JP2012007740A - Locking body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply anticorrosion treatment advantageous in cost and construction to a specified region in a fluid pipe.SOLUTION: At each of pipe parts constituting a flow path or a connection position between the pipe parts, a protruded portion 4a protruded toward the side of the flow path, a recessed portion 4b opened toward the side of the flow path, or an uneven portion 4A including both of them is provided. In a rust preventing bush 8 inserted in a predetermined position inside a pipe in the state that part of the outer peripheral face faces the protruded portion 4a, the recessed portion 4b or the uneven portion 4A, a swollen and deformed portion 8A swollen and deformed radially outward at a site corresponding to the protruded portion 4a, the recessed portion 4b or the uneven portion 4A is engaged with the protruded portion 4a, the recessed portion 4b or the uneven portion 4A so as to be relatively non-movable in the direction of a branch shaft core X.

Description

  The present invention relates to an anticorrosion structure for fluid piping and a corrosion prevention method for fluid piping in which a rust prevention bush is mounted at a predetermined position of a pipe portion constituting a flow path or a connecting portion of the pipe portion.

  In the conventional anticorrosion structure for fluid pipes, one or more branch pipes, generally called short pipes, are formed at the end of the pipe at the connecting flange part of the branch pipe part integrally formed in the middle of the fluid pipe. The length extending from the maximum inner diameter position of the trumpet-shaped inner peripheral surface on the base end side (upstream end side) of the branch pipe portion of the fluid pipe to the opening end portion of the most downstream branch pipe. And having a rear end side (downstream end side) formed in an annular shape with an outer diameter that can be engaged with the opening end portion of the most downstream branch pipe from the branch axis direction. Insert a rust bushing, and expand and deform the distal end of this rust prevention bush along the trumpet-shaped inner peripheral surface on the base end side of the branch pipe with a bush diameter expander. It was configured to prevent movement in the direction (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 3-28973

  In the conventional anticorrosion structure for fluid piping, a trumpet-shaped inner peripheral surface on the proximal end side of the branch pipe portion where the inner diameter of the pipe gradually increases, or an inner space expanding on the inner peripheral surface side of the branch port drilled in the fluid pipe is used. Then, by expanding and deforming the tip of the rust prevention bush, the rust prevention bush is prevented from moving downstream in the branch axis direction, and the rust prevention bush is moved upstream in the branch axis direction. Is prevented by folding back the rear end side of the anticorrosion bush in an annular shape with an outer diameter that can be engaged with the opening end portion of the most downstream branch pipe from the branch axis direction.

  Therefore, as the rust-proof bushing, for example, even if it is necessary to rust-proof only a part of the branch pipe, the rust-proof bush is located at the maximum inner diameter position of the trumpet-shaped inner peripheral surface on the base end side of the branch pipe portion of the fluid pipe. A length extending to the opening end of the downstream branch pipe is required, which not only raises the cost of the rust prevention treatment, but also has a problem of receiving various restrictions on the construction of the rust prevention treatment.

  The present invention has been made in view of the above-described actual situation, and its main problem is that the anticorrosion structure and the anticorrosion method capable of advantageously performing anticorrosion treatment on the specified area in the fluid pipe in terms of cost and construction. Is to provide

  According to the first characteristic configuration of the present invention, a convex portion projecting toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions are provided at a pipe portion constituting the flow channel or a connection portion of the pipe portion. Of the anticorrosion bush inserted at a predetermined position in the pipe in a state where a part of the outer peripheral surface faces the convex portion, the concave portion or the concave and convex portion, and the diameter corresponding to the convex portion, the concave portion or the concave and convex portion. The bulging deformation part bulging and deforming outward in the direction is engaged with the convex part, the concave part or the concave and convex part so as not to be relatively movable in the tube axis direction.

  According to the above characteristic configuration, when the specified region in the fluid pipe is subjected to the anticorrosion treatment, the convex portion projecting toward the flow path side is formed at the pipe portion corresponding to a part of the anticorrosion treatment region or the connection portion of the pipe portion. A rust-proof bushing is provided in the anticorrosion treatment region at a predetermined position in the pipe in a state where a part of the outer peripheral surface faces the convex part, the concave part or the concave-convex part. In this state, when the portion of the anticorrosion bush corresponding to the convex portion, the concave portion or the concave and convex portion is bulged and deformed outward in the radial direction, the bulging deformation portion is related to the convex portion, the concave portion or the concave and convex portion. In combination, they are fixedly mounted so that they cannot move relative to each other in the tube axis direction.

  Therefore, by forming the convex portion, the concave portion or the concave-convex portion at the pipe portion or the connecting portion of the pipe portion, a rust-proof treatment region by the rust-proof bush can be freely set, so that a pipe line is configured. The rust-proof bushing can be brought close to the minimum required length, and the specified area in the fluid pipe is advantageously protected against corrosion in terms of cost and construction. can do.

  A second characteristic configuration according to the present invention is a convex portion projecting toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions between the joint surfaces of the connecting flange portions of the flange-joined pipe portions. Among the rust preventive bushes inserted in a predetermined position in the pipe in a state where a part of the outer peripheral surface faces the locking body, the locking body is provided. The bulging deformed portion bulged and deformed radially outward at a portion corresponding to is engaged with the convex portion, the concave portion or the concave and convex portion so as not to be relatively movable in the tube axis direction.

  According to the above characteristic configuration, when the specified region in the fluid pipe is subjected to the anticorrosion treatment, it projects toward the flow path side between the joint surfaces of the connecting flange portions of both pipe portions corresponding to a part of the anticorrosion treatment region. Provided with an engaging body that has a convex portion or a concave portion that opens toward the flow path side, or both concave and convex portions, or that exposes the concave portion, and a portion of the outer peripheral surface faces the engaging body. When the anticorrosion bush is inserted into the anticorrosion treatment region at a predetermined position, and the portion corresponding to the locking body of the anticorrosion bush is bulged and deformed radially outward in this state, the bulging deformation portion becomes the convex portion. Or it engages with a recessed part or an uneven | corrugated | grooved part, and it is fixedly mounted so that relative movement is impossible in a pipe-axis direction.

  In addition, since the locking body is only attached between the joint surfaces of the connecting flange portions of the two pipe portions, the convex portion, the concave portion or the concave and convex portions are integrally formed on the inner peripheral surface of the pipe portion. Thus, the operation for forming the convex portion, the concave portion or the concave-convex portion can be performed efficiently and easily.

  Accordingly, by providing a locking body provided with the convex part, the concave part or the concave part or the convex part between the joint surfaces of the connecting flange parts of the two pipe parts or exposing the concave part, a rust prevention treatment region by the rust prevention bush. Since the length of the rust-proof bushing can be brought close to the minimum required length, it is possible to specify the inside of the fluid pipe. The formed area can be advantageously subjected to anticorrosion treatment in terms of cost and construction.

  A third characteristic configuration according to the present invention is that the convex portion, the concave portion, or the concave and convex portion is formed in an annular shape that is continuous in the circumferential direction.

  According to the above characteristic configuration, when a portion corresponding to the convex portion, the concave portion, or the concave and convex portion of the anticorrosion bush is bulged and deformed outward in the radial direction, the bulging deformation portion becomes an annular convex portion, concave portion, or concave and convex portion. Since the engagement is performed on the entire circumference or substantially the entire circumference, even if there is a variation in the engagement allowance in the circumferential direction of both, it is possible to securely and firmly fix the two so that they cannot be moved relative to each other in the tube axis direction.

  The 4th characteristic structure by this invention exists in the point by which the said convex part, a recessed part, or an uneven | corrugated | grooved part is intermittently formed in the circumferential direction.

  According to the above-described characteristic configuration, when a portion corresponding to the convex portion, the concave portion, or the concave and convex portion of the anticorrosion bush is bulged and deformed outward in the radial direction, the convex portion, the concave portion, or Since it engages with the concavo-convex portion, both can be securely fixed in the tube axis direction so as not to move relative to each other, and the bulging deformation portion of the bulging deformation portion between the convex portion, the concave portion, or the circumferential end of the concavo-convex portion is secured. When a part is engaged in the state where it enters, both relative rotations can be prevented simultaneously.

  A fifth characteristic configuration according to the present invention is that the locking body is clamped and fixed between the joint surfaces of the connecting flange portions of both pipe portions via a sealing material.

  According to the above characteristic configuration, at least a part of both side surfaces of the locking body can be covered with a sealing material for sealing between the joint surfaces of the connecting flange portions of the both pipe portions. Simplification and facilitation of rust prevention treatment on both side surfaces can be achieved.

  A sixth characteristic configuration according to the present invention is that the locking body is fitted and held in a groove formed in at least one of the joint surfaces of the connecting flange portions of the two pipe portions.

  According to the above characteristic configuration, the locking body can be securely and strongly fixed by fitting and holding the locking body in a groove formed in at least one of the joint surfaces of the connecting flange portion. In addition, the distance between the joint surfaces of the two connecting flange portions can be made as small as possible.

A seventh characteristic configuration according to the present invention is that the locking body is joined to a sealing material that seals between joint surfaces of the connecting flange portions of the two pipe portions.
According to the above characteristic configuration, since the locking body and the sealing material can be handled as an integrated object, the assembly work of the locking body and the sealing material can be facilitated.

  An eighth characteristic configuration according to the present invention is that the locking body is formed in an annular shape, and the convex portion, the concave portion or the concave-convex portion is integrally formed on an inner peripheral surface thereof.

  According to the above characteristic configuration, for example, as in the case where the convex portion, the concave portion or the concave-convex portion is distributed over the inner peripheral surface of the locking body and the inner peripheral surface of the tube portion continuous thereto, There is no need to adjust the relative positional relationship between the constituent elements on the locking body side and the constituent elements on the pipe inner peripheral surface side, and the assembly work can be facilitated.

A ninth characteristic configuration according to the present invention is a corrosion prevention method for a fluid pipe in which a rust prevention bush is attached to a part of at least one inner peripheral surface of both flange-joined pipe parts,
Between the joint surfaces of the connecting flange portions of the two pipe portions, there is provided a convex portion protruding toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions, or a locking body that exposes the concave portion. Among the rust preventive bushes inserted at predetermined positions in the pipe in a state where a part of the outer peripheral surface faces the engaging body, a part of the rust preventing bush corresponding to the engaging body is a bush diameter expanding machine. The bulging deformation portion of the rust prevention bush is engaged with the convex portion, the concave portion or the concave and convex portion so as not to be relatively movable in the tube axis direction.

  According to the above characteristic configuration, when the specified region in the fluid pipe is subjected to the anticorrosion treatment, it projects toward the flow path side between the joint surfaces of the connecting flange portions of both pipe portions corresponding to a part of the anticorrosion treatment region. Provided with an engaging body that has a convex portion or a concave portion that opens toward the flow path side, or both concave and convex portions, or that exposes the concave portion, and a portion of the outer peripheral surface faces the engaging body. The anticorrosion bush is inserted into the anticorrosion treatment area at a predetermined position, and in this state, a part corresponding to the locking body of the anticorrosion bush is bulged and deformed radially outward by a bush enlarger. The protruding deformation portion engages with the convex portion, the concave portion or the concave and convex portion, and is fixedly mounted so as not to be relatively movable in the tube axis direction.

  In addition, since the locking body is only attached between the joint surfaces of the connecting flange portions of the two pipe portions, the convex portion, the concave portion or the concave and convex portions are integrally formed on the inner peripheral surface of the pipe portion. Thus, the operation for forming the convex portion, the concave portion or the concave-convex portion can be performed efficiently and easily.

  Accordingly, by providing a locking body provided with the convex part, the concave part or the concave part or the convex part between the joint surfaces of the connecting flange parts of the two pipe parts or exposing the concave part, a rust prevention treatment region by the rust prevention bush. Since the length of the rust-proof bushing can be brought close to the minimum required length, it is possible to specify the inside of the fluid pipe. The formed area can be advantageously subjected to anticorrosion treatment in terms of cost and construction.

  According to a tenth characteristic configuration of the present invention, there is provided a gap between a connecting flange portion of a branch pipe portion of a fluid pipe or a branch pipe portion of a branch joint sheathed on the fluid pipe and a connecting flange portion of a repair valve connected thereto. Or, between the connecting flange portion of the branch pipe portion and the connecting flange portion of the connecting pipe connected thereto, a convex portion protruding toward the flow channel side, a concave portion opening toward the flow channel side, or both irregularities Of the rust preventive bushing inserted into a predetermined position in the pipe in a state in which a part of the outer peripheral surface faces the locking body, the locking body is provided with a locking body provided with a portion or exposing the recess. A part of the rust prevention bush corresponding to the above is bulged and deformed outward in the radial direction by a bush enlarger, and the bulging deformation part of the rust prevention bush is in the direction of the tube axis with respect to the convex part, concave part or concave and convex part It is characterized in that it is engaged so as not to be relatively movable.

  According to the above characteristic configuration, for example, a branch pipe part of a fluid pipe or a branch pipe part of a branch joint sheathed on the fluid pipe, or a region extending to a part of a repair valve or a connection pipe that is flange-bonded thereto is anticorrosive. When processing, between the joint surfaces of both connecting flange portions corresponding to a part of the anticorrosion treatment region, a convex portion protruding toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions are provided. Alternatively, a locking body that exposes the recess is provided, and a rust-proof bushing is inserted into the anti-corrosion treatment region at a predetermined position in the pipe in a state where a part of the outer peripheral surface faces the locking body. A portion of the bush corresponding to the locking body is bulged and deformed outward in the radial direction by a bush enlarger, so that the bulging deformed portion engages with the convex portion, the concave portion or the concave and convex portion, and the tube shaft Fixedly mounted so that it cannot move relative to the core.

  In addition, since the locking body is only provided between the joint surfaces of the two connecting flange portions, this is compared with the case where the convex portion or the concave portion or the concave and convex portion are integrally formed on the inner peripheral surface of the pipe portion. The operation for forming the convex portion, the concave portion or the concave-convex portion can be easily and efficiently performed.

  Accordingly, by providing a locking body provided with the convex part, the concave part or the concave part or the convex part between the joint surfaces of the two connecting flange parts, or exposing the concave part, the rust prevention treatment region by the rust prevention bush can be freely set. Since it can be set, it is difficult to be affected by the form of the pipes constituting the pipe line, and the length of the rust prevention bush can be brought close to the minimum necessary length, so that the specified inside pipe line is specified. The area can be advantageously subjected to anticorrosion treatment in terms of cost and construction.

Partially cutaway front view when the bush mounting machine showing the first embodiment of the present invention is attached Enlarged partially cutaway front view of a bushing machine III-III sectional view of FIG. An enlarged cross-sectional view of the main part when a bushing machine is installed Enlarged plan view of the locking body Enlarged sectional view of the locking body Enlarged sectional view of the main part when inserting the rust prevention bush Enlarged cross-sectional view of the main part when the rust-proof bushing is inserted in place Enlarged cross-sectional view of the main part when a part of the rust-proof bushing is expanded and deformed Enlarged sectional view of the main part when the bushing machine is removed The enlarged plan view of the latching body which shows 2nd Embodiment of this invention The expanded sectional view of the principal part when a 3rd embodiment of the present invention is shown and a rust prevention bush is inserted in the maximum feeding position Enlarged cross-sectional view of the main part when the rust-proof bushing is returned by a predetermined amount Enlarged cross-sectional view of the main part when a part of the rust-proof bushing is expanded and deformed Enlarged sectional view of the main part when the bushing machine is removed The expanded sectional view of the principal part which shows 4th Embodiment of this invention. Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 5th Embodiment of this invention Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the important section showing a 6th embodiment of the present invention. Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 7th Embodiment of this invention Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 8th Embodiment of this invention. Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 9th Embodiment of this invention Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 10th Embodiment of this invention. Enlarged sectional view of locking body and seat packing Enlarged plan view of locking body and seat packing The expanded sectional view of the principal part which shows 11th Embodiment of this invention Enlarged sectional view of locking body and seat packing Enlarged plan view of locking body and seat packing

[First Embodiment]
FIGS. 1-10 shows the anticorrosion construction method and the anticorrosion structure which gave the antirust process by the antirust bushing 8 to the predetermined location in the fluid piping system, and the water supply made from the cast iron pipe which is an example of a fluid pipe The upstream connection of the connecting flange portion 2A of the branch pipe portion 2 as an upstream side pipe portion integrally formed in the middle of the pipe 1 and the repair valve 3 as the downstream side pipe portion which is an example of a fluid device or a piping material. Between the joint surface with the flange portion 3A, a tube shaft core (hereinafter referred to as a branch shaft core) protruding toward the flow channel side in the X direction faces the flow channel side between the pair of convex portions 4a and the both convex portions 4a. A metal-made (for example, stainless steel, etc.) annular locking body 4 provided with a concave and convex portion (engaging portion) 4A composed of one concave portion 4b that opens and is provided on both sides of the locking body 4 In the annular seal mounting groove 4c formed on the surface, the connecting flange portion 2A, An O-ring 5 which is an example of a sealing material that seals between A and A is attached, and a plurality of sets of connection flange portions 2A of the branch pipe portion 2 and upstream connection flange portions 3A of the repair valve 3 (this embodiment) In this case, the bolts 6A and nuts 6B are tightened and connected so as to be detachable in a sealed state.

  As shown in FIGS. 5 and 6, both convex portions 4 a and concave portions 4 b constituting the concave and convex portion 4 </ b> A of the locking body 4 are formed in an annular shape that is continuous in the circumferential direction. The inner diameter D1 of the branch pipe portion 2 is smaller than the inner diameter of the inner peripheral surface 2a of the branch pipe portion 2 and the inner diameter of the inner peripheral surface 3a of the connection pipe portion of the repair valve 3, and the inner diameter D2 of the concave portion 4b is branched. The inner diameter of the inner peripheral surface 2 a of the pipe portion 2 and the inner diameter of the inner peripheral surface 3 a in the connecting pipe portion of the repair valve 3 are configured to be larger.

  The outer diameter D3 of the locking body 4 is configured to be the same as the outer diameter of the connecting flange portion 2A of the branch pipe portion 2 and the outer diameter of the upstream connecting flange portion 3A of the repair valve 3, Bolt insertion holes 4 d for the bolts 6 </ b> A of the fastener 6 are formed through the four places in the circumferential direction of the locking body 4.

  The downstream connection flange portion 3B of the repair valve 3 includes an upstream connection flange portion 7A of a connection tube (short tube) 7 as a downstream tube portion (joint flange), and a sealing material between the joint surfaces. And a downstream connecting flange portion of the connecting pipe 7 that is detachably tightened and connected with a fastener 6 including a plurality of sets of bolts 6A and nuts 6B in a state where a sheet packing as an example is interposed. 7B includes a bush insertion means for inserting a metal (for example, stainless steel, etc.) rust prevention bush 8 at a predetermined position in the pipe in a state where a part of the outer peripheral surface faces the concavo-convex portion 4A of the locking body 4. Of the rust preventive bush 8 inserted at a predetermined position in the pipe (bush insertion function), the portion corresponding to the locking body 4 is bulged and deformed outward in the radial direction. Locking the bulging deformation portion 8A 4. A bush provided with bush diameter increasing means that engages with the four concavo-convex portions 4A so as not to be relatively movable in the tube axis direction (if this bush diameter expansion function is used, it becomes a bush diameter expansion machine as a dedicated machine). The connecting flange 10A of the mounting machine A is attached and detached in a sealed state with a fastener 6 including a plurality of sets of bolts 6A and nuts 6B with an O-ring 9 as an example of a sealing material interposed between the joint surfaces. Tightly connected as possible.

  As shown in FIGS. 1 to 4, the bush mounting machine A is attached to the mounting cylinder member 10 having the connecting flange portion 10 </ b> A with the lower side of the inner and outer double feed shafts 11, 12 in the branch axis X direction. A first bearing member 13 having a boss portion 13a for slidably penetrating and supporting is attached, and the inner side extends over the upper end portion of the connecting shaft 14 screwed and fixed to three positions of the first bearing member 13. To reciprocate the through-hole 17a and the feed shafts 11 and 12 in the branch axis X direction with respect to the diameter-expansion operation nut 15 which is an example of the diameter-expansion operation tool screwed into the upper screw portion 11a of the feed shaft 11. A second bearing member 17 having a through hole 17 b for the feed screw shaft 16 is fastened and fixed via a nut 18.

  The interlocking member 20 fixedly connected to the upper flange portion 12a of the outer feed shaft 12 with a bolt 19 is attached with a screw piece 21 screwed to the male screw portion 16a of the feed screw shaft 16 in a relatively non-rotatable state. Of the interlocking member 20, a diameter increasing operation nut 15 is attached to a boss portion 20a that forms a through hole for the upper screw portion 11a of the inner feed shaft 11 in a relatively rotatable manner.

  The feed screw shaft 16 is rotatably supported in a supported state across the first bearing member 13 and the second bearing member 17, and the feed shaft 11 is supported at the upper end of the feed screw shaft 16. , 12 is attached to a rotary operation handle 22 for reciprocating in the branch axis X direction.

  A bottomed cylindrical metal receiving member 23 attached to the lower end of the outer feed shaft 12 and a metal attached to the lower end of the inner feed shaft 11 projecting downward through the center of the receiving member 23. A taper-shaped feed restricting surface 4e formed on the downstream convex portion 4a of the locking body 4 is formed between the presser member 24 and the outer peripheral surface of the cylindrical shaft portion 24a of the presser member 24. On the other hand, relative restriction movement between the metal restricting member 26 having a tapered stopper surface 26a abutting from the branch axis X direction and the receiving member 23 and the pressing member 24, that is, the receiving member 23 and the restricting member. An elastic body 25 for expanding the diameter made of synthetic rubber (urethane rubber or the like) that is bulged and deformed outward in the radial direction as the presser member 24 is lifted relative to 26 is provided.

Next, the anticorrosion construction method of the fluid piping in the continuous water state will be described.
(A) In the piping system in which the upstream side connecting flange portion 3A of the repair valve 3 is fixedly connected in a sealed state to the connecting flange portion 2A of the branch pipe portion 2 formed integrally protruding in the middle of the water pipe 1. When a rust prevention bushing 8 is applied to a predetermined portion of the inner peripheral surface of the branch pipe part 2, first, the flow path of the branch pipe part 2 can be blocked by the downstream connection flange part 3B of the repair valve 3. A flow path closing jig having a well-known structure provided with a closing means is attached in a sealed state, and the closing means of the flow path closing jig is sent to a predetermined position in the branch pipe portion 2 through the repair valve 3 which is opened. The flow path of the branch pipe part 2 is shut off by the closing means.

(B) As shown in FIGS. 1 and 7, the repair valve 3 is removed from the connecting flange portion 2 </ b> A of the branch pipe portion 2 with the flow path of the branch pipe portion 2 blocked, and the branch pipe portion 2 is connected. Between the joint surfaces of the flange portion 2A and the upstream connection flange portion 3A of the repair valve 3, a locking body 4 having the uneven portion 4A is provided, and seal mounting grooves 4c on both side surfaces of the locking body 4 are provided. Is equipped with an O-ring 5 that seals between the connecting flange portions 2A and 3A, and the connecting flange portion 2A of the branch pipe portion 2 and the repair valve 3 or the new repair valve 3 removed in the previous step. After the upstream connection flange portion 3A is tightened and connected in a sealed state with a fastener 6 including a plurality of sets of bolts 6A and nuts 6B, the repair valve 3 is operated to open the closing means of the flow path closing jig. Remove to the outside through.

(C) Then, as shown in FIGS. 2 and 4, the rust preventive bush 8 is externally attached to the diameter-expanding elastic body 25 of the bush mounting machine D through the pressing portion of the pressing member 24, and the diameter-expanding operation nut 15. Is slightly rotated toward the diameter expansion side, and the holding member 24 of the inner feed shaft 11 and the receiving member 23 of the outer feed shaft 12 are moved relatively close to each other to slightly expand and deform the diameter expansion elastic body 25. The rust prevention bush 8 is temporarily held by the elastic body 25 for expanding the diameter of the bush mounting machine D.

(D) Next, as shown in FIGS. 4 and 7, the upstream connection flange portion 7 </ b> A of the connection pipe 7 as the downstream pipe portion (joint flange) is attached to the downstream connection flange portion 3 </ b> B of the repair valve 3. In a state where the sheet packing is interposed between the joint surfaces, the fastener 6 including a plurality of sets of bolts 6A and nuts 6B is tightened and connected in a sealed state, and the downstream connection flange portion 7B of the connection pipe 7 is connected to the downstream connection flange portion 7B. Then, the connecting flange portion 10A of the bush mounting machine D is fixedly connected, and after opening the valve body 3C of the repair valve 3, the handle 22 of the bush mounting machine D is rotated to the feeding side as shown in FIG. Then, both the feed shafts 11 and 12 are moved forward along the branch axis X direction, and the rust preventive bush 8 temporarily held by the diameter-enlarging elastic body 25 is fixed to the tapered stopper of the restriction member 26. The surface 26 a is a downstream convex portion 4 of the locking body 4. Fed from the branch axis X direction tapered infeed regulating surface 4e formed to abut.

  In this state, the upper portion of the rust preventive bush 8 inserted at a predetermined position in the pipe is opposed to the concavo-convex portion 4 </ b> A of the locking body 4.

(E) As shown in FIGS. 9 and 10, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted in a predetermined position in the branch pipe portion 2, the outer feed The inner feed shaft 11 is pulled up with respect to the shaft 12, and the elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X along with the relative movement of the receiving member 23 and the pressing member 24. The rust-proof bushing 8 is deformed outwardly in the radial direction, and the upper portion of the rust prevention bush 8 is plastically deformed in an irregular shape along the concavo-convex portion 4A of the locking body 4, and this bulging-deformed bulge is maintained. When the annular convex portion 8a and the annular concave portion 8b of the protruding deformable portion 8A are engaged with the annular concave portion 4b and the annular convex portion 4a constituting the concave and convex portion 4A of the locking body 4, the rust preventive bush 8 is separated from the branch axis X. Mounted at a predetermined position in the branch pipe portion 2 in a state in which relative movement is impossible in the direction.

(F) The repair valve 3 is closed to remove the connection flange portion 10A of the bush mounting machine D from the downstream connection flange portion 7B of the connection pipe 7, and the downstream connection flange portion 3B of the repair valve 3 After removing the upstream connection flange portion 7A of the connection pipe 7, another device such as an air valve is attached to the downstream connection flange portion 3B of the repair valve 3 as necessary.

[Second Embodiment]
In the first embodiment described above, both the convex portions 4a and the concave portions 4b constituting the concave and convex portions 4A of the locking body 4 are formed in an annular shape that is continuous in the circumferential direction, but as shown in FIG. Both convex portions 4a may be intermittently formed in the circumferential direction.

  And if the site | part corresponding to the said both convex parts 4a and the recessed part 4b of the said anticorrosion bush 8 bulges and deforms to radial direction outward, this bulging deformation part 8A will be the circumference of the annular convex part 4a or the recessed part 4b, or substantially. Since it engages on the entire circumference, even if there is a variation in the circumferential allowance of both 4 and 8, both 4 and 8 can be securely and securely fixed so that they cannot be moved relative to each other in the branch axis X direction. it can.

Moreover, although not shown in figure, you may form intermittently the both convex part 4a and the recessed part 4b which comprise the uneven | corrugated | grooved part 4A of the said latching body 4 in the circumferential direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
FIGS. 12 to 15 show another embodiment of the anticorrosion structure and anticorrosion method of the fluid pipe, and as an upstream side pipe portion integrally projectingly formed in the middle of a cast iron pipe water pipe 1 which is an example of a fluid pipe. Between the connecting flange portion 2A of the branch pipe portion 2 and the upstream connection flange portion 3A of the repair valve 3 which is an example of a fluid device or piping material, toward the flow path side on the downstream side in the branch axis X direction. Made of metal (for example, stainless steel) provided with a concavo-convex part (engagement part) 4A composed of one convex part 4a projecting and one concave part 4b opening toward the flow path side upstream in the branch axis X direction And a seat packing 5 as an example of a sealing material is mounted between the opposing surfaces of both side surfaces of the locking body 4 and the connecting flange portions 2A and 3A. The connecting flange portion 2A of the branch pipe portion 2 and the repair valve 3 And a flow-side joining flange portions 3A, (in this embodiment four pairs) a plurality of sets are then detachably fastened coupled sealingly with the fastener 6 consisting of bolts 6A · nuts 6B of.

  The convex part 4a and the concave part 4b constituting the concave and convex part 4A of the locking body 4 are formed in an annular shape that is continuous in the circumferential direction, and the inner diameter D1 of the convex part 4a is the inner circumference of the branch pipe part 2 The inner diameter D2 of the concave portion 4b is smaller than the inner diameter of the inner peripheral surface 3a of the connecting pipe portion of the repair valve 3 and the inner diameter D2 of the concave portion 4b. The inner diameter 3a of the connecting pipe portion of the valve 3 is larger than the inner diameter.

In the anticorrosion method according to the third embodiment, the handle 22 of the bush mounting machine D is rotated to the feeding side to move both the feeding shafts 11 and 12 along the branch axis X direction to expand the diameter. The antirust bush 8 temporarily held by the elastic body 25 is a tapered feed restricting surface in which the tapered stopper surface 26a of the restricting member 26 is formed on the downstream convex portion 4a of the engaging member 4. 4e is fed until it comes into contact with the branch axis X from the direction of the branch axis X, and then the handle 22 is rotated to the return side so that the convex portion 4a of the locking body 4 is positioned at a predetermined intermediate position of the elastic body 25 for diameter expansion. Return only a predetermined dimension.
The predetermined return dimension of the return process is such that the rust preventive bush 8 corresponding to the convex portion 4a of the locking body 4 is reliably bulged and deformed into an annular concave shape along the convex portion 4a, and the valve of the repair valve 3 The dimension (for example, 15 mm-20 mm) which the body 3C and the upper end part of the rust prevention bush 8 do not interfere is set.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust preventive bushing 8 is plastically deformed in a concavo-convex shape along the concavo-convex portion 4A of the locking body 4, and the annular concave portion 8b and the annular portion of the bulged deformed portion 8A which is bulged and deformed are maintained. By engaging the convex portion 8a with the annular concave portion 4b and the annular convex portion 4a constituting the concave and convex portion 4A of the locking body 4, the rust preventive bush 8 is in the state in which the relative movement in the branch axis X direction is impossible. It is fixedly mounted at a predetermined position in the tube portion 2.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fourth Embodiment]
16 and 17 show another embodiment of the anticorrosion structure of the fluid pipe, and a branch pipe as an upstream side pipe portion integrally formed and protruded in the middle of a water pipe 1 made of cast iron pipe which is an example of the fluid pipe One convex part (engagement part) which protrudes toward the flow path side between the joint surfaces of the connection flange part 2A of the part 2 and the upstream connection flange part 3A of the repair valve 3 which is an example of a fluid device or piping material An annular locking body 4 made of metal (for example, made of stainless steel) provided with 4a as an inner peripheral surface 4f is provided, and both side surfaces of the locking body 4 and the coupling flange portions 2A and 3A are opposed to each other. A sheet packing 5, which is an example of a sealing material, is mounted between the surfaces, and the connection flange portion 2 </ b> A of the branch pipe portion 2 and the upstream connection flange portion 3 </ b> A of the repair valve 3 are composed of a plurality of sets of bolts 6 </ b> A and nuts 6 </ b> B. The fastener 6 is tightly connected so as to be detachable in a sealed state. .

  The convex portion 4 a of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the convex portion 4 a is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the repair valve 3. It is comprised smaller than the internal diameter of the internal peripheral surface 3a in a connection pipe part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state of being plastically deformed into a concave shape along the convex portion 4a of the locking body 4, and the annular concave portion 8b of the bulging deformed deformation portion 8A is the aforementioned engagement. By engaging with the convex portion 4a of the stationary body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fifth Embodiment]
FIG. 18 and FIG. 19 show another embodiment of the anticorrosion structure of the fluid pipe, and a branch pipe as an upstream side pipe portion integrally formed in the middle of a water pipe 1 made of cast iron pipe, which is an example of a fluid pipe. One recess (engagement portion) 4b that opens toward the flow path side between the joint surfaces of the connection flange portion 2A of the portion 2 and the upstream connection flange portion 3A of the repair valve 3 that is an example of a fluid device or piping material. Is provided on the inner peripheral surface 4f of an annular locking body 4 made of metal (for example, stainless steel or the like) and between the both side surfaces of the locking body 4 and the connecting flange portions 2A and 3A. A sheet packing 5 as an example of a sealing material is mounted between the opposing surfaces, and the connection flange portion 2A of the branch pipe portion 2 and the upstream connection flange portion 3A of the repair valve 3 are connected from a plurality of sets of bolts 6A and nuts 6B. The fastening device 6 is tightly connected so as to be detachable in a sealed state. That.

  The recess 4 b of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the recess 4 b is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the connection pipe of the repair valve 3. The inner diameter of the inner circumferential surface 4f of the locking body 4 is set to be larger than the inner diameter of the inner circumferential surface 2a of the branch pipe portion 2 and the connecting pipe of the repair valve 3. It is comprised by the same diameter as the internal diameter of the internal peripheral surface 3a in a part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state in which it is plastically deformed in a convex shape along the concave portion 4b of the locking body 4, and the annular convex portion 8a of the bulging deformed portion 8A that is bulged and deformed is By engaging with the annular recess 4 b of the locking body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Sixth Embodiment]
In the fifth embodiment described above, one recess 4b that opens toward the flow path side is formed on the inner peripheral surface 4f of the locking body 4. However, as shown in FIGS. 4 is configured to have a larger inner diameter than the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the inner diameter of the inner peripheral surface 3 a of the connection pipe portion of the repair valve 3. One annular recess 4b that opens toward the flow path side may be formed by the inner peripheral surface 4f of this, the inner peripheral surface 2a of the branch pipe portion 2, and the inner peripheral surface 3a of the connection pipe portion of the repair valve 3.

  The locking body 4 is an interval forming body for revealing one concave portion 4b that opens toward the flow path side, and directly with the annular convex portion 8a of the bulging deformation portion 8A of the rust prevention bush 8. Is not engaged, but forms a step for engaging with the annular convex portion 8a.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust preventive bush 8 is maintained in a state of being plastically deformed in a convex shape along the annular recess 4b appearing in the locking body 4, and the bulging deformed portion 8A thus bulged and deformed is maintained. When the annular convex portion 8a engages with the annular concave portion 4b, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 5th Embodiment, the same number is attached to the same component location as 5th Embodiment, and the description is abbreviate | omitted.

[Seventh Embodiment]
FIG. 22 and FIG. 23 show another embodiment of the anticorrosion structure of the fluid pipe, and a branch pipe as an upstream pipe portion integrally formed in the middle of a water pipe 1 made of cast iron pipe, which is an example of a fluid pipe. Of the joint surfaces between the connection flange portion 2A of the part 2 and the upstream connection flange portion 3A of the repair valve 3 which is an example of a fluid device or piping material, the joint surface of the upstream connection flange portion 3A of the repair valve 3 is A mounting groove 27 that opens toward the joint surface of the connecting flange portion 2A of the branch pipe portion 2 and the flow channel side is formed, and one convex portion (engagement portion) that protrudes toward the flow channel side is formed in the mounting groove 27. An annular locking body 4 made of metal (for example, made of stainless steel or the like) provided with 4a as an inner peripheral surface 4f is provided, and the connection flange portions 2A and 3A facing one side of the locking body 4 are provided. A sheet packing 5 as an example of a sealing material is mounted between the opposing surfaces, The connecting flange portion 2A of the branch pipe portion 2 and the upstream side connecting flange portion 3A of the repair valve 3 are tightened and connected so as to be detachable in a sealed state by a fastener 6 comprising a plurality of sets of bolts 6A and nuts 6B. .

  The convex portion 4 a of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the convex portion 4 a is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the repair valve 3. It is comprised smaller than the internal diameter of the internal peripheral surface 3a in a connection pipe part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state of being plastically deformed into a concave shape along the convex portion 4a of the locking body 4, and the annular concave portion 8b of the bulging deformed deformation portion 8A is the aforementioned engagement. By engaging with the convex portion 4a of the stationary body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

  In the seventh embodiment, the mounting groove 27 for attaching the locking body 4 is formed on the joint surface of the upstream connecting flange portion 3A of the repair valve 3. You may form in the joint surface of 2 A of connection flange parts of the pipe part 2, and both the joint surface of 3 A of upstream connection flange parts of the said repair valve 3, and the joint surface of 2 A of connection flange parts of the branch pipe part 2 You may form over.

[Eighth Embodiment]
24 and 25 show another embodiment of the anti-corrosion structure for fluid piping described in the seventh embodiment, and the convex portion 4a of the locking body 4 and the inner peripheral surface 3a of the connecting pipe portion of the repair valve 3; In order to repair the lining layer peeled off by the cutting of the mounting groove 27, a cylindrical anticorrosion core 28 made of stainless steel or the like having excellent corrosion resistance is expanded and deformed so as to be covered and attached in a close contact state.
In addition, since the other structure is the same as the structure demonstrated in 7th Embodiment, the same number is attached to the same component location as 7th Embodiment, and the description is abbreviate | omitted.

[Ninth Embodiment]
FIG. 26 and FIG. 27 show another embodiment of the anticorrosion structure of the fluid pipe, and a branch pipe as an upstream side pipe portion integrally formed in the middle of a water pipe 1 made of cast iron pipe, which is an example of a fluid pipe. One convex part (engagement part) which protrudes toward the flow path side between the joint surfaces of the connection flange part 2A of the part 2 and the upstream connection flange part 3A of the repair valve 3 which is an example of a fluid device or piping material An annular locking body 4 made of metal (for example, stainless steel) provided with 4a as an inner peripheral surface 4f is provided, and the entire periphery of the locking body 4 is opposed to the connecting flange portions 2A and 3A. A plurality of sets of the connecting flange portion 2A of the branch pipe portion 2 and the upstream connecting flange portion 3A of the repair valve 3 are covered with an elastic protective layer 29 that exhibits the same function as an elastic sealing material for sealing between the surfaces. Fastened in a sealed state with a fastener 6 consisting of a bolt 6A and nut 6B. Only it is connected.

  The convex portion 4 a of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the convex portion 4 a is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the repair valve 3. It is comprised smaller than the internal diameter of the internal peripheral surface 3a in a connection pipe part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state of being plastically deformed into a concave shape along the convex portion 4a of the locking body 4, and the annular concave portion 8b of the bulging deformed deformation portion 8A is the aforementioned engagement. By engaging with the convex portion 4a of the stationary body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Tenth embodiment]
28 to 30 show another embodiment of the anticorrosion structure of the fluid pipe, show another embodiment of the anticorrosion structure of the fluid pipe, and are integrally formed in the middle of the water pipe 1 made of cast iron pipe, which is an example of the fluid pipe. Between the connecting flange portion 2A of the branch pipe portion 2 as the protruding upstream pipe portion and the upstream connection flange portion 3A of the repair valve 3 which is an example of a fluid device or a piping material, it faces toward the flow path side. An annular locking body 4 made of a metal (for example, stainless steel, etc.) provided with one protruding portion (engagement portion) 4a protruding as an inner peripheral surface 4f, and the coupling flange portions 2A and 3A are opposed to each other A seat packing 5 which is an example of a sealing material for sealing between the surfaces is provided, the engaging body 4 and the seat packing 5 are integrally joined, and the connecting flange portion 2A of the branch pipe portion 2 and the repair valve 3 upstream connection flange portion 3A, a plurality of sets of bolts It is tightened linked detachably sealingly at the fastener 6 consisting of A · nut 6B.

  The convex portion 4 a of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the convex portion 4 a is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the repair valve 3. It is comprised smaller than the internal diameter of the internal peripheral surface 3a in a connection pipe part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state of being plastically deformed into a concave shape along the convex portion 4a of the locking body 4, and the annular concave portion 8b of the bulging deformed deformation portion 8A is the aforementioned engagement. By engaging with the convex portion 4a of the stationary body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Eleventh embodiment]
In the tenth embodiment, the locking body 4 is formed in a flat plate shape along the radial plane. However, as shown in FIGS. 31 to 33, the inner diameter side portion 4g of the locking body 4 is replaced with a repair valve. 3 is bent at a right angle along the inner peripheral surface 3a of the connecting pipe portion 3 or the inner peripheral surface 2a of the branch pipe portion 2, and one convex portion protruding toward the flow path side with the bent inner diameter side portion 4g ( (Engagement part) 4a may be constituted.
Since other configurations are the same as those described in the tenth embodiment, the same components as those in the tenth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[Other Embodiments]
(1) The inner peripheral surface 2a of the branch pipe part 2 and the inner peripheral surface 3a of the connecting pipe part of the repair valve 3, such as the inner peripheral surface of the pipe part constituting a part of the piping system, or the connecting part of the pipe part, A convex portion 4a protruding toward the flow channel side, a concave portion 4b opening toward the flow channel side, or both concave and convex portions 4A are directly formed, and a part of the outer peripheral surface is formed on the convex portion 4a, concave portion 4b or concave and convex portion 4A. Of the rust preventive bush 8 inserted at a predetermined position in the pipe in a face-to-face state, a bulging deformed portion 8A bulged and deformed radially outward at a portion corresponding to the convex portion 4a, the concave portion 4b or the concave and convex portion 4A. May be configured to engage with the convex portion 4a, the concave portion 4b, or the concave and convex portion 4A so as not to be relatively movable in the branch axis X direction.

  (2) In each of the above-described embodiments, the branch pipe portion 2 as an upstream side pipe portion that is integrally projected and formed in the middle of a cast iron pipe water pipe 1 that is an example of the fluid pipe will be described as an example. However, it may be a branch pipe portion of a branch joint that is sheathed on the fluid pipe 1.

  (3) In each of the above-described embodiments, the convex portion 4a that protrudes toward the flow path side between the joint surfaces of the connecting flange portion 2A of the branch pipe portion 2 of the fluid pipe 1 and the connecting flange portion 3A of the repair valve 3. Alternatively, the engaging body 4 provided with the recess 4b that opens toward the flow path side or both the uneven portions 4A is provided, and the engaging body 4 is connected to the branch pipe portion 2 and the repair valve 3. You may provide between the joint surfaces of a connection flange part.

  The present invention provides an anticorrosion structure and an anticorrosion method capable of advantageously performing anticorrosion treatment on a specified area in a fluid pipe in terms of cost and construction.

1 Fluid pipe (water pipe)
2 Pipe part (branch pipe part)
2A Connection flange part 2a Inner peripheral surface 3 Pipe part (repair valve)
3A Connecting flange portion 3a Inner peripheral surface 4 Locking body 4A Concavity and convexity portion 4a Convex portion 4b Concavity portion 5 Seal (O-ring, sheet packing)
8 Antirust bushing 8A bulging deformation part

The present invention relates to a locking body provided between joint surfaces of connecting flange portions of both pipe portions that are flange-joined .

  In the conventional anticorrosion structure for fluid pipes, one or more branch pipes, generally called short pipes, are formed at the end of the pipe at the connecting flange part of the branch pipe part integrally formed in the middle of the fluid pipe. The length extending from the maximum inner diameter position of the trumpet-shaped inner peripheral surface on the base end side (upstream end side) of the branch pipe portion of the fluid pipe to the opening end portion of the most downstream branch pipe. And having a rear end side (downstream end side) formed in an annular shape with an outer diameter that can be engaged with the opening end portion of the most downstream branch pipe from the branch axis direction. Insert a rust bushing, and expand and deform the distal end of this rust prevention bush along the trumpet-shaped inner peripheral surface on the base end side of the branch pipe with a bush diameter expander. It was configured to prevent movement in the direction (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 3-28973

  In the conventional anticorrosion structure for fluid piping, a trumpet-shaped inner peripheral surface on the proximal end side of the branch pipe portion where the inner diameter of the pipe gradually increases, or an inner space expanding on the inner peripheral surface side of the branch port drilled in the fluid pipe is used. Then, by expanding and deforming the tip of the rust prevention bush, the rust prevention bush is prevented from moving downstream in the branch axis direction, and the rust prevention bush is moved upstream in the branch axis direction. Is prevented by folding back the rear end side of the anticorrosion bush in an annular shape with an outer diameter that can be engaged with the opening end portion of the most downstream branch pipe from the branch axis direction.

  Therefore, as the rust-proof bushing, for example, even if it is necessary to rust-proof only a part of the branch pipe, the rust-proof bush is located at the maximum inner diameter position of the trumpet-shaped inner peripheral surface on the base end side of the branch pipe portion of the fluid pipe. A length extending to the opening end of the downstream branch pipe is required, which not only raises the cost of the rust prevention treatment, but also has a problem of receiving various restrictions on the construction of the rust prevention treatment.

The present invention has been made in view of the above-described actual situation, and its main problem is that the anticorrosion structure and the anticorrosion method capable of advantageously performing anticorrosion treatment on the specified area in the fluid pipe in terms of cost and construction. It is in the point which provides the latching body used for .

In the present invention , the convex portion protruding toward the flow channel side or the concave portion opening toward the flow channel side or both of the concave and convex portions are provided at the pipe portion constituting the flow channel or the connection portion of the pipe portion, and this convex portion. Or, among the rust preventive bushes inserted at predetermined positions in the pipe with a part of the outer peripheral surface facing the concave portion or the concave and convex portion, the portion corresponding to the convex portion or the concave portion or the concave and convex portion swells radially outward. The bulging deformed portion that has been deformed may be engaged with the convex portion, the concave portion, or the concave and convex portion so as not to be relatively movable in the tube axis direction.

According to the above Ki構 formed, to anticorrosion treatment the identified region of the fluid conduit, the connection portion of the tube portion or the tube portion corresponds to a part of the anticorrosion treatment area, projecting toward the flow path side Rust prevention is provided in the anticorrosion treatment region at a predetermined position in the pipe in a state where a convex portion or a concave portion opening toward the flow path side or both concave and convex portions are provided, and a part of the outer peripheral surface faces the convex portion or concave portion or concave and convex portion. When a bush is inserted and a portion corresponding to the convex portion, the concave portion or the concave and convex portion of the anticorrosion bush is bulged and deformed radially outward in this state, the bulging deformed portion becomes the convex portion, the concave portion or the concave and convex portion. It is fixedly mounted so as not to be relatively movable in the direction of the tube axis.

  Therefore, by forming the convex portion, the concave portion or the concave-convex portion at the pipe portion or the connecting portion of the pipe portion, a rust-proof treatment region by the rust-proof bush can be freely set, so that a pipe line is configured. The rust-proof bushing can be brought close to the minimum required length, and the specified area in the fluid pipe is advantageously protected against corrosion in terms of cost and construction. can do.

In the present invention , a convex portion protruding toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions are provided between the joint surfaces of the connecting flange portions of both pipe portions that are flange-bonded. In the portion corresponding to the locking body of the rust preventive bush that is provided at a predetermined position in the pipe in a state where a part of the outer peripheral surface faces the locking body, the locking body that exposes the recess is provided. The bulging deformed portion bulging and deforming radially outward may be engaged with the convex portion, the concave portion, or the concave and convex portion so as not to be relatively movable in the tube axis direction.

According to the above Ki構 formed, to anticorrosion treatment the identified region of the fluid tube, between joint surfaces of the joining flange portions of the two pipe portions corresponding to a part of the anticorrosion treatment area, toward the flow path side Protruding convex part or concave part opening toward the flow path side or both of the concave and convex parts are provided, or a locking body that exposes the concave part is provided, and a part of the outer peripheral surface faces the locking body in the pipe When the anticorrosion bushing is inserted into the anticorrosion treatment region which is a predetermined position of the anticorrosion bush and the portion corresponding to the locking body of the anticorrosion bushing bulges and deforms outward in the radial direction in this state, the bulging deformation portion becomes the convex portion. It is fixedly mounted so as not to be relatively movable in the tube axis direction by engaging with the portion, the concave portion or the concave-convex portion.

  In addition, since the locking body is only attached between the joint surfaces of the connecting flange portions of the two pipe portions, the convex portion, the concave portion or the concave and convex portions are integrally formed on the inner peripheral surface of the pipe portion. Thus, the operation for forming the convex portion, the concave portion or the concave-convex portion can be performed efficiently and easily.

  Accordingly, by providing a locking body provided with the convex part, the concave part or the concave part or the convex part between the joint surfaces of the connecting flange parts of the two pipe parts or exposing the concave part, a rust prevention treatment region by the rust prevention bush. Since the length of the rust-proof bushing can be brought close to the minimum required length, it is possible to specify the inside of the fluid pipe. The formed area can be advantageously subjected to anticorrosion treatment in terms of cost and construction.

In this invention , the said convex part, a recessed part, or an uneven | corrugated | grooved part may be formed in the cyclic | annular form continuous in the circumferential direction.

According to the above Ki構 formed, wherein the bulging deformation of the portion corresponding to the radially outward to the projections or recesses or uneven portions of the corrosion protection bush, protrusions the bulging deformation portion is annular or concave or concave-convex portion Therefore, even when there is a variation in the engagement allowance in the circumferential direction, the two can be reliably and strongly fixed so that they cannot move relative to each other in the tube axis direction.

In this invention , the said convex part, a recessed part, or an uneven | corrugated | grooved part may be intermittently formed in the circumferential direction.

According to the above Ki構 formed, wherein the bulging deformation of the portion corresponding to the radially outward to the projections or recesses or uneven portions of the corrosion protection bush, projections or recesses the bulging deformation portion intermittently in the circumferential direction Alternatively, since it engages with the concavo-convex part, both can be securely fixed in the tube axis direction so as not to move relative to each other, and the bulging deformed part between the adjacent end parts in the circumferential direction of the convex part or concave part or concavo-convex part In the case where a part of is engaged in a state of entering, the relative rotation of both can be prevented at the same time.

In the present invention , the locking body may be clamped and fixed via a sealing material between the joint surfaces of the connecting flange portions of both pipe portions.

According to the above Ki構 formation, because it is possible to cover at least a part of both side surfaces of the lock body with a sealing material for sealing between the junction surface of the connecting flange portions of the two pipe portions, the engaging body It is possible to simplify and facilitate the rust-proofing treatment on both side surfaces.

In the present invention , the locking body may be fitted and held in a groove formed in at least one of the joint surfaces of the connecting flange portions of the two pipe portions.

According to the above Ki構 formed, the locking member, by fitting held in a groove formed in at least one of the joining surfaces of the joining flange portions, be reliably, strongly fixing the locking member Not only can the distance between the joint surfaces of the two connecting flange portions be reduced as much as possible.

In this invention , the said latching | locking body may be joined to the sealing material which seals between the joining surfaces of the connection flange part of the said both pipe parts.
According to the above Ki構 formed, it is possible to achieve the coefficient from the stop member and the seal member can be handled as one piece, facilitate the assembling operation of the lock body and the sealant.

In the present invention, the engaging member is formed in an annular shape, the projections or recesses or uneven portion on an inner peripheral surface thereof may be integrally formed.

According to the above Ki構 formed, for example, as in the case of the projections or recesses or uneven portions are dispersedly formed over the inner peripheral surface and the inner peripheral surface of the tube portion continuous therewith of the engaging member, It is not necessary to adjust the relative positional relationship between the component on the locking body side and the component on the pipe inner peripheral surface side, and the assembly work can be facilitated.

In the present invention , an anticorrosion method for fluid piping in which a rust prevention bush is attached to a part of at least one inner peripheral surface of both pipe portions that are flange-joined,
Between the joint surfaces of the connecting flange portions of the two pipe portions, there is provided a convex portion protruding toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions, or a locking body that exposes the concave portion. Among the rust preventive bushes inserted at predetermined positions in the pipe in a state where a part of the outer peripheral surface faces the engaging body, a part of the rust preventing bush corresponding to the engaging body is a bush diameter expanding machine. The bulging deformed portion of the rust preventive bush may be engaged with the convex portion, the concave portion or the concave and convex portion so as not to be relatively movable in the tube axis direction.

According to the above Ki構 formed, to anticorrosion treatment the identified region of the fluid tube, between joint surfaces of the joining flange portions of the two pipe portions corresponding to a part of the anticorrosion treatment area, toward the flow path side Protruding convex part or concave part opening toward the flow path side or both of the concave and convex parts are provided, or a locking body that exposes the concave part is provided, and a part of the outer peripheral surface faces the locking body in the pipe By inserting a rust preventive bush into the anticorrosion treatment region, which is a predetermined position, and in this state, a part corresponding to the locking body of the anticorrosion bush is bulged and deformed radially outward by a bush enlarger. The bulging deformation portion engages with the convex portion, the concave portion or the concave and convex portion, and is fixedly mounted so as not to be relatively movable in the tube axis direction.

  In addition, since the locking body is only attached between the joint surfaces of the connecting flange portions of the two pipe portions, the convex portion, the concave portion or the concave and convex portions are integrally formed on the inner peripheral surface of the pipe portion. Thus, the operation for forming the convex portion, the concave portion or the concave-convex portion can be performed efficiently and easily.

  Accordingly, by providing a locking body provided with the convex part, the concave part or the concave part or the convex part between the joint surfaces of the connecting flange parts of the two pipe parts or exposing the concave part, a rust prevention treatment region by the rust prevention bush. Since the length of the rust-proof bushing can be brought close to the minimum required length, it is possible to specify the inside of the fluid pipe. The formed area can be advantageously subjected to anticorrosion treatment in terms of cost and construction.

In the present invention , between the joint surface of the branch pipe part of the fluid pipe or the connection flange part of the branch pipe part of the branch joint sheathed on the fluid pipe and the connection flange part of the repair valve connected thereto, or the branch pipe part Between the connecting flange portion of the connecting flange portion and the connecting flange portion of the connecting pipe connected thereto, a convex portion projecting toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions, or Of the rust preventive bushes inserted into a predetermined position in the pipe in a state where a part of the outer peripheral surface faces the engaging body, the antirust corresponding to the engaging body is provided. A part of the bush is bulged and deformed outward in the radial direction by a bush enlarger, and the bulging deformed portion of the rust prevention bush cannot be moved relative to the convex portion, concave portion or concave and convex portion in the tube axis direction. It may be engaged.

According to the above Ki構 formed, for example, the branch pipe portion of the outer branch joint branch pipe portion or fluid conduit of the fluid tube or the region spanning up to a part of the repair valve or connecting tube is this flange joint When the anticorrosion treatment is performed, a convex portion projecting toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions are provided between the joint surfaces of both connecting flange portions corresponding to a part of the anticorrosion treatment region. Provided or provided with a locking body that reveals the recess, with a portion of the outer peripheral surface facing this locking body, insert a rust-proof bushing into the anticorrosion treatment region at a predetermined position in the pipe, in this state A part of the anticorrosion bush corresponding to the locking body bulges and deforms outward in the radial direction with a bush diameter expander, so that the bulging deformed part engages with the convex part, the concave part or the concave and convex part, and the tube It is fixedly mounted so that it cannot move relative to the axial direction.

  In addition, since the locking body is only provided between the joint surfaces of the two connecting flange portions, this is compared with the case where the convex portion or the concave portion or the concave and convex portion are integrally formed on the inner peripheral surface of the pipe portion. The operation for forming the convex portion, the concave portion or the concave-convex portion can be easily and efficiently performed.

Accordingly, by providing a locking body provided with the convex part, the concave part or the concave part or the convex part between the joint surfaces of the two connecting flange parts, or exposing the concave part, the rust prevention treatment region by the rust prevention bush can be freely set. Since it can be set, it is difficult to be affected by the form of the pipes constituting the pipe line, and the length of the rust prevention bush can be brought close to the minimum necessary length, so that the specified inside pipe line is specified. The area can be advantageously subjected to anticorrosion treatment in terms of cost and construction.
The first characteristic configuration of the locking body according to the present invention is provided between the joint surfaces of the connecting flange portions of both pipe portions that are flange-joined, and is protruded toward the flow path side or opened toward the flow path side. A bulging deformed portion formed by bulging and deforming a part of the outer peripheral surface of the rust preventive bushing inserted at a predetermined position in the pipe in a radially outward direction. Or it is in the point engaged by an uneven part.
The 2nd characteristic structure of the latching body by this invention exists in the point formed by the cyclic | annular form which the said convex part, a recessed part, or an uneven | corrugated part continues in the circumferential direction.
A third characteristic configuration of the locking body according to the present invention is that it is sandwiched and fixed via a seal material between the joint surfaces of the connecting flange portions of the two pipe portions.
The 4th characteristic structure of the locking body by this invention exists in the point fitted and hold | maintained in the groove | channel formed in at least one of the joint surfaces of the connection flange part of the said both pipe parts.
A fifth characteristic configuration of the locking body according to the present invention is that it is joined to a sealing material that seals between the joint surfaces of the connecting flange portions of the two pipe portions.
A sixth characteristic configuration of the locking body according to the present invention is that it is formed in an annular shape, and the convex portion, the concave portion or the concave-convex portion is integrally formed on the inner peripheral surface thereof.
A seventh characteristic configuration of the locking body according to the present invention is that the convex portion, the concave portion or the concave and convex portion is intermittently formed in the circumferential direction.

The first embodiment of the present invention shows, partially cutaway front view showing a state of attaching the bush mounting machine Enlarged partially cutaway front view of a bushing machine III-III sectional view of FIG. An enlarged cross-sectional view of the main part when a bushing machine is installed Enlarged plan view of the locking body Enlarged sectional view of the locking body Enlarged sectional view of the main part when inserting the rust prevention bush Enlarged cross-sectional view of the main part when the rust-proof bushing is inserted in place Enlarged cross-sectional view of the main part when a part of the rust-proof bushing is expanded and deformed Enlarged sectional view of the main part when the bushing machine is removed The enlarged plan view of the latching body which shows 2nd Embodiment of this invention The expanded sectional view of the principal part when a 3rd embodiment of the present invention is shown and a rust prevention bush is inserted in the maximum feeding position Enlarged cross-sectional view of the main part when the rust-proof bushing is returned by a predetermined amount Enlarged cross-sectional view of the main part when a part of the rust-proof bushing is expanded and deformed Enlarged sectional view of the main part when the bushing machine is removed The expanded sectional view of the principal part which shows 4th Embodiment of this invention. Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 5th Embodiment of this invention Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows the 1st reference example of this invention Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the important section showing a 6th embodiment of the present invention. Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 7th Embodiment of this invention Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 8th Embodiment of this invention. Enlarged sectional view of the main part showing the engagement state of the rust prevention bush The expanded sectional view of the principal part which shows 9th Embodiment of this invention Enlarged sectional view of locking body and seat packing Enlarged plan view of locking body and seat packing The expanded sectional view of the principal part which shows 10th Embodiment of this invention. Enlarged sectional view of locking body and seat packing Enlarged plan view of locking body and seat packing

[First Embodiment]
FIGS. 1-10 shows the anticorrosion construction method and the anticorrosion structure which gave the antirust process by the antirust bushing 8 to the predetermined location in the fluid piping system, and the water supply made from the cast iron pipe which is an example of a fluid pipe The upstream connection of the connecting flange portion 2A of the branch pipe portion 2 as an upstream side pipe portion integrally formed in the middle of the pipe 1 and the repair valve 3 as the downstream side pipe portion which is an example of a fluid device or a piping material. Between the joint surface with the flange portion 3A, a tube shaft core (hereinafter referred to as a branch shaft core) protruding toward the flow channel side in the X direction faces the flow channel side between the pair of convex portions 4a and the both convex portions 4a. A metal-made (for example, stainless steel, etc.) annular locking body 4 provided with a concave and convex portion (engaging portion) 4A composed of one concave portion 4b that opens and is provided on both sides of the locking body 4 In the annular seal mounting groove 4c formed on the surface, the connecting flange portion 2A, An O-ring 5 which is an example of a sealing material that seals between A and A is attached, and a plurality of sets of connection flange portions 2A of the branch pipe portion 2 and upstream connection flange portions 3A of the repair valve 3 (this embodiment) In this case, the bolts 6A and nuts 6B are tightened and connected so as to be detachable in a sealed state.

  As shown in FIGS. 5 and 6, both convex portions 4 a and concave portions 4 b constituting the concave and convex portion 4 </ b> A of the locking body 4 are formed in an annular shape that is continuous in the circumferential direction. The inner diameter D1 of the branch pipe portion 2 is smaller than the inner diameter of the inner peripheral surface 2a of the branch pipe portion 2 and the inner diameter of the inner peripheral surface 3a of the connection pipe portion of the repair valve 3, and the inner diameter D2 of the concave portion 4b is branched. The inner diameter of the inner peripheral surface 2 a of the pipe portion 2 and the inner diameter of the inner peripheral surface 3 a in the connecting pipe portion of the repair valve 3 are configured to be larger.

  The outer diameter D3 of the locking body 4 is configured to be the same as the outer diameter of the connecting flange portion 2A of the branch pipe portion 2 and the outer diameter of the upstream connecting flange portion 3A of the repair valve 3, Bolt insertion holes 4 d for the bolts 6 </ b> A of the fastener 6 are formed through the four places in the circumferential direction of the locking body 4.

  The downstream connection flange portion 3B of the repair valve 3 includes an upstream connection flange portion 7A of a connection tube (short tube) 7 as a downstream tube portion (joint flange), and a sealing material between the joint surfaces. And a downstream connecting flange portion of the connecting pipe 7 that is detachably tightened and connected with a fastener 6 including a plurality of sets of bolts 6A and nuts 6B in a state where a sheet packing as an example is interposed. 7B includes a bush insertion means for inserting a metal (for example, stainless steel, etc.) rust prevention bush 8 at a predetermined position in the pipe in a state where a part of the outer peripheral surface faces the concavo-convex portion 4A of the locking body 4. Of the rust preventive bush 8 inserted at a predetermined position in the pipe (bush insertion function), the portion corresponding to the locking body 4 is bulged and deformed outward in the radial direction. Locking the bulging deformation portion 8A 4. A bush provided with bush diameter increasing means that engages with the four concavo-convex portions 4A so as not to be relatively movable in the tube axis direction (if this bush diameter expansion function is used, it becomes a bush diameter expansion machine as a dedicated machine). The connecting flange 10A of the mounting machine A is attached and detached in a sealed state with a fastener 6 including a plurality of sets of bolts 6A and nuts 6B with an O-ring 9 as an example of a sealing material interposed between the joint surfaces. Tightly connected as possible.

  As shown in FIGS. 1 to 4, the bush mounting machine A is attached to the mounting cylinder member 10 having the connecting flange portion 10 </ b> A with the lower side of the inner and outer double feed shafts 11, 12 in the branch axis X direction. A first bearing member 13 having a boss portion 13a for slidably penetrating and supporting is attached, and the inner side extends over the upper end portion of the connecting shaft 14 screwed and fixed to three positions of the first bearing member 13. To reciprocate the through-hole 17a and the feed shafts 11 and 12 in the branch axis X direction with respect to the diameter-expansion operation nut 15 which is an example of the diameter-expansion operation tool screwed into the upper screw portion 11a of the feed shaft 11. A second bearing member 17 having a through hole 17 b for the feed screw shaft 16 is fastened and fixed via a nut 18.

  The interlocking member 20 fixedly connected to the upper flange portion 12a of the outer feed shaft 12 with a bolt 19 is attached with a screw piece 21 screwed to the male screw portion 16a of the feed screw shaft 16 in a relatively non-rotatable state. Of the interlocking member 20, a diameter increasing operation nut 15 is attached to a boss portion 20a that forms a through hole for the upper screw portion 11a of the inner feed shaft 11 in a relatively rotatable manner.

  The feed screw shaft 16 is rotatably supported in a supported state across the first bearing member 13 and the second bearing member 17, and the feed shaft 11 is supported at the upper end of the feed screw shaft 16. , 12 is attached to a rotary operation handle 22 for reciprocating in the branch axis X direction.

  A bottomed cylindrical metal receiving member 23 attached to the lower end of the outer feed shaft 12 and a metal attached to the lower end of the inner feed shaft 11 projecting downward through the center of the receiving member 23. A taper-shaped feed restricting surface 4e formed on the downstream convex portion 4a of the locking body 4 is formed between the presser member 24 and the outer peripheral surface of the cylindrical shaft portion 24a of the presser member 24. On the other hand, relative restriction movement between the metal restricting member 26 having a tapered stopper surface 26a abutting from the branch axis X direction and the receiving member 23 and the pressing member 24, that is, the receiving member 23 and the restricting member. An elastic body 25 for expanding the diameter made of synthetic rubber (urethane rubber or the like) that is bulged and deformed outward in the radial direction as the presser member 24 is lifted relative to 26 is provided.

Next, a description will be given of the anti-corrosion construction method of the fluid piping in without suspension of water supply condition.
(A) In the piping system in which the upstream side connecting flange portion 3A of the repair valve 3 is fixedly connected in a sealed state to the connecting flange portion 2A of the branch pipe portion 2 formed integrally protruding in the middle of the water pipe 1. When a rust prevention bushing 8 is applied to a predetermined portion of the inner peripheral surface of the branch pipe part 2, first, the flow path of the branch pipe part 2 can be blocked by the downstream connection flange part 3B of the repair valve 3. A flow path closing jig having a well-known structure provided with a closing means is attached in a sealed state, and the closing means of the flow path closing jig is sent to a predetermined position in the branch pipe portion 2 through the repair valve 3 which is opened. The flow path of the branch pipe part 2 is shut off by the closing means.

(B) As shown in FIGS. 1 and 7, the repair valve 3 is removed from the connecting flange portion 2 </ b> A of the branch pipe portion 2 with the flow path of the branch pipe portion 2 blocked, and the branch pipe portion 2 is connected. Between the joint surfaces of the flange portion 2A and the upstream connection flange portion 3A of the repair valve 3, a locking body 4 having the uneven portion 4A is provided, and seal mounting grooves 4c on both side surfaces of the locking body 4 are provided. Is equipped with an O-ring 5 that seals between the connecting flange portions 2A and 3A, and the connecting flange portion 2A of the branch pipe portion 2 and the repair valve 3 or the new repair valve 3 removed in the previous step. After the upstream connection flange portion 3A is tightened and connected in a sealed state with a fastener 6 including a plurality of sets of bolts 6A and nuts 6B, the repair valve 3 is operated to open the closing means of the flow path closing jig. Remove to the outside through.

(C) Then, as shown in FIGS. 2 and 4, the rust preventive bush 8 is externally attached to the diameter-expanding elastic body 25 of the bush mounting machine D through the pressing portion of the pressing member 24, and the diameter-expanding operation nut 15. Is slightly rotated toward the diameter expansion side, and the holding member 24 of the inner feed shaft 11 and the receiving member 23 of the outer feed shaft 12 are moved relatively close to each other to slightly expand and deform the diameter expansion elastic body 25. The rust prevention bush 8 is temporarily held by the elastic body 25 for expanding the diameter of the bush mounting machine D.

(D) Next, as shown in FIGS. 4 and 7, the upstream connection flange portion 7 </ b> A of the connection pipe 7 as the downstream pipe portion (joint flange) is attached to the downstream connection flange portion 3 </ b> B of the repair valve 3. In a state where the sheet packing is interposed between the joint surfaces, the fastener 6 including a plurality of sets of bolts 6A and nuts 6B is tightened and connected in a sealed state, and the downstream connection flange portion 7B of the connection pipe 7 is connected to the downstream connection flange portion 7B. Then, the connecting flange portion 10A of the bush mounting machine D is fixedly connected, and after opening the valve body 3C of the repair valve 3, the handle 22 of the bush mounting machine D is rotated to the feeding side as shown in FIG. Then, both the feed shafts 11 and 12 are moved forward along the branch axis X direction, and the rust preventive bush 8 temporarily held by the diameter-enlarging elastic body 25 is fixed to the tapered stopper of the restriction member 26. The surface 26 a is a downstream convex portion 4 of the locking body 4. Fed from the branch axis X direction tapered infeed regulating surface 4e formed to abut.

  In this state, the upper portion of the rust preventive bush 8 inserted at a predetermined position in the pipe is opposed to the concavo-convex portion 4 </ b> A of the locking body 4.

(E) As shown in FIGS. 9 and 10, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted in a predetermined position in the branch pipe portion 2, the outer feed The inner feed shaft 11 is pulled up with respect to the shaft 12, and the elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X along with the relative movement of the receiving member 23 and the pressing member 24. The rust-proof bushing 8 is deformed outwardly in the radial direction, and the upper portion of the rust prevention bush 8 is plastically deformed in an irregular shape along the concavo-convex portion 4A of the locking body 4, and this bulging-deformed bulge is maintained. When the annular convex portion 8a and the annular concave portion 8b of the protruding deformable portion 8A are engaged with the annular concave portion 4b and the annular convex portion 4a constituting the concave and convex portion 4A of the locking body 4, the rust preventive bush 8 is separated from the branch axis X. Mounted at a predetermined position in the branch pipe portion 2 in a state in which relative movement is impossible in the direction.

(F) The repair valve 3 is closed to remove the connection flange portion 10A of the bush mounting machine D from the downstream connection flange portion 7B of the connection pipe 7, and the downstream connection flange portion 3B of the repair valve 3 After removing the upstream connection flange portion 7A of the connection pipe 7, another device such as an air valve is attached to the downstream connection flange portion 3B of the repair valve 3 as necessary.

[Second Embodiment]
In the first embodiment described above, both the convex portions 4a and the concave portions 4b constituting the concave and convex portions 4A of the locking body 4 are formed in an annular shape that is continuous in the circumferential direction, but as shown in FIG. Both convex portions 4a may be intermittently formed in the circumferential direction.

  And if the site | part corresponding to the said both convex parts 4a and the recessed part 4b of the said anticorrosion bush 8 bulges and deforms to radial direction outward, this bulging deformation part 8A will be the circumference of the annular convex part 4a or the recessed part 4b, or substantially. Since it engages on the entire circumference, even if there is a variation in the circumferential allowance of both 4 and 8, both 4 and 8 can be securely and securely fixed so that they cannot be moved relative to each other in the branch axis X direction. it can.

Moreover, although not shown in figure, you may form intermittently the both convex part 4a and the recessed part 4b which comprise the uneven | corrugated | grooved part 4A of the said latching body 4 in the circumferential direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
FIGS. 12 to 15 show another embodiment of the anticorrosion structure and anticorrosion method of the fluid pipe, and as an upstream side pipe portion integrally projectingly formed in the middle of a cast iron pipe water pipe 1 which is an example of a fluid pipe. Between the connecting flange portion 2A of the branch pipe portion 2 and the upstream connection flange portion 3A of the repair valve 3 which is an example of a fluid device or piping material, toward the flow path side on the downstream side in the branch axis X direction. Made of metal (for example, stainless steel) provided with a concavo-convex part (engagement part) 4A composed of one convex part 4a projecting and one concave part 4b opening toward the flow path side upstream in the branch axis X direction And a seat packing 5 as an example of a sealing material is mounted between the opposing surfaces of both side surfaces of the locking body 4 and the connecting flange portions 2A and 3A. The connecting flange portion 2A of the branch pipe portion 2 and the repair valve 3 And a flow-side joining flange portions 3A, (in this embodiment four pairs) a plurality of sets are then detachably fastened coupled sealingly with the fastener 6 consisting of bolts 6A · nuts 6B of.

  The convex part 4a and the concave part 4b constituting the concave and convex part 4A of the locking body 4 are formed in an annular shape that is continuous in the circumferential direction, and the inner diameter D1 of the convex part 4a is the inner circumference of the branch pipe part 2 The inner diameter D2 of the concave portion 4b is smaller than the inner diameter of the inner peripheral surface 3a of the connecting pipe portion of the repair valve 3 and the inner diameter D2 of the concave portion 4b. The inner diameter 3a of the connecting pipe portion of the valve 3 is larger than the inner diameter.

In the anticorrosion method according to the third embodiment, the handle 22 of the bush mounting machine D is rotated to the feeding side to move both the feeding shafts 11 and 12 along the branch axis X direction to expand the diameter. The antirust bush 8 temporarily held by the elastic body 25 is a tapered feed restricting surface in which the tapered stopper surface 26a of the restricting member 26 is formed on the downstream convex portion 4a of the engaging member 4. 4e is fed until it comes into contact with the branch axis X from the direction of the branch axis X, and then the handle 22 is rotated to the return side so that the convex portion 4a of the locking body 4 is positioned at a predetermined intermediate position of the elastic body 25 for diameter expansion. Return only a predetermined dimension.
The predetermined return dimension of the return process is such that the rust preventive bush 8 corresponding to the convex portion 4a of the locking body 4 is reliably bulged and deformed into an annular concave shape along the convex portion 4a, and the valve of the repair valve 3 The dimension (for example, 15 mm-20 mm) which the body 3C and the upper end part of the rust prevention bush 8 do not interfere is set.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust preventive bushing 8 is plastically deformed in a concavo-convex shape along the concavo-convex portion 4A of the locking body 4, and the annular concave portion 8b and the annular portion of the bulged deformed portion 8A which is bulged and deformed are maintained. By engaging the convex portion 8a with the annular concave portion 4b and the annular convex portion 4a constituting the concave and convex portion 4A of the locking body 4, the rust preventive bush 8 is in the state in which the relative movement in the branch axis X direction is impossible. It is fixedly mounted at a predetermined position in the tube portion 2.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fourth Embodiment]
16 and 17 show another embodiment of the anticorrosion structure of the fluid pipe, and a branch pipe as an upstream side pipe portion integrally formed and protruded in the middle of a water pipe 1 made of cast iron pipe which is an example of the fluid pipe One convex part (engagement part) which protrudes toward the flow path side between the joint surfaces of the connection flange part 2A of the part 2 and the upstream connection flange part 3A of the repair valve 3 which is an example of a fluid device or piping material An annular locking body 4 made of metal (for example, made of stainless steel) provided with 4a as an inner peripheral surface 4f is provided, and both side surfaces of the locking body 4 and the coupling flange portions 2A and 3A are opposed to each other. A sheet packing 5, which is an example of a sealing material, is mounted between the surfaces, and the connection flange portion 2 </ b> A of the branch pipe portion 2 and the upstream connection flange portion 3 </ b> A of the repair valve 3 are composed of a plurality of sets of bolts 6 </ b> A and nuts 6 </ b> B. The fastener 6 is tightly connected so as to be detachable in a sealed state. .

  The convex portion 4 a of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the convex portion 4 a is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the repair valve 3. It is comprised smaller than the internal diameter of the internal peripheral surface 3a in a connection pipe part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state of being plastically deformed into a concave shape along the convex portion 4a of the locking body 4, and the annular concave portion 8b of the bulging deformed deformation portion 8A is the aforementioned engagement. By engaging with the convex portion 4a of the stationary body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fifth Embodiment]
FIG. 18 and FIG. 19 show another embodiment of the anticorrosion structure of the fluid pipe, and a branch pipe as an upstream side pipe portion integrally formed in the middle of a water pipe 1 made of cast iron pipe, which is an example of a fluid pipe. One recess (engagement portion) 4b that opens toward the flow path side between the joint surfaces of the connection flange portion 2A of the portion 2 and the upstream connection flange portion 3A of the repair valve 3 that is an example of a fluid device or piping material. Is provided on the inner peripheral surface 4f of an annular locking body 4 made of metal (for example, stainless steel or the like) and between the both side surfaces of the locking body 4 and the connecting flange portions 2A and 3A. A sheet packing 5 as an example of a sealing material is mounted between the opposing surfaces, and the connection flange portion 2A of the branch pipe portion 2 and the upstream connection flange portion 3A of the repair valve 3 are connected from a plurality of sets of bolts 6A and nuts 6B. The fastening device 6 is tightly connected so as to be detachable in a sealed state. That.

  The recess 4 b of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the recess 4 b is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the connection pipe of the repair valve 3. The inner diameter of the inner circumferential surface 4f of the locking body 4 is set to be larger than the inner diameter of the inner circumferential surface 2a of the branch pipe portion 2 and the connecting pipe of the repair valve 3. It is comprised by the same diameter as the internal diameter of the internal peripheral surface 3a in a part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state in which it is plastically deformed in a convex shape along the concave portion 4b of the locking body 4, and the annular convex portion 8a of the bulging deformed portion 8A that is bulged and deformed is By engaging with the annular recess 4 b of the locking body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[ First Reference Example ]
In the fifth embodiment described above, one recess 4b that opens toward the flow path side is formed on the inner peripheral surface 4f of the locking body 4. However, as shown in FIGS. 4 is configured to have a larger inner diameter than the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the inner diameter of the inner peripheral surface 3 a of the connection pipe portion of the repair valve 3. One annular recess 4b that opens toward the flow path side may be formed by the inner peripheral surface 4f of this, the inner peripheral surface 2a of the branch pipe portion 2, and the inner peripheral surface 3a of the connection pipe portion of the repair valve 3.

  The locking body 4 is an interval forming body for revealing one concave portion 4b that opens toward the flow path side, and directly with the annular convex portion 8a of the bulging deformation portion 8A of the rust prevention bush 8. Is not engaged, but forms a step for engaging with the annular convex portion 8a.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust preventive bush 8 is maintained in a state of being plastically deformed in a convex shape along the annular recess 4b appearing in the locking body 4, and the bulging deformed portion 8A thus bulged and deformed is maintained. When the annular convex portion 8a engages with the annular concave portion 4b, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 5th Embodiment, the same number is attached to the same component location as 5th Embodiment, and the description is abbreviate | omitted.

[ Sixth Embodiment]
FIG. 22 and FIG. 23 show another embodiment of the anticorrosion structure of the fluid pipe, and a branch pipe as an upstream pipe portion integrally formed in the middle of a water pipe 1 made of cast iron pipe, which is an example of a fluid pipe. Of the joint surfaces between the connection flange portion 2A of the part 2 and the upstream connection flange portion 3A of the repair valve 3 which is an example of a fluid device or piping material, the joint surface of the upstream connection flange portion 3A of the repair valve 3 is A mounting groove 27 that opens toward the joint surface of the connecting flange portion 2A of the branch pipe portion 2 and the flow channel side is formed, and one convex portion (engagement portion) that protrudes toward the flow channel side is formed in the mounting groove 27. An annular locking body 4 made of metal (for example, made of stainless steel or the like) provided with 4a as an inner peripheral surface 4f is provided, and the connection flange portions 2A and 3A facing one side of the locking body 4 are provided. A sheet packing 5 as an example of a sealing material is mounted between the opposing surfaces, The connecting flange portion 2A of the branch pipe portion 2 and the upstream side connecting flange portion 3A of the repair valve 3 are tightened and connected so as to be detachable in a sealed state by a fastener 6 comprising a plurality of sets of bolts 6A and nuts 6B. .

  The convex portion 4 a of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the convex portion 4 a is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the repair valve 3. It is comprised smaller than the internal diameter of the internal peripheral surface 3a in a connection pipe part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state of being plastically deformed into a concave shape along the convex portion 4a of the locking body 4, and the annular concave portion 8b of the bulging deformed deformation portion 8A is the aforementioned engagement. By engaging with the convex portion 4a of the stationary body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

In the sixth embodiment, the mounting groove 27 for attaching the locking body 4 is formed on the joint surface of the upstream connecting flange portion 3A of the repair valve 3. You may form in the joint surface of 2 A of connection flange parts of the pipe part 2, and both the joint surface of 3 A of upstream connection flange parts of the said repair valve 3, and the joint surface of 2 A of connection flange parts of the branch pipe part 2 You may form over.

[ Seventh Embodiment]
24 and 25 show another embodiment of the fluid pipe anticorrosion structure described in the sixth embodiment, and the convex portion 4a of the locking body 4 and the inner peripheral surface 3a of the connecting pipe portion of the repair valve 3; In order to repair the lining layer peeled off by the cutting of the mounting groove 27, a cylindrical anticorrosion core 28 made of stainless steel or the like having excellent corrosion resistance is expanded and deformed so as to be covered and attached in a close contact state.
The other structure is the same as the configuration described in the sixth embodiment, the same configuration portions, which description given where the sixth embodiment and the same numerals are omitted.

[ Eighth Embodiment]
FIG. 26 and FIG. 27 show another embodiment of the anticorrosion structure of the fluid pipe, and a branch pipe as an upstream side pipe portion integrally formed in the middle of a water pipe 1 made of cast iron pipe, which is an example of a fluid pipe. One convex part (engagement part) which protrudes toward the flow path side between the joint surfaces of the connection flange part 2A of the part 2 and the upstream connection flange part 3A of the repair valve 3 which is an example of a fluid device or piping material An annular locking body 4 made of metal (for example, stainless steel) provided with 4a as an inner peripheral surface 4f is provided, and the entire periphery of the locking body 4 is opposed to the connecting flange portions 2A and 3A. A plurality of sets of the connecting flange portion 2A of the branch pipe portion 2 and the upstream connecting flange portion 3A of the repair valve 3 are covered with an elastic protective layer 29 that exhibits the same function as an elastic sealing material for sealing between the surfaces. Fastened in a sealed state with a fastener 6 consisting of a bolt 6A and nut 6B. Only it is connected.

  The convex portion 4 a of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the convex portion 4 a is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the repair valve 3. It is comprised smaller than the internal diameter of the internal peripheral surface 3a in a connection pipe part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state of being plastically deformed into a concave shape along the convex portion 4a of the locking body 4, and the annular concave portion 8b of the bulging deformed deformation portion 8A is the aforementioned engagement. By engaging with the convex portion 4a of the stationary body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[ Ninth Embodiment]
28 to 30 show another embodiment of the anticorrosion structure of the fluid pipe, show another embodiment of the anticorrosion structure of the fluid pipe, and are integrally formed in the middle of the water pipe 1 made of cast iron pipe, which is an example of the fluid pipe. Between the connecting flange portion 2A of the branch pipe portion 2 as the protruding upstream pipe portion and the upstream connection flange portion 3A of the repair valve 3 which is an example of a fluid device or a piping material, it faces toward the flow path side. An annular locking body 4 made of a metal (for example, stainless steel, etc.) provided with one protruding portion (engagement portion) 4a protruding as an inner peripheral surface 4f, and the coupling flange portions 2A and 3A are opposed to each other A seat packing 5 which is an example of a sealing material for sealing between the surfaces is provided, the engaging body 4 and the seat packing 5 are integrally joined, and the connecting flange portion 2A of the branch pipe portion 2 and the repair valve 3 upstream connection flange portion 3A, a plurality of sets of bolts It is tightened linked detachably sealingly at the fastener 6 consisting of A · nut 6B.

  The convex portion 4 a of the locking body 4 is formed in an annular shape that is continuous in the circumferential direction, and the inner diameter of the convex portion 4 a is the inner diameter of the inner peripheral surface 2 a of the branch pipe portion 2 and the repair valve 3. It is comprised smaller than the internal diameter of the internal peripheral surface 3a in a connection pipe part.

Next, when the diameter expansion operation nut 15 is rotated to the diameter expansion side with the rust prevention bush 8 inserted at a predetermined position in the branch pipe portion 2, the inner feed shaft 11 is moved with respect to the outer feed shaft 12. The elastic member 25 for expanding the diameter made of synthetic rubber is compressed from the direction of the branch axis X and bulged and deformed outward in the radial direction along with the relative movement of the receiving member 23 and the pressing member 24 accompanying the pulling up. The upper portion of the rust prevention bush 8 is maintained in a state of being plastically deformed into a concave shape along the convex portion 4a of the locking body 4, and the annular concave portion 8b of the bulging deformed deformation portion 8A is the aforementioned engagement. By engaging with the convex portion 4a of the stationary body 4, the rust preventive bush 8 is fixedly mounted at a predetermined position in the branch pipe portion 2 in a state in which the rust preventive bush 8 is not relatively movable in the branch axis X direction.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[ Tenth embodiment]
In the ninth embodiment, the locking body 4 is formed in a flat plate shape along a plane in the radial direction. However, as shown in FIGS. 31 to 33, the inner diameter side portion 4 g of the locking body 4 is replaced with a repair valve. 3 is bent at a right angle along the inner peripheral surface 3a of the connecting pipe portion 3 or the inner peripheral surface 2a of the branch pipe portion 2, and one convex portion protruding toward the flow path side with the bent inner diameter side portion 4g ( (Engagement part) 4a may be constituted.
The other structure is the same as the configuration described in the ninth embodiment, the same configuration portions and that of described given the same numbers in the ninth embodiment will be omitted.

[Other Embodiments ]

( 1 ) In each of the above-described embodiments, the branch pipe part 2 as an upstream pipe part integrally formed and protruded in the middle of a cast iron pipe water pipe 1 which is an example of the fluid pipe will be described as an example. However, it may be a branch pipe portion of a branch joint that is sheathed on the fluid pipe 1.

( 2 ) In each of the above-described embodiments, the convex portion 4a that protrudes toward the flow path side between the joint surfaces of the connecting flange portion 2A of the branch pipe portion 2 of the fluid pipe 1 and the connecting flange portion 3A of the repair valve 3. Alternatively, the engaging body 4 provided with the recess 4b that opens toward the flow path side or both the uneven portions 4A is provided, and the engaging body 4 is connected to the branch pipe portion 2 and the repair valve 3. You may provide between the joint surfaces of a connection flange part.

The present invention provides an anticorrosion structure and a locking body used in an anticorrosion method capable of advantageously performing anticorrosion treatment on a specified region in a fluid pipe in terms of cost and construction.

1 Fluid pipe (water pipe)
2 Pipe part (branch pipe part)
2A Connection flange part 2a Inner peripheral surface 3 Pipe part (repair valve)
3A Connecting flange part 3a Inner peripheral surface 4 Locking body 4A Concave and convex part 4a Convex part 4b Concave part 5 Sealing material (O-ring, sheet packing)
8 Antirust bushing 8A bulging deformation part

Claims (10)

  At the pipe part constituting the flow path or at the connection portion of the pipe part, a convex part protruding toward the flow path side or a concave part opening toward the flow path side or both concave and convex parts are provided. Among the rust prevention bushes inserted at predetermined positions in the pipe with a part of the outer peripheral surface facing each other, a bulge that is bulged and deformed radially outward at a portion corresponding to the convex portion, the concave portion, or the concave and convex portion. An anticorrosion structure for a fluid pipe in which a protruding deformation portion is engaged with the convex portion, the concave portion, or the concave and convex portion so as not to be relatively movable in the tube axis direction.   Between the joint surfaces of the connecting flange portions of both the flange-joined pipe portions, a convex portion projecting toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions are provided, or the concave portion appears. A locking body is provided, and among the rust prevention bushes inserted at predetermined positions in the pipe in a state where a part of the outer peripheral surface faces the locking body, radially outward at a portion corresponding to the locking body. An anticorrosion structure for fluid piping, wherein a bulging deformed portion that is bulged and deformed is engaged with the convex portion, the concave portion, or the concave and convex portion so as not to move relative to each other in the tube axis direction.   The anticorrosion structure for fluid piping according to claim 1 or 2, wherein the convex portion, the concave portion, or the concave-convex portion is formed in an annular shape that is continuous in a circumferential direction.   The anticorrosion structure for fluid piping according to claim 1 or 2, wherein the convex portion, the concave portion, or the concave-convex portion is formed intermittently in the circumferential direction.   The anticorrosion structure for a fluid pipe according to claim 2, wherein the locking body is clamped and fixed between the joint surfaces of the connecting flange portions of both pipe portions via a sealing material.   The anticorrosion structure for fluid piping according to claim 2 or 5, wherein the locking body is fitted and held in a groove formed on at least one of the joint surfaces of the connecting flange portions of the two pipe portions.   The anticorrosion structure for fluid piping according to any one of claims 2, 5, and 6, wherein the locking body is joined to a sealing material that seals between joint surfaces of the connecting flange portions of the two pipe portions.   The fluid piping according to any one of claims 2, 5, 6, and 7, wherein the locking body is formed in an annular shape, and the convex portion, the concave portion, or the concave-convex portion is integrally formed on an inner peripheral surface thereof. Anti-corrosion structure. An anticorrosion method for fluid piping in which a rust-proof bushing is attached to a part of at least one inner peripheral surface of both flange-joined pipe parts,
Between the joint surfaces of the connecting flange portions of the two pipe portions, there is provided a convex portion protruding toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions, or a locking body that exposes the concave portion. Among the rust preventive bushes inserted at predetermined positions in the pipe in a state where a part of the outer peripheral surface faces the engaging body, a part of the rust preventing bush corresponding to the engaging body is a bush diameter expanding machine. And a bulging deformation portion of the antirust bushing is engaged with the convex portion, the concave portion or the concave and convex portion so as not to be relatively movable in the tube axis direction. Anticorrosion method for piping.   Between the joint surface of the branch pipe part of the fluid pipe or the branch pipe part of the branch joint sheathed on the fluid pipe and the joint flange part of the repair valve connected thereto, or the connection flange part of the branch pipe part Between the joint surface of the connecting pipe connected to the connecting flange portion, a convex portion protruding toward the flow channel side, a concave portion opening toward the flow channel side, or both concave and convex portions are provided, or the concave portion appears. A part of the rust prevention bush corresponding to the engagement body is provided among the rust prevention bushes inserted at a predetermined position in the pipe with a part of the outer peripheral surface facing the engagement body. A bulging deformation of the rust-proof bushing is caused to bulge and deform outward in the radial direction by a bush enlarger, and the bulging deformation portion of the rust prevention bush is engaged with the convex portion, the concave portion or the concave and convex portion so as not to be relatively movable in the tube axis direction. Characteristic anti-corrosion method for fluid piping.

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