JP2009127834A - Rust preventing means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rust preventing means which does not occupy a space outside casings. <P>SOLUTION: The rust preventing means uses an upper casing 11 and a lower casing 12 for encircling a pipe end face 1d of a fluid pipe 1 whose metal element material 1a is exposed directly to fluid therein and applies rust preventing treatment to the pipe end face 1d. The rust preventing means comprises a rust preventing tool 2 formed of metal having a greater ionizing tendency than metal of which the fluid pipe 1 is formed. The rust preventing tool 2 is arranged in the upper casing 11 and the lower casing 12 along the outer periphery of the fluid pipe 1 so as to be electrically conductive to the fluid pipe 1. Thus, the rust preventing tool 2 having a greater ionizing tendency than the fluid pipe 1 is not exposed outside the upper casing 11 and the lower casing 12 and so the rust preventing tool 2 does not occupy a space outside the upper casing 11 and the lower casing 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rust prevention means that surrounds a metal exposed portion where a metal material of a metal fluid pipe is directly exposed to the fluid with a housing and performs a rust preventive treatment on the metal exposed portion.

  A pipe cutting means is connected to the opening provided in the upper surface of the casing surrounding the outer peripheral surface of the water pipe, and the water pipe in the casing is cut without stopping the water flow. Are controlled in the water by blocking the flow of water from one water pipe to the other water pipe cut by moving the water control body in the radial direction. It is common.

  In such a continuous water construction method, since it is impossible to perform a rust prevention treatment such as painting on the metal base of the opening exposed by cutting, it is usual to leave the opening cut. However, if the water pipe is cut as described above, the metal substrate is exposed at the opening of the water pipe, and if installed as it is, there is a problem that the water pipe opening corrodes due to the water flowing through the water pipe. It was.

  Therefore, as a solution to such a problem, the conductive wire connected to the metal lump having a larger ionization tendency than the metal constituting the water pipe, abutting in a state where the coating film outside the water pipe is peeled off, By connecting to the concealing cap of the fixing bolt attached to the housing, a dissimilar metal battery with the metal lump as the anode and the opening of the water pipe as the cathode is formed, and by depleting the metal lump, Some of the openings are rust-proof. (For example, refer to Patent Document 1).

JP-A-11-108287 (second page, FIG. 2)

  However, in Patent Document 1, since the metal lump is disposed outside the casing via the conductive wire, it is necessary to secure a space where the metal lump can be installed outside the casing. Had the problem of taking up space.

  The present invention has been made paying attention to such problems, and an object thereof is to provide a rust prevention means that does not take up space outside the casing.

In order to solve the above problems, the rust preventive means according to claim 1 of the present invention is:
A metal exposed portion in which the metal material of the metal fluid pipe is directly exposed in the fluid is surrounded by a housing, and is a rust preventing means for performing a rust preventive treatment on the metal exposed portion,
The rust prevention means includes a metal lump made of a metal having a larger ionization tendency than the metal constituting the metal fluid pipe,
The metal lump is arranged along the outer periphery of the metal fluid pipe in the housing so as to be electrically connected to the metal fluid pipe.
According to this feature, the metal lump is arranged along the outer periphery of the metal fluid pipe in the housing so that the metal lump having a larger ionization tendency than the metal fluid pipe is electrically connected to the metal fluid pipe. Is not exposed to the outside of the casing, so that the metal lump does not take up space outside the casing, and it is possible to prevent rust from occurring on the exposed metal portion. Furthermore, since it is not necessary to provide a special conductive component for electrically connecting the metal mass to the metal fluid pipe, the number of components can be reduced.

The rust prevention means according to claim 2 of the present invention is the rust prevention means according to claim 1,
The housing comprises a plurality of divided housings each fixed by a fixing means,
The metal lump is disposed between the inner peripheral surface of the divided housing and the outer peripheral surface of the metal fluid pipe, and maintains a contact state with the outer peripheral surface of the metal fluid pipe by the fixing means. It is characterized by that.
According to this feature, the contact state between the metal lump and the metal fluid pipe can be maintained by utilizing the fact that the plurality of divided housings are fixed by the fixing means, and the metal lump and the metal fluid can be maintained. A conduction state with the tube can be ensured.

The rust preventive means according to claim 3 of the present invention is the rust preventive means according to claim 2,
The metal fluid pipe has a coating layer for anticorrosion formed on the outer peripheral surface of a metal material,
An inner peripheral pointed portion having a pointed shape toward the outer peripheral surface of the metal material is formed on the inner peripheral surface of the metal block.
According to this feature, by using the fixing means to fix the plurality of divided housings, the inner peripheral pointed portion of the metal lump enters the coating layer while peeling off the coating layer and contacts the outer peripheral surface of the metal material. Since it can contact, the metal lump can be easily conducted with the metal fluid pipe by fixing the divided casings.

The rust preventive means according to claim 4 of the present invention is the rust preventive means according to claim 2,
The metal fluid pipe has an anticorrosive coating layer formed on the outer peripheral surface of the metal material,
By exposing at least a part of the coating layer, an exposed portion where the metal material is exposed is formed,
The metal lump has a contact portion that contacts the exposed portion.
According to this feature, the abutting part of the metal lump abuts on the exposed part formed by peeling the coating film layer by using a fixing means to fix the plurality of divided housings to each other. Since the lump and the metal material come into contact with each other, the metal lump can be easily connected to the metal fluid pipe by fixing the divided casings.

The rust prevention means according to claim 5 of the present invention is the rust prevention means according to any one of claims 2 to 4,
The metal lump is made of a metal having a higher ionization tendency than the housing,
An outer peripheral pointed portion having a pointed shape toward the inner peripheral surface of the divided housing is formed on the outer peripheral surface of the metal block.
According to this feature, since the metal lump has a higher ionization tendency than the divided housing, the rust preventive effect can be given to the housing in addition to the exposed metal portion of the metal fluid pipe. In addition, since the outer peripheral pointed portion of the metal lump can be brought into contact with the inner peripheral surface of the divided casing by using the fixing means to fix the plurality of divided casings to each other, The lump can be easily conducted with the housing.

The rust prevention means according to claim 6 of the present invention is the rust prevention means according to any one of claims 1 to 5,
The metal lump is maintained in contact with the outer peripheral surface of the metal fluid pipe by a fixture made of a conductive member having an insertion portion inserted from the outer peripheral surface of the metal lump to the metal material. It is characterized by being.
According to this feature, even when the coating layer is formed on the outer peripheral surface of the metal fluid pipe by utilizing the fact that the metal lump and the metal fluid pipe are fixed by the fixture, the insertion portion Is inserted from the outer peripheral surface of the metal mass to the metal material, so that the metal mass and the metal material can be electrically connected via the insertion portion, and the metal mass and the metal fluid pipe are electrically connected. A state can be secured.

The rust preventive means according to claim 7 of the present invention is the rust preventive means according to any one of claims 1 to 6,
A pair of metal exposed portions of the metal fluid pipe are arranged in a state separated in the axial direction in the housing,
The metal mass is arranged along the outer periphery of each separated metal fluid pipe.
According to this feature, even when the separated metal fluid pipes are not electrically connected to each other, the metal lumps are arranged in the respective metal fluid pipes. It is possible to prevent rust on the exposed metal parts formed on the fluid-made pipe.

The rust prevention means according to claim 8 of the present invention is the rust prevention means according to any one of claims 1 to 7,
In the housing, at least a part of the metal fluid pipe is excised, and a water control body for controlling the fluid is installed,
The water control body is characterized in that a second metal block is provided so as to be electrically connected to the metal fluid pipe.
According to this feature, even if at least a part of the metal fluid pipe is cut and the space in which the metal lump can be placed in the metal fluid pipe is reduced in the casing, the water control body arranged in the casing is used. Since the second metal mass is provided on the water control body, the rust preventive effect of the exposed metal portion is continued by the second metal mass in addition to the metal mass arranged on the outer peripheral surface of the metallic fluid pipe. be able to.

  Examples of the present invention will be described below.

  An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is an upper side view showing a state in which a rust preventive tool according to an embodiment of the present invention is attached to a fluid pipe, and FIG. FIG. 3 is an end view showing a process of attaching the upper housing and the lower housing, FIG. 3 is a cross-sectional view showing a state where the upper housing and the lower housing are attached to the fluid pipe, and FIG. ) Is a schematic view showing a perforating apparatus for cutting a fluid pipe, (b) is a schematic view showing a connection state between the perforating apparatus and the fluid pipe, and FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5, and FIG. 7 is an enlarged cross-sectional view showing B of FIG. 5. In the following description, the left and right sides of FIG. 3 are the left and right sides of the fluid pipe, and the upper and lower sides of FIG. 2 are the upper and lower sides of the fluid pipe.

  As shown in FIGS. 1 and 7, the water control device 20 (see FIG. 5) is mainly disposed in a metal fluid pipe 1 (hereinafter simply referred to as a fluid pipe) through which fluid flows, and the fluid pipe 1. The water control part 22 (refer FIG. 5) which controls the flow of the fluid consists of. The fluid pipe 1 is buried in soil, and the coating layers 1b and 1c are coated on the inner and outer peripheral surfaces of a metal material 1a made of ductile cast iron containing iron (Fe) and carbon with an anticorrosion paint or the like. Are formed respectively. In the present embodiment, the coating layer 1b on the inner peripheral surface side of the metal material 1a, which is desired to have a high rust prevention effect because the fluid flows in the fluid pipe 1, is applied to the outer peripheral surface of the metal material 1a. It is formed thicker than the layer 1c.

  As shown in FIG. 1, the outer periphery of the fluid pipe 1 is made of aluminum as a metal lump, which is a metal having a higher ionization tendency than the metal material 1 a of the fluid pipe 1, and rust is generated in the fluid pipe 1. Two rust prevention tools 2 and 2 as rust prevention means for preventing are provided on the left and right along the circumferential direction. More specifically, the rust preventive tools 2 and 2 are provided at two places sandwiching a cut place C of the fluid pipe 1 to be described later in the pipe axis direction. Further, as shown in FIG. 7, one inner peripheral pointed portion 2 a that is pointed toward the tube axis of the fluid pipe 1 is formed on the inner peripheral surface of the rust preventive tool 2. In addition, the inner peripheral pointed portion 2a is not limited to a single line, and may be formed in a plurality of lines along the circumferential direction on the inner peripheral surface of the rust preventive tool 2. It may be formed in a shape.

  Specifically, as shown in FIG. 2, the rust preventive tool 2 is formed in a halved shape that is vertically divided into two with respect to the fluid pipe 1. First, the upper half rust preventive tool 2 is connected to the fluid pipe. It arrange | positions along the circumferential direction in the 1st outer peripheral surface upper half part. And the upper housing | casing 11 as a division | segmentation housing | casing which comprises the housing | casing formed with the casting containing iron (Fe), and the lower as a division | segmentation housing | casing which has arrange | positioned the lower half-rust prevention tool 2 to the internal peripheral surface By coating the casing 12 on the outer periphery of the fluid pipe 1, the rust preventers 2, 2 are disposed between the inner peripheral surfaces of the upper casing 11 and the lower casing 12 and the outer peripheral surface of the fluid pipe 1. Will be.

  Further, bolts 47 and 47 are inserted into bolt holes 43, 43, 44 and 44 formed coaxially with the flange portions 41 and 42 facing each other of the upper housing 11 and the lower housing 12, so that the flange portions 41 and 42 are inserted. Are fastened with bolts 47 and 47 and nuts 48 and 48, and by these fixing means, the pair of rust prevention tools 2 and 2 are connected to the fluid pipe 1 by the inner peripheral surface of the upper housing 11 and the inner peripheral surface of the lower housing 12. As shown in FIG. 7, the inner peripheral pointed portion 2a of the rust preventive tool 2 peels off the coating layer 1c and enters the metal material 1a and bites into the metal material 1a as shown in FIG. Thus, the rust preventive tool 2 is in electrical contact with the metal material 1a.

  As a result, as shown in FIGS. 2 and 3, a pair of rust preventive tools 2, 2 in a halved state are arranged along the outer circumferential direction of the fluid pipe 1, and the upper casing 11 and the lower casing 12 are covered. The Therefore, since the contact state between the fluid pipe 1 and the rust preventive tool 2 is maintained, the conduction state between the rust preventive tool 2 and the fluid pipe 1 can be ensured. Further, the inner peripheral pointed portion 2a protrudes leftward in the direction of the central axis of the tube (see FIG. 7), but may protrude toward the right or in a direction orthogonal to the tube axis. It may be protruding.

  A packing 49 is fitted in packing grooves formed on the left and right end portions of the flange portion 41 of the upper housing 11 so as to extend from left to right, and the opposing flange portions 41 and 42 are connected to bolts 47 and 47 and nuts 48 and 48. By tightening with 48, the water flowing through the fluid pipe 1 is prevented from leaking from the divided housing composed of the upper housing 11 and the lower housing 12.

  As shown in FIG. 3, after the upper housing 11 and the lower housing 12 are attached to the fluid pipe 1, the inner surfaces of the left and right ends of the upper housing 11 and the lower housing 12 are circumferentially arranged. Annular seal members 46 formed along the circumferential direction are respectively fitted in the seal grooves 45 formed along the circumferential direction, and are formed along the circumferential direction in the left and right directions of the upper housing 11 and the lower housing 12, respectively. When the seal member 46 is pressed toward the upper housing 11 and the lower housing 12 by the annular push ring 50, the space between the upper housing 11 and the lower housing 12 and the fluid pipe 1 is sealed in a watertight manner.

  In this embodiment, the pusher wheel 50 is formed with a flange portion 51 bulging in the radial direction in the circumferential direction, and bolt holes 52 penetrating in the tube axis direction at predetermined intervals. . The upper housing 11 is formed with a flange portion 53 that bulges in the radial direction and is formed at the left and right end portions along the circumferential direction, and an attachment hole 54 is formed in the flange portion 53. Similarly, the lower housing 12 also has a flange portion 55 that bulges in the radial direction and is formed along the circumferential direction at each of the left and right ends, and an attachment hole is formed in the flange portion 55. Has been. The bolt holes 52 of the flange portion 51 are coaxial with the mounting holes 54 of the flange portion 53 of the upper housing 11 and the flange portions 55 of the lower housing 12. By inserting the nut 56 and attaching the push ring 50 to the upper casing 11 and the lower casing 12, the seal member 46 is pressed, and the upper casing 11, the lower casing 12 and the fluid pipe 1 are sealed. Secured.

  Furthermore, in the present embodiment, the pusher wheel 50 includes a plurality of bolt holes 57 formed on the outer peripheral surface of the fluid pipe 1 at predetermined intervals in the circumferential direction, and a direction perpendicular to the pipe axis from the outside of the fluid pipe 1. A push bolt 58 screwed into the bolt hole 57, and a plurality of circular arc grooves 59 formed at predetermined intervals in the circumferential direction on the inner peripheral surface in the vicinity of the outer end of the fluid pipe 1. And a plurality of fixed claws 60 disposed in the arc groove 59 and having a sharp blade at the tip thereof. The push bolt 58 is screwed from the outside of the arc groove 59, and the fixed claws 60 are fluidized. By pressing against the outer peripheral surface of the tube 1 and pressing the sharp blade of the fixed claw 60 toward the tube axis to bite into the outer peripheral surface of the fluid tube 1, the relative movement between the pusher wheel 50 and the fluid tube 1 is regulated. It has become.

  Next, cutting of the cut portion C of the fluid pipe 1 in the upper housing 11 and the lower housing 12 will be described.

  As described above, after the divided casing composed of the upper casing 11 and the lower casing 12 is attached to the fluid pipe 1 and the rust preventive tool 2, the fluid pipe 1 is perforated as shown in FIG. A piercing device 34 having a piercing cutter 32 to be moved, a stroke 33 for moving forward and backward, and a body 31 for accommodating the piercing cutter 32 therein is provided on the upper opening U (see FIG. 3) side of the housing 11. As shown in FIG. 4B, it is fixedly connected to the housing of the attached on-off valve 30. At this time, the central axis of the cylindrical piercing cutter 32 is substantially vertically oriented and is disposed at a position intersecting the central axis of the fluid pipe 1 in a substantially orthogonal direction so as to be watertight above the on-off valve 30. Connect to communication.

  Next, the on-off valve 30 is opened, and the punching blade 32 a of the punching cutter 32 is rotated so as to pass through the entire cross section of the fluid pipe 1, and the punching cutter 32 is moved downward by the stroke 33. By rotating and lowering the piercing cutter 32, the fluid pipe 1 is gradually cut downward from the outer peripheral surface of the upper surface of the fluid pipe 1 at two cut surfaces between the diameters of the lower end periphery of the piercing cutter 32. At the point where the perforating blade 32a is lowered so as to pass through the entire cross section of the fluid pipe 1, it is divided into the fluid pipe 1 and the fluid pipe cut piece 1 ′ at two cut surfaces. Further, as shown in FIG. 6, the tube end surface 1 d which is the cut surface of the fluid tube 1 is formed in an arc shape in plan view by cutting with the perforating cutter 32.

  In the above-described cutting operation of the fluid pipe 1, the fluid pipe 1 is in an indefinite water state. Therefore, the fluid pipe 1 is in a full state with water pressure applied. In the cutting operation by the piercing cutter 32, the center drill 32 b is a fluid pipe. 1 When the inside of the fluid pipe 1 reaches the inside of the fluid pipe 1 from the outer peripheral surface of the upper surface, the fluid inside the fluid pipe 1 leaks out of the pipe, and the fuselage is connected in communication with the inner space of the upper housing 11 and the lower housing 12 and above. 31 will be filled. However, as shown in FIG. 3, the upper casing 11 and the lower casing 12 and the fluid pipe 1 are connected in a watertight manner, so that fluid leaked from the inside of the fluid pipe 1 is 11 and the lower casing 12 and the fluid pipe 1 are not leaked outside. Therefore, the cutting operation can be performed while the fluid in the fluid pipe 1 remains in an undisrupted water state.

  Then, after the cutting operation of the fluid pipe 1, the drilling cutter 32 disposed inside the body 31 and the cut fluid pipe cutting piece 1 ′ hooked on the hooking piece 32 c of the center drill 32 b are carried out to the outside. To do.

  As a result of the cutting, the fluid pipes 1 and 1 separated in the axial direction in the upper casing 11 and the lower casing 12 are naturally not electrically connected to each other. A pipe end surface 1d as a metal exposed portion where the metal material 1a is exposed is formed on each of the divided sections. The piping path of the fluid pipe 1 becomes a piping path through the upper casing 11 and the lower casing 12, that is, the pipe end face 1d is directly exposed to the fluid in the fluid pipe 1.

  Then, after finishing the cutting operation of the fluid pipe 1, the perforating device 34 and the on-off valve 30 are retracted, and the water control unit 22 as a water control body is inserted into the upper opening U as shown in FIGS. Arrange.

  The water control part 22 is made of a casting containing iron (Fe), and is connected to the pipe part 29 a serving as a fluid pipe line and the pipe part 29 a, and the horizontal direction between the water control part 22 and the upper housing 11. The valve housing 29 includes a restricting portion 29b that restricts relative movement of the water and a continuous upper portion 29c that is connected to the restricting portion 29b and forms the upper portion of the water control portion 22. A valve body 26 that is moved up and down by the rotation of the rotation screw 24 is provided inside the body 29. When the valve housing 29 is inserted into the upper opening U of the upper housing 11 and disposed, the seal member 61 disposed in the housing groove 62 formed on the outer periphery of the conduit portion 29a and the outer periphery of the conduit portion 29a. While maintaining the water tightness with the inner peripheral surface of the lower housing 12, the outer peripheral surface of the restricting portion 29b and the upper housing are respectively provided by two sets of seal members 63 and 64 arranged vertically on the outer periphery of the restricting portion 29b. The watertightness with 11 inner peripheral surfaces is ensured.

  A step groove 29d is formed on the outer periphery of the upper surface of the restricting portion 29b, and the support plate is in contact with the step groove 29d and the upper surface of the flange portion 65 formed on the upper portion of the upper housing 11. 27 is provided, mounting holes 67 are formed in the support plate 27 so as to be coaxial with the bolt holes 66 formed in the flange portion 65, and bolts and nuts 68 are attached corresponding to the bolt holes 66 and the mounting holes 67. As a result, the valve housing 29 can be prevented from coming out of the upper housing 11.

  A valve lid 23 and a holding plate 21 are formed above the continuous upper portion 29c. The upper surface of the continuous upper portion 29c is in contact with the bottom surface of the valve lid 23, and is fastened to the valve lid 23 with bolts, nuts, etc. The moving screw 24 penetrates the valve lid 23 in a rotatable and watertight manner, and an upper end portion thereof protrudes above the valve lid 23.

  The holding plate 21 is fixed to the upper end surface of the valve lid 23 with a bolt and prevents the rotation screw 24 from being pulled out. The screw portion 24b is a screw portion whose peripheral surface is screwed over substantially the entire length except for the upper end portion of the rotating screw 24, and the screw top 25 that is prevented from rotating and is movable in the vertical direction. When the turning operation portion 24a formed on the upper end portion of the turning screw 24 is turned, the screw portion 24b is rotated in accordance with the turning operation portion 24a. The valve body 26 attached integrally can move up and down in the fluid pipe 1.

  With the above configuration, the water control unit 22 functions as the valve body 26 moves up and down. That is, the pipeline is opened by moving the valve body 26 upward, and the pipeline is blocked by moving downward.

  As shown in FIG. 5, in the present embodiment, in the state where the water control unit 22 is functioning, the divided fluid pipes 1 and 1 are divided in the upper housing 11 and the lower housing 12 constituting the divided housing. 1 end face 1d of the tube 1 is exposed in the fluid. The material of the tube end surface 1d is a metal material 1a containing iron (Fe), and the material of the rust preventive tool 2 is aluminum (Al), which has a higher ionization tendency than iron (Fe), and the tube end surface 1d and the rust preventive device. Since the tool 2 is in electrical conduction with the outer peripheral surface of the fluid tube 1, a dissimilar metal battery is formed in which the fluid is an electrolyte solution, the rust preventive tool 2 is an anode, and the tube end surface 1d is a cathode.

  Therefore, a potential difference is generated between the rust preventive tool 2 and the pipe end surface 1d, and the rust preventive tool 2 on the anode side elutes as aluminum ions and elutes as aluminum ions and occurs at the same time with the rust preventive tool 2. Electrons flow toward the tube end surface 1d. As a result, the rust preventive tool 2 is consumed as a sacrificial anode, and the tube end surface 1d is not ionized, so that the metal surface of the tube end surface 1d exposed by cutting can be prevented from being rusted or corroded.

  Moreover, since the rust preventive tool 2 is in contact with the upper casing 11 and the lower casing 12, and the upper casing 11 and the lower casing 12 are formed of a casting made of iron by the rust preventive tool 2, the fluid is A dissimilar metal battery is formed using the electrolyte solution, the rust preventive tool 2 as an anode, and the upper housing 11 and the lower housing 12 as cathodes, and only the rust preventer 2 is consumed as a sacrificial anode. The metal surface of the housing 12 is less rusted or corroded.

  Since these rust prevention effects continue until the rust prevention tool 2 is exhausted, the size, shape, etc. of the rust prevention tool 2 may be appropriately set according to the service life of the fluid pipe 1 and the like.

  As shown in FIG. 5, the rust preventive tools 2, 2 are formed on the pipe end surfaces 1 d, 1 d formed by cutting the fluid pipe 1 with the punching device 34 in the upper casing 11 and the lower casing 12. It is preferable to arrange in the vicinity. By doing so, the electrical resistance is reduced in the state in which the dissimilar metal battery having the rust preventive tool 2 as the anode and the tube end face 1d as the cathode is formed, and the electrons generated from the rust preventers 2 and 2 are transferred to the tube end face 1d. Therefore, the tube end surface 1d is not easily ionized, and the effect of preventing the tube end surface 1d from being rusted or corroded is improved.

  As described above, in the rust preventer 2 of the fluid pipe 1 of the present embodiment, the upper casing 11 so that the rust preventer 2 having a higher ionization tendency than the fluid pipe 1 is electrically connected to the fluid pipe 1. Since the rust preventive tool 2 is not exposed to the outside of the upper casing 11 and the lower casing 12, the rust preventive tool 2 is not exposed to the upper casing. It is possible to prevent rust from being generated on the pipe end surface 1d without taking a place outside the body 11 and the lower housing 12. Furthermore, since it is not necessary to provide a special conductive component that electrically connects the rust preventive tool 2 to the fluid pipe 1, the number of components can be reduced.

  Further, by utilizing the fact that the divided casings of the upper casing 11 and the lower casing 12 are fixed to each other by the fixing means constituted by the flange portions 41 and 42, the bolt holes 43 and 44, the bolt 47 and the nut 48, The contact state between the rust preventive tool 2 and the fluid pipe 1 can be maintained, and the conductive state between the rust preventive tool 2 and the fluid pipe 1 can be ensured.

  Further, the inner peripheral pointed portion 2a of the rust preventive tool 2 is formed by fixing the divided casings of the upper casing 11 and the lower casing 12 by fixing means including a bolt 47 and a nut 48. Since the coating layer 1c can be entered while peeling off and can contact the outer peripheral surface of the metal material 1a, the rust preventer 2 can be easily connected to the fluid pipe by fixing the divided housings of the upper housing 11 and the lower housing 12 to each other. 1 can be conducted.

  Further, even when the separated fluid pipes 1 and 1 are not electrically connected to each other, the rust preventive tool 2 is disposed in each of the fluid pipes 1 and 1, respectively. The pipe end surfaces 1d and 1d formed on the pipes 1 and 1 can be rust-proof, respectively.

  Further, in the present embodiment, the rust preventive tool 2 is arranged along the outer periphery of the fluid pipe 1, but the shape and arrangement of the rust preventive tool 2 can be arbitrarily changed, and the following modified examples 1 to 1 The design may be appropriately changed as shown in FIG. FIG. 8 is an enlarged cross-sectional view showing a state in which the rust preventive tool is attached to the fluid pipe in Modification Example 1. FIG. 9 is a front view showing a state in which the rust preventive tool is attached to the fluid pipe in Modification Example 2. FIG. 10 is a cross-sectional view showing a state in which the upper housing and the lower housing are attached to the fluid pipe, and FIG. 11 shows a state in which a rust preventive tool is attached to the fluid pipe in Modification 3. FIG. 12 is a front view, and FIG. 12 is a cross-sectional view showing a state in which a rust preventive tool is provided in the water control portion in Modification 4. FIG. 13 is an enlarged cross-sectional view showing a state in which the rust preventive tool is attached to the fluid pipe in Modification Example 5. FIG. 14 is an enlarged cross-sectional view showing a state in which the rust preventive tool is attached to the fluid pipe in Modification Example 6. FIG. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 8, in the first modification, the ionization tendency is smaller between the outer peripheral surface of the fluid pipe 1 and the inner peripheral surface of the rust preventer 102 than the rust preventer 102 made of aluminum (Al). A member 103 is disposed, and the interposed member 103 and the rust preventive tool 102 are electrically connected.

  Further, on the outer peripheral surface of the rust preventive tool 102, there are a plurality of outer peripheral pointed portions 102a that are pointed toward the inner peripheral surfaces of the upper housing 11 and the lower housing 12 in the left-right direction (three in this modification). The inner circumferential surface of the interposition member 103 is formed with one inner circumferential pointed portion 103a that is pointed toward the outer circumferential surface of the fluid pipe 1 along the circumferential direction. . Note that the outer peripheral pointed portion 102a is not limited to a plurality of strips, and may be formed on the outer peripheral surface of the rust preventive tool 102 in a single line along the circumferential direction. It may be done. Further, the inner peripheral pointed portion 103a is not limited to a single line, and may be formed in a plurality of lines along the circumferential direction on the inner peripheral surface of the interposed member 103. It may be formed.

  For this reason, when the upper casing 11 and the lower casing 12 are attached to the fluid pipe 1, the interposition member 103 is pressed by the inner peripheral surfaces of the upper casing 11 and the lower casing 12, and the inner peripheral point of the interposition member 103 is When the shape portion 103a peels off the coating layer 1c and bites into the metal material 1a, the metal material 1a comes into contact with the inner peripheral pointed portion 103a, that is, the rust preventer 102 is electrically connected to the fluid pipe 1 via the interposition member 103. Conductive. Further, the outer peripheral pointed portion 102 a of the rust preventive tool 102 bites into the upper casing 11 and the lower casing 12, so that the rust preventive tool 102 comes into contact with the upper casing 11 and the lower casing 12.

  In this case, the rust preventive tool 102 and the pipe end surface 1d are electrically connected via the interposition member 103, and in a state where the water control portion 22 is functioning, the rust preventive tool 102 and the pipe end surface 1d are interposed. The potential difference is generated, and the rust preventive tool 102 on the anode side is eluted as aluminum ions. However, since the interposition member 103 is less ionized than the rust preventive tool 102, the interposition member 103 is not eluted. The inner peripheral cusp portion 103a is not eluted and separated from the metal material 1a, and the rust preventive tool 102 and the pipe end surface 1d are maintained in an electrically conductive state until all of the rust preventive tool 102 is eluted. Therefore, the state in which the dissimilar metal battery is formed can be maintained for a long time.

  In addition, in the state where the water control unit 22 is functioning, the outer peripheral pointed portion 102a of the rust preventive tool 102 is in a state of biting into the inner peripheral surfaces of the upper housing 11 and the lower housing 12, and therefore, for example, unexpected Even when an external force is generated, the contact state between the rust preventive tool 102 and the upper casing 11 and the lower casing 12 is maintained. A conduction state can be ensured.

  By doing in this way, since the rust preventive tool 2 has a higher ionization tendency than the divided casing of the upper casing 11 and the lower casing 12 made of cast iron, in addition to the pipe end surface 1d of the fluid pipe 1, the upper casing 11 and the lower housing 12 can also be given a rust prevention effect. Further, the outer peripheral pointed portion 102a of the rust preventive tool 2 is utilized by fixing the plurality of divided casings of the upper casing 11 and the lower casing 12 by a fixing means including a bolt 47, a nut 48, and the like. Can be brought into contact with the inner peripheral surface of the divided casing, and the rust preventive tool 2 is easily connected to the upper casing 11 and the lower casing 12 by fixing the divided casings of the upper casing 11 and the lower casing 12 to each other. can do.

  An interposition member made of a material having an ionization tendency similar to that of the interposition member 103 may be interposed between the inner peripheral surface of the upper casing 11 and the lower casing 12 and the outer peripheral surface of the rust preventive tool 102. . Furthermore, an interposition member made of a nonconductor may be interposed between the inner peripheral surfaces of the upper housing 11 and the lower housing 12 and the outer peripheral surface of the rust preventive tool 102. By doing in this way, the rust prevention effect by the rust prevention tool 102 can be exerted only on the pipe end surface 1d of the fluid pipe 1, and the duration of the rust prevention effect of the rust prevention tool 102 can be extended.

  In this embodiment, the fluid pipe 1 is divided in the axial direction by the perforating device 34. However, as shown in FIGS. 9 and 10 as a second modification, the fluid pipe 201 includes an upper casing 211 and a lower casing. In 212, a pipe wall of the fluid pipe 201 is drilled at only one upper portion by a drilling device (not shown) and has a drilling surface 201d from which the metal material is exposed. Correspondingly, the rust preventive tool 202 is disposed at a position where the opening 202a that is opened larger than the perforated surface 201d surrounds the periphery of the perforated surface 201d. The pipe 201 is divided into two parts at the top and bottom, and is formed along the circumferential direction of the fluid pipe 201. In addition, a water control unit (not shown) is applied to a divided housing composed of an upper housing 211 and a lower housing 212 covering the fluid pipe 201 and the rust preventive tool 202. As a result, the perforated surface 201d facing the fluid is rust-prevented by the action of the different metal battery.

  Furthermore, as a third modification example, as shown in FIG. 11, a perforation surface 301d where a metal material is exposed by perforation is formed only in the upper part of the fluid pipe when a fluid pipe is perforated at only one upper portion by a perforation device. Therefore, the rust preventive tool 302 is disposed along a part of the outer periphery of the fluid pipe 301 so that the opening 302a that is opened to a larger opening than the perforated surface 301d is disposed only at a position surrounding the vicinity of the perforated surface 301d. It may be formed in a circular arc shape.

  Next, Modification 4 will be described.

  As shown in FIG. 12, rust-proofing pieces 13 and 13 as second metal blocks, which are rust-proofing means made of aluminum, are fixed along the circumferential direction by screws 18 at both ends of a pipe part 29a. Yes. Moreover, the lower end metal pieces 14 and 14 which consist of a conduction | electrical_connection member are attached to the left and right of the lower end surface of the pipe line part 29a, and the rust prevention pieces 13 and 13 and the lower end metal pieces 14 and 14 conduct | electrically_connect, Conductive wire members 15 and 15 made of metal wires whose outer periphery is covered with a covering member are disposed along the outer surface of the lower end of the pipe line portion 29a.

  Further, a terminal portion 17 made of a metal piece is provided at a place where the pipe line portion 29a is installed on the inner bottom surface of the lower housing 12, and the terminal portion 17 and the metal material of the fluid pipe 1 are electrically connected. Conductive wire members 16, 16 made of a metal wire whose outer periphery is covered with a covering member are interposed so as to be electrically connected to each other. And in the state where the water control part 22 with which the pipe line part 29a was comprised was installed in the upper housing | casing 11 and the lower housing | casing 12, the lower end metal piece 14 and the terminal part 17 contact electrically, The metal material of the fluid pipe 1 and the rust prevention piece 13 are electrically connected via the conducting wire member 16, the terminal portion 17, the lower end metallic piece 14, and the conducting wire member 15.

  That is, not only is the dissimilar metal battery formed with the rust preventive tool 2 as the anode and the tube end surface 1d of the metal material 1a as the cathode, but the water control part 22 is installed in the upper casing 11 and the lower casing 12. In this state, a dissimilar metal battery having the rust preventive piece 13 as an anode and the tube end face 1d as a cathode is formed through the conductor members 15, 16 and the like, so that the rust preventer 2 and the rust preventive piece 13 serve as a sacrificial anode. The pipe end face 1d is consumed and is not ionized, and the pipe end face 1d exposed by cutting is rust-proof.

  By doing so, even if a part of the fluid pipe 1 is cut out and the space in which the rust preventive tool 2 can be disposed in the fluid pipe 1 in the upper housing 11 and the lower housing 12 is reduced, the upper housing 11 And since the rust prevention piece 13 is provided in the water control part 22 using the water control part 22 arrange | positioned in the lower housing | casing 12, the rust prevention tool arrange | positioned in the outer peripheral surface of the metallic fluid pipe | tube 1 In addition to 2, the rust prevention piece 13 can continue the rust prevention effect of the pipe end surface 1d.

  As shown in FIG. 12, it is preferable that the tube end faces 1d and 1d and the rust preventive pieces 13 and 13 are close to each other. By doing in this way, in the state in which the dissimilar metal battery having the rust preventive piece 13 as the anode and the tube end face 1d as the cathode is formed, the electric resistance becomes small, and the electrons generated from the rust preventive pieces 13 and 13 become the tube end face 1d. Therefore, the tube end surfaces 1d and 1d are not easily ionized, and the effect of reducing the rusting or corrosion of the tube end surfaces 1d and 1d can be improved.

  Next, Modification 5 will be described.

  In the rust preventive tool 2 shown in the embodiment, the inner peripheral pointed portion 2a enters the coating layer 1c while peeling off the coating layer 1c by the fixing means composed of bolts 47, nuts 48, etc., and contacts the outer peripheral surface of the metal material 1a. As shown in FIG. 13, the rust preventive tool 502 of Modification 5 exposes the metal material 1a by peeling a part of the coating film layer 1c by a separate peeling means (not shown). The exposed portion 1e is formed along the circumferential direction, and the abutting portion directed toward the metal material 1a along the circumferential direction on the inner circumferential surface of the rust preventer 502 so as to be able to abut on the exposed portion 1e. As a result, an inner peripheral convex portion 502a is formed.

  By doing so, the coating layer 1c is peeled off by using the fixing means constituted by the bolts 47, the nuts 48, and the like to fix the divided casings of the upper casing 11 and the lower casing 12 to each other. Since the inner peripheral convex portion 502a comes into contact with the exposed portion 1e formed by this, and the inner peripheral convex portion 502a and the metal material 1a come into contact with each other, the upper casing 11 and the lower casing 12 are fixed to each other by fixing the divided casings. The rust preventive tool 502 can be easily connected to the fluid pipe 1.

  In addition, the shape and size of the inner peripheral convex part 502a and the exposed part 1e of the modified example 5 are only required to be formed in a pair so that they can be brought into contact with each other. As an example, the width in the longitudinal direction of the fluid pipe 1 in the anticorrosive part 502 The exposed part may be formed by peeling the coating layer over substantially the entire region.

  Further, for example, the inner circumferential convex portion may be formed in a plurality of strips along the circumferential direction on the inner circumferential surface of the rust preventive tool 502, and the exposed portion may be formed in a plurality of strips according to the plurality of inner circumferential convex portions. The circumferential convex portion may be formed in a dot shape on the inner peripheral surface of the rust preventive tool 502, and an exposed portion may be formed according to the number of the dot shapes.

  Next, Modification 6 will be described.

  As shown in FIG. 14, the screw 19 as a fixing tool penetrates the rust prevention tool 602 and the coating layer 1 c from the outer peripheral surface of the rust prevention tool 602 in the rust prevention tool 602 and the fluid pipe 1. Further, by screwing up to the metal material 1a, the tip of the neck lower portion 19a of the screw 19 as the insertion portion reaches the metal material 1a, and the contact between the rust preventive tool 602 and the outer peripheral surface of the fluid pipe 1 is reached. The contact state is maintained. Further, the screw 19 is formed of a conductive member made of metal that is electrically conductive, including the neck lower portion 19a.

  By doing in this way, also when the coating layer 1c is formed in the outer peripheral surface of the fluid pipe | tube 1 using the fixation of the antirust tool 602 and the fluid pipe | tube 1 with the screw | thread 19, Since the neck lower part 19a is inserted from the outer periphery of the rust preventive tool 602 to the metal material 1a, the rust preventive tool 602 and the metal material 1a can be electrically connected via the neck lower part 19a. A conduction state between the rusting tool 602 and the fluid pipe 1 can be ensured.

  In addition, the length of the neck lower part 19a of the modified example 5 is a length in which the tip part of the neck lower part 19a penetrates the rust preventive tool 602 and the coating layer 1c and does not penetrate the metal material 1a of the fluid pipe 1. It is preferable. By doing in this way, since it does not penetrate to the internal peripheral surface of the metal raw material 1a by the front-end | tip part of the neck lower part 19a, the possibility that the fluid which flows through the fluid pipe | tube 1 leaks outside can be prevented.

  Moreover, the fixing tool of the modified example 6 is not limited to the screw 19, and may be, for example, a bolt or a rivet as long as the rust preventive tool 602 and the metal material 1 a are electrically connected via the lower neck.

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

  The fluid pipes 1, 201 and 301 to which the present invention is applied may be fluid pipes laid so as to come into contact with an electrolyte medium such as concrete, seawater, groundwater, etc., outside the water main pipe buried in the soil.

  In addition to the rust prevention of the pipe end surface 1d and the perforated surfaces 201d and 301d exposed by the perforated water construction method as described above, the openings of other existing fluid pipes that cannot be rust-prevented after drilling. It can also be applied to rust prevention measures.

  The material of the rust preventive tool 2, 102, 202, 302 and the rust preventive piece 13 is made of the above aluminum, an aluminum alloy having a relatively high ionization tendency, zinc or an alloy thereof, magnesium or an alloy thereof, or three of them. It is possible to use a combined alloy or the like, and any metal may be used as long as it matches the condition of ionization tendency.

  Moreover, it is not restricted to what was comprised by a pair like the rust preventive tool 2,102,202, For example, what comprised only one side of the half rust preventive tool along the outer periphery of the fluid pipe, or the rust preventive tool 302 It may be formed in one place along a part of the outer periphery of the fluid pipe. Moreover, the antirust tool comprised by three or more division | segmentation structures may be sufficient.

  The interposition member 103 may be an accessory that can be attached to the rust preventive tool 2 and the metal material 1a in an electrically conductive state, and the connecting parts of the conductor members 15 and 16 are electrically connected to the rust preventive piece 13 and the metal material 1a. Any accessory that can be attached in a conductive state.

It is an upper side view which shows the state in which the rust preventive tool in the Example of this invention was attached to the fluid pipe | tube. It is an end view which shows the process in which an upper housing | casing and a lower housing | casing are attached to a fluid pipe | tube. It is sectional drawing which shows the state in which the upper housing | casing and the lower housing | casing were attached to the fluid pipe | tube. (A) is the schematic which showed the perforation apparatus which cut | disconnects a fluid pipe | tube, (b) is the schematic which shows the connection state of a perforation apparatus and a fluid pipe | tube. It is sectional drawing which shows the state in which the water control part was provided in the fluid pipe | tube. It is AA sectional drawing of FIG. It is an expanded sectional view which shows B of FIG. It is an expanded sectional view showing the state where the antirust tool was attached to the fluid pipe in modification 1. It is a front view which shows the state by which the antirust tool was attached to the fluid pipe | tube in the modification 2. It is sectional drawing which shows the state in which the upper housing | casing and the lower housing | casing were attached to the fluid pipe | tube. It is a front view which shows the state by which the antirust tool was attached to the fluid pipe | tube in the modification 3. It is sectional drawing which shows the state in which the antirust tool was provided in the water control part in the modification 4. It is an expanded sectional view showing the state where the antirust tool was attached to the fluid pipe in modification 5. It is an expanded sectional view showing the state where the antirust tool was attached to the fluid pipe in modification 6.

Explanation of symbols

1 Fluid pipe (metal fluid pipe)
1a Metal material 1c Coating layer 1d Pipe end face (metal exposed part)
1e Exposed part 1 'Fluid pipe cut piece 2 Rust prevention tool (rust prevention means, metal lump)
2a Inner peripheral pointed portion 11 Upper housing (divided housing)
12 Lower housing (split housing)
13 Rust prevention piece (rust prevention means, second metal block)
19 Screw (fixture)
19a Lower neck (insertion part)
22 Water Control Department (Water Control Body)
41 Flange (fixing means)
42 Flange (fixing means)
43 Bolt hole (fixing means)
44 Bolt hole (fixing means)
47 bolts (fixing means)
48 nut (fixing means)
102 Rust prevention tool (metal lump)
102a Peripheral point 103 part interposed member (rust prevention means)
103a inner peripheral point 201 metal fluid pipe 201d pipe end face (metal exposed part)
202 Rust prevention tool (rust prevention means, metal lump)
211 Upper housing (split housing)
212 Lower case (split case)
301 metal fluid pipe 301d pipe end face (metal exposed part)
302 Rust prevention tool (rust prevention means, metal lump)
502 Rust prevention tool (rust prevention means, metal lump)
502a Inner peripheral convex part (contact part)
602 Rust prevention tool (rust prevention means, metal lump)

Claims (8)

A metal exposed portion in which the metal material of the metal fluid pipe is directly exposed in the fluid is surrounded by a housing, and is a rust preventing means for performing a rust preventive treatment on the metal exposed portion,
The rust prevention means includes a metal lump made of a metal having a larger ionization tendency than the metal constituting the metal fluid pipe,
Rust preventive means, wherein the metal mass is disposed along the outer periphery of the metal fluid pipe in the housing so as to be electrically connected to the metal fluid pipe. The housing comprises a plurality of divided housings each fixed by a fixing means,
The metal lump is disposed between the inner peripheral surface of the divided housing and the outer peripheral surface of the metal fluid pipe, and maintains a contact state with the outer peripheral surface of the metal fluid pipe by the fixing means. The rust preventive means according to claim 1, wherein: The metal fluid pipe has a coating layer for anticorrosion formed on the outer peripheral surface of a metal material,
The rust preventive means according to claim 2, wherein an inner peripheral pointed portion having a pointed shape toward the outer peripheral surface of the metal material is formed on the inner peripheral surface of the metal block. The metal fluid pipe has a coating layer for anticorrosion formed on the outer peripheral surface of a metal material,
By exposing at least part of the coating layer, an exposed portion is formed where the metal material is exposed,
The rust preventive means according to claim 2, wherein the metal block has a contact portion that contacts the exposed portion. The metal lump is made of a metal having a higher ionization tendency than the housing,
5. The prevention according to claim 2, wherein an outer peripheral pointed portion having a pointed shape toward the inner peripheral surface of the divided housing is formed on the outer peripheral surface of the metal block. Rust means.   The metal lump is maintained in contact with the outer peripheral surface of the metal fluid pipe by a fixture made of a conductive member having an insertion portion inserted from the outer peripheral surface of the metal lump to the metal material. The rust prevention means according to any one of claims 1 to 5, wherein the rust prevention means is provided. A pair of metal exposed portions of the metal fluid pipe are arranged in a state separated in the axial direction in the housing,
The rust preventive means according to any one of claims 1 to 6, wherein the metal block is disposed along the outer periphery of each separated metal fluid pipe. In the housing, at least a part of the metal fluid pipe is excised, and a water control body for controlling the fluid is installed,
The rust preventive means according to any one of claims 1 to 7, wherein a second metal block is provided on the water control body so as to be electrically connected to the metal fluid pipe.

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