JP6177518B2 - Rust prevention apparatus and method - Google Patents

Description

  The present invention comprises a rust preventive member mounted along the inner peripheral surface of a branch pipe branched from a fluid pipe, and a positioning member for positioning the rust preventive member on the inner peripheral surface of the branch pipe. The present invention relates to a rust prevention apparatus and method for preventing rust.

  As a conventional anticorrosive means for a branch pipe, an uneven portion is provided at a connection portion formed by the branch pipe, a rust preventive member is disposed at the connection portion, and the antirust member is positioned by engaging with the uneven portion. (For example, refer to Patent Document 1; hereinafter referred to as “Prior Art 1”).

  In addition, as a rust preventive means for a conventional branch pipe, a flange portion bulging in the outer diameter direction is provided on the rust preventive member, and a positioning member is disposed on the flange portion provided at the end where the branch pipe faces the fluid pipe. What is known to restrict the movement of the rust preventive member to the fluid pipe side by engaging the flange portion of the rust preventive member with the restricting portion bulging in the inner diameter direction of the positioning member (for example, See Patent Document 2. Hereinafter, referred to as “Prior Art 2”).

JP 2008-267507 A (Page 9, FIG. 9) Japanese Patent Laying-Open No. 2011-163464 (page 7, FIG. 10)

  However, in the prior art 1, after disposing the rust preventive member in the connection portion, the rust preventive member is engaged with the concavo-convex portion by pressing the rust preventive member in the diameter-expanding direction so as to bulge and deform. In addition to requiring pressing means for bulging deformation, there is a problem that it takes time and labor to position and mount the rust preventive member.

  Further, in the prior art 2, the engagement between the restricting portion of the positioning member and the flange portion of the rust preventing member only restricts the movement of the rust preventing member to the fluid pipe side, and to the anti-fluid pipe side. There is a problem that it is necessary to take a separate measure to regulate the movement of the robot.

  The present invention has been made paying attention to such problems, and the positioning of the rust preventive member is easy, and at the same time, the movement of the rust preventive member to the fluid pipe side and the anti-fluid pipe side is made with simple means. An object of the present invention is to provide a rust preventive apparatus and method that can be regulated.

In order to solve the above problems, the rust preventive device of the present invention is:
A rust preventive device for rusting an inner peripheral surface of a branch pipe branched from a fluid pipe, the rust preventive core mounted along the inner peripheral face of the branch pipe, and the rust preventive core on the inner peripheral face A positioning flange and a fixing means for preventing movement of the branch pipe in the pipe axis direction of the branch pipe, and the anti-corrosion core is disposed on the anti-fluid pipe side of the branch pipe in the pipe axis direction. The base portion has a flange portion that bulges in the outer diameter direction, and the fitting flange is disposed on a flange portion at an end portion of the branch pipe, has a restriction portion that engages with the flange portion, and is fixed The means is provided on the outer peripheral surface of the flange portion so as to prevent the rust prevention core from moving toward the fluid tube side and moving toward the anti-fluid tube side using the flange portion on the anti-fluid tube side. recess provided, and, characterized in that consists of fitting member to be fitted from the outer diameter direction to the concave portion is attached to the mating flange It is.
According to this feature, it is possible to provide a rust prevention device that can easily position the rust prevention core and at the same time prevent the rust prevention core from moving to the fluid pipe side and the anti-fluid pipe side by simple means. Further, it is possible to reliably prevent the rust-proof core from moving to the fluid pipe side and the anti-fluid pipe side by operating the fitting member.

The rust preventive device of the present invention is
The rust-proof core has a diameter-expanded portion that is expanded toward a branch port portion that branches from the fluid pipe to the branch pipe.
According to this feature, it is possible to suppress the intrusion of the fluid flowing in the fluid pipe between the outer surface of the rust prevention core and the inner surface of the branch pipe, and it is possible to suppress the growth of rust humps on the inner face of the branch pipe. Moreover, the movement of the anticorrosive core to the anti-fluid tube side can be prevented.

The rust preventive device of the present invention is
The fitting flange is fixed to the flange portion at the end of the branch pipe after being centered using a centering pin that fits into the bolt hole with respect to the flange portion at the end of the branch pipe. It is characterized by.
According to this feature, the rust-proof core can be accurately arranged on the inner surface of the branch pipe.

The rust prevention method of the present invention is
A rust prevention method for preventing rusting of an inner peripheral surface of a branch pipe branched from a fluid pipe in an uninterrupted state, wherein a joint flange for positioning a rust preventive core on the inner peripheral surface after closing the branch pipe is provided in the branch pipe. Centering is performed using a centering pin with respect to the flange portion at the end of the tube, and then the anticorrosive core is inserted into the inner peripheral surface and disposed on the anti-fluid tube side of the branch tube in the tube axis direction. The flange portion provided at the base portion of the rust prevention core is brought into contact with the restriction portion of the joint flange so as to position the branch pipe in the tube axis direction, and then the recess portion provided on the outer peripheral surface of the flange portion. And the fluid of the anticorrosive core using the flange on the anti-fluid pipe side by a fixing means configured to be fitted to the fitting flange and fitted into the recess from the outer diameter direction. It is characterized by preventing movement to the pipe side and movement to the anti-fluid pipe side.
According to this feature, it is easy to position the rust-proof core, and at the same time, the rust-proof core can be accurately arranged on the inner surface of the branch pipe, and the rust-proof core is directed to the fluid pipe side and the anti-fluid pipe side. The movement can be surely prevented. Further, it is possible to reliably prevent the rust-proof core from moving to the fluid pipe side and the anti-fluid pipe side by operating the fitting member.

It is a longitudinal cross-sectional view which shows the branch pipe to which the air valve and the repair valve were attached. It is a longitudinal cross-sectional view which shows the state by which the sweeper tool was attached to the branch pipe. (A) is the longitudinal cross-sectional view which shows the state which obstruct | occluded the branch pipe with the top insertion tool, and attached the newly installed repair valve and the joint flange, (b) is AA sectional drawing of (a). (C) is a perspective view of a centering pin. (A) is a longitudinal cross-sectional view which shows the state which attached the antirust core insertion tool which equipped the antirust core which concerns on Example 1 to the newly installed repair valve, (b) is an enlarged view of an antirust core. . It is a longitudinal cross-sectional view which shows the state by which the antirust core which concerns on Example 1 was inserted in the predetermined position. It is a longitudinal cross-sectional view which shows the state with which the antirust core which concerns on Example 1 was mounted | worn. It is a longitudinal cross-sectional view which shows the state with which the rustproof core which concerns on Example 2 was mounted | worn. It is a longitudinal cross-sectional view which shows the state with which the antirust core which concerns on Example 3 was mounted | worn.

  EMBODIMENT OF THE INVENTION The form for implementing the rust prevention apparatus which concerns on this invention, and its method is demonstrated below based on an Example.

  The rust prevention apparatus and method according to the first embodiment will be described with reference to FIGS. In the following description, it is assumed that fluid pipes are disposed in the left-right direction of FIG. 1 to FIG. 6 and that branch pipes are connected to the upper side perpendicular to the fluid pipes.

  As shown in FIG. 1, for example, an air valve 4 is provided at a predetermined position in the longitudinal direction of an existing fluid pipe 1 in order to discharge the air in the fluid pipe 1 to the outside of the pipe or to take air into the pipe. Is provided. The air valve 4 is attached to the fluid pipe 1 via a branch pipe 2 branched from the fluid pipe 1 and a repair valve 3 connected to the branch pipe 2. Further, the branch pipe 2 and the repair valve 3 are connected by fastening bolts 7 and nuts 8 inserted into the flange part 5 of the branch pipe 2 and the lower flange part 6 of the repair valve 3.

  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 covered with a mortar layer. The fluid pipe according to the present invention may be made of metal such as cast iron and steel. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. In this embodiment, the fluid in the fluid pipe is clean water, but is not limited to clean water in this embodiment. For example, in addition to industrial water, agricultural water, sewage, etc., gas or gas-liquid mixture of gas and liquid It does not matter.

  The repair valve 3 is normally open and communicates with the fluid pipe 1 and the air valve 4 so that air can flow through the air valve 4 and is closed when the air valve 4 is repaired or replaced. As a state, the air valve 4 can be detached.

  The inner peripheral surface of the branch pipe 2 is easily corroded because air flows and the fluid in the pipe tends to stay, and the rust hump 9 may grow on the inner surface due to long-term use and may not serve as a branch pipe. In such a case, the rust hump 9 on the inner peripheral surface of the branch pipe 2 is removed, and a rust preventive member called a rust preventive core is attached to prevent the inner peripheral surface of the branch pipe 2 from being rusted. .

  Hereinafter, the process of removing the rust hump 9 on the inner peripheral surface of the branch pipe 2 and performing rust prevention on the inner peripheral surface of the branch pipe 2 in an uninterrupted flow using a rust preventive device will be described in order.

  As shown in FIG. 2, first, with the existing repair valve 3 closed, the air valve 4 is removed, and the sweeper tool 11 is attached to the upper flange 10 of the repair valve 3. Next, the repair valve 3 is opened, the sweeper jig 13 attached to the tip of the shaft 12 is inserted to the vicinity of the rust hump 9, and the sweep jig 13 is rotated by the handle 14 to remove the rust hump 9. After the rust hump 9 is removed, the sweeper jig 13 is lifted upward and the repair valve 3 is closed.

  When the repair valve 3 itself becomes defective due to failure or the like, the detaching device 50 having a slide plate as shown by a two-dot chain line in FIG. 2 is connected to the flange portion 5 of the branch pipe 2 and the lower flange of the repair valve 3. The air valve 4 may be attached to or detached from the portion 6.

  The detaching apparatus 50 is mainly attached in a sealed manner so that a gap can be formed between the opposed surfaces of the pair of flange portions 5 and 6, and an attachment member 52 for accommodating a valve body 51 made of a slide plate, and a flange accommodation It replaces with the part 53 and the existing volt | bolt 7, and has the leak prevention member (not shown) etc. which seal an insertion hole.

  In order to remove the air valve 4 using the desorption device 50, the valve body 51 is moved in the gap between the pair of flange portions 5 and 6 to the predetermined position where the branch pipe 2 is closed by moving in the center direction of the flange portion. In this state, the clearance around the valve body 51 is eliminated, and after the sealing, the air valve 4 is removed, and a necessary tool is attached to the flange portion 5 at the upper part of the branch pipe 2.

  In any of the above cases, after the sweeper jig 13 is pulled upward and the repair valve 3 is closed, the sweeper tool 11 is removed, and the top insertion tool 17 is attached, as shown in FIG. The rack 15 is inserted and expanded to the inner peripheral surface of the branch pipe 2, and the existing repair valve 3 is removed. Next, the flange portion 18 of the branch pipe 2 and the flange portion 18 of the newly installed repair valve 25 are overlapped with the flange portion 5 and fixed with bolts 19 and nuts 20 (see FIG. 4). Use to fix after centering. As shown in FIG. 3B, for example, the centering operation is performed by inserting the centering pins 21 into two diagonal positions of the four bolt holes 22 and then inserting bolts into the remaining two bolt holes 22 in this state. 19 and the nut 20 are inserted and fixed, and then the centering pin 21 is replaced with the bolt 19 and the nut 20.

  Reference numeral 24 denotes a support attached to the branch pipe 2, and the support 15 is moved by the insertion arm 38 and the shaft 26 of the support insertion tool 17 using this support 24. Description is omitted.

  As shown in FIG. 3 (c), the centering pin 21 is elastic in the radial direction so as to follow the bolt hole 22, and is formed of a spring material that can be elastically deformed, and is provided at one place in the circumferential direction. And the diameter in the free state is larger than that of the bolt hole 22. Further, both ends 21 ′ of the centering pin 21 are tapered so as to be easily fitted into the bolt holes 22.

  Since the branch pipe 2, the joint flange 16, and the newly installed repair valve 25 are more precisely centered by using the centering pin 21, it is possible to accurately attach the anticorrosive core described later to the branch pipe 2.

  The positioning flange 16 in this embodiment is an annular member having an inner diameter slightly smaller than the inner diameter of the branch pipe 2, and has a restricting portion 16a that bulges in the reduced diameter direction at the lower end portion of the inner peripheral surface. In addition, a flange portion of a rust preventive core, which will be described later, comes into contact with the restricting portion 16a and is positioned.

  In addition, packings 23 as sealing members are disposed on both the upper and lower surfaces of the joint flange 16, and fluid tightness on the upper and lower surfaces of the joint flange 16 is ensured.

  When the fitting flange 16 and the newly installed repair valve 25 have been attached to the flange portion 5 of the branch pipe 2, the top insertion tool 17 is removed, and as shown in FIG. The rust preventive core insertion tool 27 to which the rust preventive core 30 is attached is attached.

  Here, the rust prevention core 30 will be described. The rust prevention core 30 has a cylindrical shape as shown in FIG. 4B, and the length of the branch pipe 2 is such that the inner peripheral surface of the branch pipe 2 can be covered. The base 30a is provided with a flange 30b that is slightly longer than the base 30a and bulges in the outer diameter direction. Moreover, the recessed part 30c which is a fixing means of this invention is formed in the outer peripheral surface of the collar part 30b. The recess 30c is formed, for example, by performing V groove processing on the entire circumference. The step portion 30d of the flange portion 30b is in contact with the upper surface of the restriction portion 16a of the joint flange 16 and plays a role of positioning the rust prevention core 30 in the tube axis direction with respect to the branch pipe 2. Further, the outer diameter of the cylindrical portion 30e of the rust prevention core 30 is set smaller than the inner diameter of the branch pipe 2, and there is a gap between them. The rust prevention core 30 is formed from a corrosion-resistant material, for example, a stainless material.

  Further, as shown in FIG. 4 (a), the fixing flange 16 of the present invention for fixing the anticorrosive core 30 such as a set screw and a taper screw sinking plug, which will be described later, is attached to the joint flange 16 in the radial direction. A female screw hole 35 penetrating therethrough is provided. The female screw holes 35 are formed at, for example, two locations facing each other in the circumferential direction. The female screw hole 35 is provided at a position facing the recess 30c formed in the flange 30b of the rust prevention core 30 in a state where the rust prevention core 30 is inserted at a predetermined position.

  Next, the nut 28 on the upper side of the support column 24 is removed, the insertion arm 29 is gripped, and the rust-proof core insertion tool 27 is pushed down by hand, and the hole 31 of the insertion arm 29 is inserted into the support column 24 as shown in FIG. In this manner, the tip of the rust prevention core 30 is inserted up to the upper surface of the joint flange 16. Thereafter, the insertion arm 29 is fixed to the support column 24 by the nut 28. Next, a tool such as a ratchet wrench (not shown) is attached to the nut 28 and the nut 28 is rotated, and the insertion arm 29 is pushed down until the stepped portion 30d of the rust prevention core 30 contacts the upper surface of the restricting portion 16a of the mating flange 16. . When the stepped portion 30d of the rust-proof core 30 abuts against the upper surface of the restricting portion 16a of the joint flange 16, the force to push down the insertion arm 29 is doubled, so that it can be seen that the rust-proof core 30 has been inserted to a predetermined position. In particular, as shown by the dotted line encircled portion in FIG. 5, the stepped portion 30 d of the rust prevention core 30 has a tapered surface that abuts the upper surface that is the inclined surface of the restricting portion 16 a of the joint flange 16. The rust prevention core 30 can be centered by pressing the tapered surface of the portion 30d against the inclined surface of the restricting portion 16a.

  When the rust-proof core 30 is inserted to a predetermined position, as shown in a partially enlarged view of FIG. 5, a set screw 36 screwed in advance is further screwed into the female screw hole 35 of the joint flange 16, and the set screw 36. The taper screw sinking plug 37 is screwed in from behind. The tip of the set screw 36 has, for example, an acute-angled pointed shape. The tip of the pointed shape fits into the recess 30c formed in the flange portion 30b of the rust-proof core 30, and the set screw 36 is simply turned. The movement of the anticorrosion core 30 to the fluid pipe 1 side and the anti-fluid pipe side can be surely prevented by a simple operation.

  When the positioning and fixing of the rust-proof core 30 is completed, the rust-proof core insertion tool 27 is pulled up, the newly installed repair valve 25 is closed, the rust-proof core insertion tool 27 and the column 24 are removed, and the new rust-proof core insertion tool 27 is installed as shown in FIG. The work is completed by attaching the air valve 4 to the repair valve 25.

  When replacing the rust-proof core 30, the rust-proof core 30 is replaced by a procedure reverse to the above-described work procedure.

  Next, a rust prevention apparatus according to Example 2 will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the same structure as the said Example 1, and the overlapping description is abbreviate | omitted. The rust preventive device according to the second embodiment is different from the rust preventive device according to the first embodiment in the fixing means of the rust preventive core, but the other configurations are the same.

  In the rust preventive apparatus according to the second embodiment, the fixing means of the rust preventive core 30 ′ is a stepped portion 30 ′ of the flange portion 30 ′ b that abuts the surface on the side opposite to the fluid pipe of the restricting portion 16 ′ a of the joint flange 16 ′. d, and a stopper 40 that is elastically deformable in the radial direction and abuts against the surface of the restricting portion 16′a on the fluid pipe side. The restriction portion 16'a of the joint flange 16 'is the same as the restriction portion 16a of the joint flange 16 of the first embodiment, and detailed description thereof is omitted. Further, the mating flange 16 ′ is not provided with a female screw hole for mounting a set screw and a taper screw sinking plug like the mating flange 16 of the first embodiment, and further, the flange portion 30′b of the rust prevention core 30 ′. Is not provided with a recess like the collar portion of the first embodiment.

  The rust prevention core 30 ′ is provided with a stopper 40 spaced from the stepped portion 30 ′ d on the fluid pipe side by an amount corresponding to the thickness of the restricting portion 16 ′ a. The stopper 40 is formed of, for example, a tapered cylindrical member made of a leaf spring material or the like, the inner diameter of the small diameter portion 40a is substantially the same as the outer diameter of the cylindrical portion 30e, and the inner diameter of the large diameter portion 40b is the restriction portion. 16'a is set larger than the inner diameter, and the end portion of the large-diameter portion 40b is set to be separated from the stepped portion 30'd toward the fluid pipe 1 by an amount corresponding to the thickness of the restricting portion 16'a. In the small diameter part 40a, it fixes to the outer peripheral surface of the cylindrical part 30e by means, such as welding. In order to facilitate the elastic deformation of the large-diameter portion 40b in the radial direction, for example, the stopper may be provided with a slit in the circumferential direction, or the stopper is not necessarily limited to the cylindrical member, and the large-diameter portion described above. A plurality of plate-like members having end portions similar to 40b may be fixed to the cylindrical portion 30e in the circumferential direction.

  In mounting the rust-proof core 30 ′, the rust-proof core 30 ′ is inserted into the branch pipe 2 until the stepped portion 30 ′ d of the rust-proof core 30 ′ comes into contact with the upper surface of the restricting portion 16 ′ a of the joint flange 16 ′. However, when the large-diameter portion 40b of the stopper 40 passes through the restricting portion 16'a, the diameter is reduced and passes through the restricting portion 16'a, and the stepped portion 30'd contacts the upper surface of the restricting portion 16'a. At that time, the diameter is expanded by the elastic recovery force. In this state, the large-diameter portion 40b has a diameter larger than the inner diameter of the restricting portion 16'a and abuts on the surface of the restricting portion 16'a on the fluid pipe side.

  In this way, the stopper 40 is expanded in diameter simply by inserting the rust prevention core 30 'into a predetermined position and comes into contact with the surface of the restricting portion 16'a on the fluid pipe side, so that the rust prevention core is not required to perform any special operation. Positioning of 30 'and movement to the fluid pipe side and the anti-fluid pipe side can be prevented.

  In addition, when replacing the rust preventive core 30 ', the procedure is the reverse of the procedure for mounting the rust preventive core 30'. At that time, the stopper 40 may be plastically deformed.

  Next, a rust prevention apparatus according to Example 3 will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the same structure as the said Example 1, and the overlapping description is abbreviate | omitted. The rust preventive device according to the third embodiment is different from the rust preventive device according to the first embodiment in the tip shape of the rust preventive core, but the other configurations are the same.

  In the rust prevention device according to the third embodiment, the rust prevention core 30 has a diameter-enlarged portion 30f that is expanded toward the branch port portion 2 'that branches from the fluid pipe 1 to the branch pipe 2. For example, when the rust preventive core 30 is fixed in a predetermined position and then the extension means is inserted into the rust preventive core 30 to expand the tip of the rust preventive core 30, the end portion of the enlarged diameter portion 30 f becomes a branch port portion. It is plastically deformed until it abuts against the inner surface of 2 ′ and is brought into a state of abutting against the inner surface of the branch port 2 ′, and the diameter is expanded to the shape shown in FIG.

  In the rust prevention device according to the third embodiment, the intrusion of the fluid flowing in the fluid pipe 1 can be suppressed between the outer surface of the rust prevention core 30 and the inner surface of the branch pipe 2, and the rust hump on the inner face of the branch pipe 2. Growth can be suppressed. Moreover, the movement of the rust preventive core 30 to the anti-fluid tube side can be prevented. Further, even if the rust hump may be peeled off from the inner surface of the branch pipe 2, it is possible to prevent the rust hump from being captured by the enlarged diameter portion 30f and mixed into the fluid pipe 1.

  As described above, the rust prevention device of the present invention is a rust prevention device that rusts the inner peripheral surface of the branch pipe 2 branched from the fluid pipe 1, and is mounted along the inner peripheral surface of the branch pipe 2. A rust prevention core 30, a flange 16 for positioning the rust prevention core 30 on the inner peripheral surface, and fixing means 36, 37, 40 for preventing the rust prevention core 30 from moving in the tube axis direction. The rust core 30 has a flange portion 30b that bulges in the outer diameter direction at the base portion 30a, and the joint flange 16 is disposed on the flange portion at the end of the branch pipe 2 and engages with the flange portion 30b. 16a, 16'a, and the fixing means 36, 37, 40 are configured to prevent the rust prevention core 30 from moving to the fluid pipe side and the anti-fluid pipe side using the flange 30b. The positioning of the rust prevention core 30 is easy, and at the same time, the movement of the rust prevention core 30 to the fluid pipe side and the anti-fluid pipe side is simplified. It is possible to provide a rust device capable of preventing in a unit.

  Further, the rust prevention method of the present invention is a rust prevention method for preventing rust in an undisturbed state on the inner peripheral surface of the branch pipe 2 branched from the fluid pipe 1, and after the branch pipe 2 is closed, the rust prevention core 30 is attached. Centering is performed using the centering pin 21 with respect to the flange portion 5 at the end of the branch pipe 2, and the anti-corrosion core 30 is inserted into the inner peripheral surface. The flange portion 30b provided on the base portion 30a of the rust prevention core 30 is brought into contact with the restricting portions 16a and 16'a of the joint flanges 16 and 16 to perform positioning in the tube axis direction, and thereafter, by fixing means 36, 37 and 40 In order to prevent the rust-proof core 30 from moving to the fluid pipe side and the anti-fluid pipe side, the rust-proof core 30 is easily positioned, and at the same time, the rust-proof core 30 is disposed on the inner surface of the branch pipe 2 with high accuracy. It is possible to reliably prevent the rust prevention core 30 from moving to the fluid pipe side and the anti-fluid pipe side. It can be.

  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, in the above-described embodiment, the existing fluid pipe and the branch pipe branched from the fluid pipe are described, but the rust prevention apparatus and the rust prevention method of the present invention are based on the newly installed fluid pipe and the fluid pipe. Needless to say, the branched branch pipe can be applied to the target. In that case, the process of removing rust is omitted.

1 Fluid Pipe 2 Branch Pipe 2 'Branch Port 3 Repair Valve 4 Air Valve 5 Flange Part 6 Lower Flange Part 7 Bolt 8 Nut 9 Rust Hump 10 Upper Flange 11 Sweeper Tool 12 Shaft 13 Sweeper Jig 14 Handle 15 Standing Top 16 Flange 16a, 16'a Restriction part 17 Stand top insertion tool 18 Flange part 19 Bolt 20 Nut 21 Centering pin 22 Bolt hole 23 Packing 25 New repair valve 26 Shaft 27 Rust prevention core insertion tool 30 Rust prevention core 30a Base part 30b Ridge part 30c recess (fixing means)
30d, 30'd Stepped part (fixing means)
30f Expanded portion 35 Female screw hole 36 Set screw (fixing means)
37 Tapered screw sinking plug (fixing means)
40 Stopper (fixing means)
50 Desorption device

Claims (4)

A rust preventive device for rusting an inner peripheral surface of a branch pipe branched from a fluid pipe, the rust preventive core mounted along the inner peripheral face of the branch pipe, and the rust preventive core on the inner peripheral face A positioning flange and a fixing means for preventing movement of the branch pipe in the pipe axis direction of the branch pipe, and the anti-corrosion core is disposed on the anti-fluid pipe side of the branch pipe in the pipe axis direction. The base portion has a flange portion that bulges in the outer diameter direction, and the fitting flange is disposed on a flange portion at an end portion of the branch pipe and has a restricting portion that engages with the flange portion, and is fixed The means is provided on the outer peripheral surface of the flange portion so as to prevent the rust prevention core from moving toward the fluid tube side and moving toward the anti-fluid tube side using the flange portion on the anti-fluid tube side. recess provided, and, characterized in that consists of fitting member to be fitted from the outer diameter direction to the concave portion is attached to the mating flange Rust device that. The rust prevention device according to claim 1, wherein the rust prevention core has a diameter-expanded portion that is expanded toward a branch port portion that branches from the fluid pipe to the branch pipe. The fitting flange is fixed to the flange portion at the end of the branch pipe after being centered using a centering pin that fits into the bolt hole with respect to the flange portion at the end of the branch pipe. The rust preventive device according to claim 1 or 2 . A rust prevention method for preventing rusting of an inner peripheral surface of a branch pipe branched from a fluid pipe in an uninterrupted state, wherein a joint flange for positioning a rust preventive core on the inner peripheral surface after closing the branch pipe is provided in the branch pipe. Centering is performed using a centering pin with respect to the flange portion at the end of the tube, and then the anticorrosive core is inserted into the inner peripheral surface and disposed on the anti-fluid tube side of the branch tube in the tube axis direction. The flange portion provided at the base portion of the rust prevention core is brought into contact with the restriction portion of the joint flange so as to position the branch pipe in the tube axis direction, and then the recess portion provided on the outer peripheral surface of the flange portion. And the fluid of the anticorrosive core using the flange on the anti-fluid pipe side by a fixing means configured to be fitted to the fitting flange and fitted into the recess from the outer diameter direction. Rust prevention characterized by preventing movement to the pipe side and movement to the anti-fluid pipe side Law.

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