 of the present invention has a thin portion 20 at the distal end portion 13 and the trunk portion 14. Since the portion where the hole is formed is elastically deformed and reduced in diameter, it is in a mode of overcoming the lower part 2c of the peripheral portion of the perforated part 2, so that it corresponds to the perforated part 2 in which various deviations α occur, and is surely anticorrosive. The member 102 can be brought into contact with the inner peripheral surface of the perforated part.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 2 Perforated part 2a Inner peripheral surface 2b of perforated part Upper part 2c of peripheral part of perforated part Lower part 10,10 ', 100 of peripheral part of perforated part Corrosion-proof core 12,12', 102 Anticorrosive member 12a, 102a Anticorrosive member End surfaces 13, 13 ′, 103 Tip portions 13 a, 13 a ′ Tip portions 13 b, 13 b ′ in the tube axis direction upper tip portions 13 c, 13 c ′ Tube axis direction tip portions 13 d, 13 d ′ Front end portion 14, 14 ', 104 Body portion 15 Ridge portion 15a Peripheral peripheral edges 17a to 17d Tapered surfaces 17a' to 17d 'Tapered surfaces 18, 18', 105 Rear end portions 20, 20 'Thin portion 35 Housing Body 52 Cutter member 60 Jig

Claims (4)

An anticorrosion core that is externally fitted and inserted into a jig in order to prevent corrosion of a perforated portion formed by perforating a tube wall of a metal fluid pipe,
A body portion provided with a corrosion preventing member that contacts the inner peripheral surface of the perforated portion; and a distal end portion projecting inward of the fluid pipe, wherein the distal end portion has a distal end edge having a smaller diameter than the perforated portion. A thin-walled portion having a tapered surface gradually expanding to a larger diameter than the perforated portion toward the anticorrosion member, and having an inner peripheral surface larger in diameter than the inner peripheral surface on the rear end side of the trunk portion, An anticorrosion core, wherein the anticorrosion core is formed so as to span between a distal end side of the trunk portion and a distal end edge of the distal end portion. The anticorrosion core according to claim 1, wherein the taper angle of the tapered surface of the tip portion is formed at substantially the same angle over the entire circumference of the tip portion. Taper angle of the tapered surface of the tip portions on both sides in the tube axis direction, according to claim 1, characterized in that it is formed smaller than the taper angle of the tapered surfaces on both sides of the front end portion in the tube axis direction as viewed Anticorrosion core. The anticorrosion core according to any one of claims 1 to 3 , wherein the thin portion is formed up to an arrangement position of the anticorrosion member in the trunk portion.

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