JP2015137669A - Fluid pipe end surface anticorrosion device and anticorrosion processing method for fluid pipe end surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pipe end surface anticorrosion device and an anticorrosion processing method for a fluid pipe end surface capable of performing positively the anticorrosion processing while improving working efficiency.SOLUTION: This invention relates to a device for applying anticorrosion processing to a pipe end surface 2a of a fluid pipe 2 comprising: a closing device 3 including a closed part 5 for closing an inside part of the fluid pipe 2 and an operation part 6 capable of expanding diameter and reducing diameter of the closing part; and an anticorrosion cap 4 including an anticorrosion part 41 that can be closely abutted against the pipe end surface 2a of the fluid pipe 2 and a holding part 42 for holding the anticorrosion part 41 against the fluid pipe 2. An outer surface of the closed part 5 is closely abutted against an inner circumferential surface 2b of the fluid pipe 2 when its diameter is expanded through operation of the operation part 6 and the outer diameter of the closed part 5 becomes smaller than that of the inner circumferential end edge 42c of the anticorrosion cap 4 when an outer diameter of the closed part 5 is reduced.

Description

  The present invention relates to an anticorrosion device for anticorrosion treatment of a fluid pipe end face and a corrosion prevention treatment method for the end face of a fluid pipe.

  In piping work such as water and sewage, an anticorrosion ring may be used to prevent corrosion of the pipe end face cut at the pipe cutting point. The conventional anti-corrosion ring is provided with a rubber adhesive that is an anti-corrosion body on the surface facing the pipe end surface, and the anti-corrosion treatment is performed on the pipe end surface by sandwiching the anti-corrosion body between the inwardly projecting piece and the pipe end surface by a predetermined pressing means. There is what can be made (for example, Patent Document 1).

Japanese Utility Model Publication No. 7-22198 (5th page, FIG. 1 and FIG. 2)

  In piping work, a new fluid pipe or an existing fluid pipe may be cut according to the application and connected to a target flow path component member. Even when such a fluid pipe is cut, the cut surface or pipe is cut. The end face must be anticorrosive. In such a case, first, the upstream side of a predetermined cutting location is temporarily stopped and then cut. Next, after confirming that the fluid existing between the stop fluid portion and the cut portion is completely discharged from the cut portion, the anticorrosion ring is attached to the pipe end surface of the fluid pipe.

  If the fluid is not completely discharged during the operation of attaching the anticorrosion ring, there is a possibility that a sufficient anticorrosion effect may not be obtained because the fluid is interposed between the pipe end surface of the fluid pipe and the anticorrosive body of the anticorrosion ring. For this reason, there is a problem that the anti-corrosion treatment cannot be performed until the fluid existing between the upstream stop fluid portion and the cut portion is completely discharged from the cut portion, and the working efficiency is low.

  The present invention has been made paying attention to such problems, and provides a fluid pipe end face anticorrosion device and a fluid pipe end face anticorrosion treatment method capable of reliably performing anticorrosion treatment while improving work efficiency. Objective.

In order to solve the above-mentioned problem, the fluid pipe end surface anticorrosion device of the present invention comprises:
An apparatus for anticorrosion treatment of the pipe end surface of a fluid pipe,
A closing device comprising a closing part for closing the inside of the fluid pipe, an operation part capable of expanding and reducing the diameter of the closing part, and an anticorrosion part capable of sealingly contacting the pipe end surface of the fluid pipe And an anti-corrosion cap having a holding part for holding the anti-corrosion part with respect to the fluid pipe,
The closed portion is in sealing contact with the inner peripheral surface of the fluid pipe when the outer surface of the closed portion is expanded by the operation of the operation portion, and when the outer diameter of the closed portion is reduced, It is characterized by a smaller diameter than the inner peripheral edge.
According to this feature, since the inside of the fluid pipe can be closed by operating the operating part and expanding the closed part to prevent the fluid from flowing out to the end of the fluid pipe, the pipe end face of the fluid pipe and the anticorrosion part Can be attached to the fluid pipe without any fluid interposed between them. In addition, since the closure device can be easily removed without reducing the diameter of the closure by operating the operation unit and interfering with the anti-corrosion cap, the anti-corrosion treatment can be reliably performed while reducing the time required for the anti-corrosion treatment in the piping work. Can do.

The said closure part has the 1st member, the 2nd member, and the closure body which consists of an elastic member arrange | positioned between the said 1st member and the said 2nd member, It is characterized by the above-mentioned.
According to this feature, the closing member is sandwiched and deformed by relatively approaching the first member and the second member by operation of the operation portion, and the closing portion is deformed with respect to the inner peripheral surface of the fluid pipe. And the fluid pipe can be closed. In addition, the closing device can be easily removed without reducing the diameter of the closing body by operating the operation unit and interfering with the anticorrosion cap.

The closing device is characterized in that a hole penetrating the closing portion in the tube axis direction is formed.
According to this feature, since the inside of the fluid pipe is maintained at the atmospheric pressure, an increase in the fluid pressure in the pipe can be prevented, and a decrease in the function of the closing device can be prevented.

The said obstruction | occlusion part has the auxiliary | assistant obstruction | occlusion body which is detachably crowned on the outer periphery of the said obstruction | occlusion body.
According to this feature, by attaching and detaching the auxiliary closing body, it is possible to adjust the outer diameter at which the closing portion can be expanded in accordance with the inner diameter of the fluid pipe, and the versatility of the closing device can be enhanced.

The anticorrosion treatment method of the end face of the fluid pipe of the present invention is
A method for anticorrosion treatment of a pipe end surface of a fluid pipe,
Inserting at least the closure of the closure device into the fluid line;
A step of operating the operating portion to expand the diameter of the closed portion and bringing the closed portion into contact with the inner peripheral surface of the fluid pipe in a sealing manner;
Holding the anti-corrosion cap on the fluid pipe so that the anti-corrosion part of the anti-corrosion cap contacts the pipe end surface of the fluid pipe; and
Re-operating the operating portion to reduce the diameter of the closed portion from the inner peripheral edge of the anti-corrosion cap;
Removing the occlusion device from the fluid line;
It is characterized by having.
According to this feature, the diameter of the closed portion is increased by operation of the operation portion, and the fluid pipe is closed in contact with the inner peripheral surface of the fluid pipe in a sealed manner to prevent the fluid from flowing out to the end of the fluid pipe. Therefore, it can be attached to the fluid pipe in a state where no fluid is interposed between the pipe end surface of the fluid pipe and the anticorrosion portion. In addition, since the closing device is removed from the fluid pipe after the closing portion has been reduced in diameter by operating the operation portion, the closing device can be easily removed without interfering with the anticorrosion cap. Therefore, the anticorrosion treatment can be surely performed while reducing the time required for the anticorrosion treatment in the piping work.

It is a schematic diagram which shows the state which inserted the obstruction | occlusion apparatus in an Example in the fluid pipe | tube. (A) is a top view which shows the obstruction | occlusion apparatus in an Example, (b) is a rear view similarly. It is AA sectional drawing of Fig.2 (a). It is a schematic diagram which shows the state which obstruct | occluded the fluid pipe | tube with the obstruction | occlusion apparatus in an Example. It is a schematic diagram which shows the operation | work which inserts an anti-corrosion cap toward a fluid pipe end surface. It is a schematic diagram which shows the operation | work which fixes the anticorrosion cap fitted to the fluid pipe end surface. It is a schematic diagram which shows the operation | work which reduces the diameter of the obstruction body of an obstruction | occlusion apparatus. It is a schematic diagram which shows the state after removing the obstruction | occlusion apparatus from the inside of a fluid pipe | tube. (A) is a sectional side view which shows the modification 1 of an obstruction | occlusion apparatus, (b) is BB sectional drawing of (a). (A) is a perspective view which shows the state before inserting the obstruction body of the obstruction | occlusion apparatus in the modification 2 in an auxiliary | assistant obstruction body, (b) is the state after inserting an occlusion apparatus in an auxiliary | assistant obstruction body similarly. It is a perspective view shown.

  EMBODIMENT OF THE INVENTION The form for implementing the anti-corrosion apparatus of the fluid pipe end surface which concerns on this invention, and the anti-corrosion treatment method of a fluid pipe end surface is demonstrated below based on an Example.

  A fluid pipe end surface anticorrosion device according to an embodiment will be described with reference to FIGS. 1 to 8. Hereinafter, the left side of the screen in FIG. 1 will be described as the front side (front side) of the closing device.

  As shown in FIG. 1, the fluid pipe 2 of the present embodiment is made of, for example, ductile cast iron for waterworks buried in the ground, and is formed in a substantially circular shape in cross section, and the inner peripheral surface is powder-coated or Covered with a mortar layer. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. Further, in this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water, for example, industrial water, agricultural water, sewage, etc., gas, gas and liquid The gas-liquid mixture may be used.

  In this embodiment, an example in which an existing fluid pipe is cut in piping work and connected to a flow path constituent member (not shown) by a push ring or the like is taken, and the cut surface of the fluid pipe 2, that is, the pipe end face 2a is used as the fluid pipe. The aspect which carries out anticorrosion processing with the end surface anticorrosion apparatus 1 (refer FIG. 5 thru | or FIG. 7) is demonstrated.

  The step of cutting the existing fluid pipe 2 is performed after first closing a stop fluid device such as a valve (not shown) provided on the upstream side of a predetermined cutting point. FIG. 1 shows a state after the cutting step, and shows a state in which the fluid remaining between the fluid stopping device and the cutting surface, that is, the pipe end surface 2a flows out from the cutting portion.

  As shown in FIGS. 1 to 3, the closing device 3 that constitutes the fluid pipe end surface corrosion prevention device 1 together with the anticorrosion cap 4 described later includes a closing portion 5 for closing the inside of the fluid tube 2, and a closing portion 5. An operating portion 6 capable of expanding and reducing the diameter is provided. The closing part 5 is mainly composed of a first member 7 and a second member 8 that are arranged to face each other, and a closing body 9 that is arranged between the first member 7 and the second member 8. The closing body 9 is made of an elastic member such as an endless annular rubber, and has a shape having tapers 9a and 9a whose cross section is narrowed inward.

  As shown in FIG. 3, the first member 7 includes a pressing piece 10 and a screwing shaft portion 11 extending from the approximate center of the pressing piece 10 to the second member 8 side. The threaded shaft portion 11 has a hollow shape having a through hole 12 that penetrates the first member 7 in the tube axis direction of the fluid tube 2. In the second member 8, a pressing piece 13 and an insertion hole 14 through which the screwing shaft portion 11 of the first member 7 can be inserted are formed in the approximate center of the pressing piece 13. The inner diameter of the insertion hole 14 formed in the second member 8 is substantially the same as or slightly larger than the outer diameter of the screwing shaft portion 11 of the first member 7. The second member 8 has a small hole 18 as a hole provided in parallel with the insertion hole 14. Further, a cylindrical portion 20 surrounding the operation portion 6 described later is fixed to the second member 8 on the surface opposite to the surface facing the first member 7.

  A male screw portion 11a is formed on the outer periphery of the screwing shaft portion 11 of the first member 7, and a female screw portion 6a formed on the inner periphery of the operation portion 6 to be described later can be screwed. Therefore, when the operation part 6 is screwed in a state where the insertion hole 14 of the second member 8 is inserted into the screwing shaft part 11 of the first member 7, the first member 7, the second member 8, The closing member 5 disposed between the first member 7 and the second member 8 is integrated to form the closing portion 5.

  As shown in FIG. 3, the operation portion 6 is formed in a hollow cylindrical shape, and has a female screw portion 6 a that is screwed into the screw shaft portion 11 of the first member 7 described above on the inner periphery at one end in the longitudinal direction. A knob portion 6b used by the operator for manual operation of the operation portion 6 is formed at the other end in the longitudinal direction. Moreover, the hose nipple 16 which attaches the hose 15 (refer FIG. 4) mentioned later is being fixed to the other end of a longitudinal direction.

  A washer 17 is preferably interposed between the end face 6c on the side having the female screw portion 6a in the operation portion 6 and the pressing piece 13 of the second member 8 and preferably made of a resin member having a low friction coefficient and elasticity. Thus, the first member 7 and the second member 8 can be brought relatively close to each other via the washer 17 by the rotation operation of the operation unit 6. The washer 17 is not limited to the resin member described above, and may be formed of an elastic member such as a metal member or rubber, for example. Then, due to the relative proximity movement of the first member 7 and the second member 8, the closing body 9 disposed between the first member 7 and the second member 8 is pinched by the pressing pieces 10 and 13. Will be transformed. The diameter-enlarged state and the diameter-reduced state of the closing body 9 can be adjusted by the screwing depth between the operating portion 6 and the screwing shaft portion 11 of the first member 7. Further, the closed body 9 can have a smaller diameter than the inner diameter of the inner peripheral edge 42c of the annular wall portion 42a of the anticorrosion cap 4 described later in a reduced diameter state by the operation of the operation portion 6 described above, that is, in a natural state. Designed to be

  The pressing piece 10 of the first member 7 is provided with a tapered portion 10a having an outward slope on the outer edge side, and similarly has an outward inclination on the outer edge side of the pressing piece 13 of the second member 8. A tapered portion 13a is provided. These taper portions 10a and 13a have substantially the same angle as the tapers 9a and 9a of the closing body 9, and as shown in FIG. 3 and FIG. 4, the relative relationship between the first member 7 and the second member 8 described above. When the occlusion body 9 is clamped by an approximate proximity movement, the occlusion body 9 is configured such that the taper portions 9a and 9a move the taper portions 10a and 13a of the first member 7 and the second member 8 radially outward. The tube 2 is extruded without being twisted toward the inner peripheral surface 2b of the tube 2. Note that a lubricating coating agent is applied between the taper portions 9a and 9a of the closing body 9 and the taper portions 10a and 13a of the first member 7 and the second member 8, and the closing body 9 is easily pushed out. It is preferable to become.

  As shown in FIG. 5, the anticorrosion cap 4 constituting the fluid pipe end surface anticorrosion device 1 has a substantially annular shape when viewed from the front, and is attached to the pipe end surface 2 a of the fluid pipe 2 over the entire circumference. The anticorrosive body 41 (corrosion prevention part) which has adhesiveness and the holding body 42 (holding part) which hold | maintains the anticorrosion body 41 are mainly comprised. In addition, the anticorrosion cap should just follow the shape of a fluid pipe | tube, An annular | circular shape, elliptical shape, etc. may be sufficient.

  The holding body 42 is formed of an elastic member such as a synthetic resin, and has an annular wall portion 42a positioned in front of the pipe end surface 2a of the fluid pipe 2 and an outer periphery of the fluid pipe 2 extending from the annular wall portion 42a. And an extending portion 42b that is fitted on the surface 2c.

  The anti-corrosion cap 4 of the present embodiment is formed so that the inner diameter of the annular wall portion 42a located in front of the pipe end surface 2a of the fluid pipe 2 is smaller than that of the standard fluid pipe 2, and therefore, the same level of standards. It can be commonly attached to the fluid pipe to provide an anticorrosive action. Therefore, when attached to the fluid pipe 2, the annular wall portion 42 a may partially project inside the fluid pipe 2. In the present embodiment, a part of the annular wall 42 a protrudes inside the fluid pipe 2.

  Next, the process of actually performing the anticorrosion treatment on the pipe end surface 2a of the fluid pipe 2 using the fluid pipe end surface anticorrosion device 1 will be described with reference to FIGS. First, as described above, a process of closing the fluid pipe 2 by performing a closing operation on a stop fluid device such as a valve provided on the upstream side from a predetermined cutting location is performed.

  Next, a step of inserting the closing portion 5 of the closing device 3 inside the fluid pipe 2 is performed (see FIG. 1). At this time, as for the obstruction | occlusion part 5 of the obstruction | occlusion apparatus 3, the obstruction | occlusion body 9 is a diameter-reduced state. Therefore, the closing body 9 does not come into contact with the inner peripheral surface 2 b of the fluid pipe 2, and the closing portion 5 of the closing device 3 can be easily inserted inside the fluid pipe 2. Further, when the closing part 5 of the closing device 3 is inserted inside the fluid pipe 2, the cylinder part 20 can be grasped and the closing part 5 of the closing apparatus 3 can be inserted inside the fluid pipe 2, so that the insertion work is easy to perform. .

  Next, as shown in FIG. 4, a step of sealingly sealing the tube end surface 2a side of the fluid tube 2 is performed. Specifically, by rotating the knob portion 6 b of the operation portion 6 of the closing device 3, the closing member 9 is pinched by the first member 7 and the second member 8 so that the diameter is expanded. As described above, the small hole 18 is formed in the second member 8, and the internal space of the fluid pipe 2 closed by the first member 7, the second member 8, and the closing body 9 is small. Since the air communicates with the atmosphere through the holes 18, the air in the internal space is discharged to the outside through the small holes 18 so that the operation unit 6 can be easily operated.

  As shown in FIG. 4, the outer diameter of the closing body 9 at the time of diameter expansion is larger than the inner peripheral surface 2 b of the fluid pipe 2. Therefore, the closing body 9 is pressed against the inner peripheral surface 2b of the fluid pipe 2, and the pipe end face 2a side of the fluid pipe 2 is closed in a sealed manner. Thereby, the anticorrosion process mentioned later can be performed in the state which prevented that the fluid adhered to the pipe end surface 2a of the fluid pipe | tube 2. FIG.

  In the closed state by the closing body 9, the inside and outside of the fluid pipe 2 communicate with each other through the through hole 12 of the screwing shaft portion 11, the hollow operation portion 6, the hose nipple 16 and the hose 15. (See FIG. 3). According to this, since the inside of the fluid pipe 2 is maintained at atmospheric pressure, when a predetermined amount or more of fluid remains between the fluid stopping apparatus and the pipe end surface 2a of the fluid pipe 2, the fluid stopping apparatus And the liquid remaining between the pipe end surface 2a of the fluid pipe 2 is discharged to the outside until the water level is lower than the inner peripheral lower edge 12a of the through-hole 12 of the screw shaft 11. Therefore, an increase in the fluid pressure in the fluid pipe 2 can be prevented, and a decrease in the sealing function of the closing device 3 can be prevented.

  Further, since the hose 15 is set to have a dimension that at least its end 15a is disposed outside the pipe end surface 2a of the fluid pipe 2, the pipe of the fluid pipe 2 for fluid discharged from the hose 15 to the outside. Adhesion to the end surface 2a can be prevented. In addition, since the washer 17 is interposed between the end surface 6c of the operation unit 6 and the pressing piece 13 of the second member 8, the fluid flowing in the hollow operation unit 6, the hose nipple 16 and the hose 15 side is operated. The sealed state between the end surface 6c of the portion 6 and the pressing piece 13 of the second member 8 is maintained, and leakage of fluid from the both is prevented.

  Subsequently, a process of cleaning the pipe end surface 2a of the fluid pipe 2 (not shown) and the vicinity thereof is performed, and after removing the pipe end face 2a of the fluid pipe 2 and impurities in the vicinity thereof, as shown in FIGS. In addition, a step of subjecting the pipe end surface 2a of the fluid pipe 2 to the anticorrosion treatment by the anticorrosion cap 4 is performed. The anticorrosion treatment of the pipe end surface 2a of the fluid pipe 2 by the anticorrosion cap 4 will be described in detail. As shown in FIG. 5, the anticorrosion cap 4 is inserted along the hose 15 arranged on the knob portion 6b side of the operation portion 6. Then, as shown in FIG. 6, the extending portion 42 b of the anticorrosion cap 4 is expanded in diameter and is fitted on the outer peripheral surface 2 c of the fluid pipe 2. And the outer periphery of the anti-corrosion cap 4 is pressed along the circumferential direction with the roller-shaped attachment jig 19. Thereby, the anti-corrosion cap 4 is hold | maintained at the fluid pipe | tube 2 in the state which adhered the anti-corrosion body 41 to the pipe end surface 2a of the fluid pipe | tube 2. As shown in FIG.

  Since this anticorrosion treatment process is performed in a state in which the fluid flowing out from the fluid pipe 2 is prevented from adhering to the pipe end surface 2a, the anticorrosive treatment process is performed in a clean state in which no fluid adheres to the anticorrosive body 41 of the pipe end surface 2a and the anticorrosion cap 4. The anticorrosive body 41 can be adhered to the pipe end surface 2a of the fluid pipe 2 with high adhesive force, and a reliable anticorrosion function is exhibited on the pipe end face 2a of the fluid pipe 2.

  Thereafter, as shown in FIG. 7, a step of reducing the diameter of the closing body 9 is performed. The step of reducing the diameter of the closing body 9 is performed by rotating the operating portion 6 in the direction opposite to the rotating direction of the operating portion 6 when the diameter of the closing body 9 is increased. By the rotation operation of the operation unit 6, the operation unit 6 is retracted along the screwing shaft portion 11 of the first member 7, the closed body 9 that has been compressed is elastically restored, and the second member 8 is the first member. Therefore, the closed body 9 is in a reduced diameter state. The outer diameter of the closed body 9 when the diameter is reduced is smaller than the inner peripheral edge 42 c of the annular wall portion 42 a of the anticorrosion cap 4 protruding into the fluid pipe 2. Thereby, when the fluid remains between the fluid stopping device and the pipe end surface 2a of the fluid pipe 2, the fluid flows out from the cut portion to the outside.

  Next, as shown in FIG. 8, a step of removing the closing portion 5 of the closing device 3 in which the closing body 9 has a reduced diameter from the fluid pipe 2 is performed. At this time, as described above, since the outer diameter of the blocking body 9 can be made smaller than the inner peripheral edge 42c of the annular wall portion 42a of the anticorrosion cap 4, the blocking portion 5 interferes with the anticorrosion cap 4. The occlusion device 3 can be easily removed without any trouble.

  As described above, after the fluid tube 2 is cut, the closing portion 5 of the closing device 3 is inserted inside the fluid tube 2 and the operating portion 6 is operated to expand the diameter of the closing body 9. 2 can be closed to prevent the fluid from flowing out to the pipe end surface 2a side of the fluid pipe 2. Accordingly, without waiting for the fluid remaining between the fluid stopping device and the pipe end surface 2a of the fluid pipe 2 to be completely discharged from the pipe end face 2a side of the fluid pipe 2, the fluid pipe 2 by the anticorrosion cap 4 is used. It is possible to start the anticorrosion treatment work for the pipe end surface 2a.

  Further, during the anticorrosion treatment operation, the fluid is prevented from flowing out toward the pipe end surface 2 a of the fluid pipe 2 by the closing device 3, so that the anticorrosive body 41 between the pipe end face 2 a of the fluid pipe 2 and the anticorrosion cap 4 is interposed between the pipes. The anticorrosion treatment of the pipe end surface 2a of the fluid pipe 2 is reliably performed without the fluid.

  Further, the outer diameter of the closing body 9 in the reduced diameter state is smaller than the inner peripheral edge 42c of the annular wall portion 42a of the anticorrosion cap 4, and the anticorrosion cap 4 does not interfere with the closing portion 5. The occlusion device 3 can be removed. Further, as described above, since the holding body 42 of the anticorrosion cap 4 has elasticity, even if the closing body 9 contacts the annular wall portion 42a of the anticorrosion cap 4 at the time of removal, the anticorrosion cap 4 is attached to the end surface of the fluid pipe. The anti-corrosion cap 4 is difficult to come off from the fluid pipe end surface 2a by absorbing the force acting in the direction of removal from 2a. Therefore, the closing device 3 can be easily removed without reducing the anticorrosion function of the anticorrosion cap 4 with respect to the pipe end surface 2a of the fluid pipe 2. Therefore, it is possible to reliably complete the anticorrosion treatment while reducing the time required for the anticorrosion treatment of the pipe end surface 2a of the fluid pipe 2 in the piping work.

  Moreover, there are the following modifications of the occlusion device, and the embodiment shown in FIG. 9 will be described as a first modification of the occlusion device. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 9, the closing part 51 of the closing device 31 is mainly composed of a first member 71, a second member 81, and a closing body 9. As shown in FIG. 9B, the first member 71 includes a threaded shaft portion 111 and a cylindrical portion that extends in parallel with the threaded shaft portion 111 at a position on the outer diameter side of the pressing piece 101 of the first member 71. 201. The cylindrical portion 201 has a hollow shape having a through hole 121, and the hose nipple 16 is fixed to the other end in the longitudinal direction. The pressing piece 131 of the second member 81 is formed with an insertion hole 14 and an insertion hole 141 through which the cylindrical portion 201 can be inserted. The insertion hole 141 is formed in a size that allows the cylindrical portion 201 to be loosely inserted.

  As shown in FIG. 9, the operation unit 61 of the closing device 31 includes a female screw portion 6 a at one end in the longitudinal direction, and a handle that an operator holds at the other end in the longitudinal direction when operating the operation unit 61. A portion 61b is provided.

  In the closing device 31 of the present modification, the cylindrical portion 201 is provided at a position on the outer diameter side of the pressing piece 101 of the first member 71, and the closed body 9 is disposed in a state where the cylindrical portion 201 is disposed at the lower portion in the fluid pipe. By expanding the diameter of the fluid, the fluid remaining in the fluid pipe 2 can be discharged to the outside from a lower position in the fluid pipe 2. Therefore, the fluid pressure in the fluid pipe 2 applied to the closing part 51 can be lowered, and this is particularly effective for a large diameter fluid pipe or the like in which a large fluid pressure is easily applied to the closing part 51.

  Further, since the cylindrical portion 201 is loosely inserted into the insertion hole 141 of the second member 81, the relative rotation between the first member 71 and the second member 81 is restricted during the rotation operation of the operation portion 61, and the closing portion 51. The sealing function is maintained. Further, since air can escape from the gap between the insertion hole 141 of the second member 81 and the cylindrical portion 201, the operation portion 61 can be easily operated.

  Further, as a second modification of the occlusion device, there is the following. As shown in FIG. 10, the occluding device 3 ′ includes an auxiliary occluding body 21 to be crowned on the outer peripheral surface of the occluding body 9. The auxiliary closing body 21 has an inner diameter that is larger than the outer diameter of the closing body 9 when the diameter is reduced and smaller than the outer diameter of the closing body 9 when the diameter is increased. The auxiliary closing member 21 is made of an elastic member such as an endless annular rubber.

  According to this, for example, even when the closing device 3 ′ is used for a fluid pipe having an inner peripheral surface larger than the outer diameter of the closing body 9 at the time of diameter expansion, the auxiliary closing body 21 is attached. The outer diameter of the closing portion 5 that can be expanded can be adjusted in accordance with the inner diameter of the fluid pipe. Therefore, the versatility of the closure device can be enhanced.

  Moreover, since the auxiliary closure body 21 can be crowned by the closure body 9 by expanding the diameter of the closure body 9 after inserting the auxiliary closure body 21 in a state where the diameter of the closure body 9 is reduced, The crowning operation of the body 21 is easy.

  Although not shown in the drawings, when removing the closing device 3 ′ after reducing the diameter of the closing body 9, even if the auxiliary closing body 21 contacts the annular wall portion 42a of the anticorrosion cap 4 described above, Since the closing body 9 and the auxiliary closing body 21 are not integrated, only the closing device 3 ′ is removed so that the auxiliary closing body 21 remains in the fluid pipe 2. Therefore, it is possible to prevent the auxiliary closing body 21 from applying a force in the direction of removing the anti-corrosion cap 4 from the fluid pipe end surface 2a during the removal operation of the closing device 3 ′, and the anti-corrosion cap 4 prevents the fluid pipe end surface 2a from being corroded. Can keep.

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

  For example, in the said Example, the obstruction | occlusion part 5 of the obstruction | occlusion apparatus 3 comprised the 1st member 7, the 2nd member 8, and the obstruction | occlusion body 9, but it is not restricted to this, By injecting air from the outside It may be an enormous rubber bag.

  Moreover, the auxiliary | assistant obstruction body 21 may be formed with the same material as the obstruction | occlusion body 9 of the obstruction | occlusion apparatus 3 ', and may be formed with a different material. In addition, in the said Example, although the front-back width of the auxiliary | assistant obstruction | occlusion body 21 became substantially the same width as the obstruction | occlusion body 9, the width | variety larger than the obstruction | occlusion body 9 may be sufficient, and a small width | variety may be sufficient.

  Further, in this embodiment, the step of cutting the existing fluid pipe 2 is performed after first closing a stop fluid device such as a valve (not shown) provided on the upstream side of the predetermined cutting point. For example, in the case of a new pipe, the pipe line may be configured by connecting to the pipe via the flow path component so that the cut surface of the new fluid pipe cut in advance is exposed. In this case, as a countermeasure to the remaining fluid after the fluid pressure test, the fluid pipe end face corrosion prevention apparatus and the fluid pipe end face corrosion prevention method of the present invention can be applied to a newly installed fluid pipe.

1 Fluid pipe end face anticorrosion device 2 Fluid pipe 2a Pipe end face (cut surface)
DESCRIPTION OF SYMBOLS 3 Closure apparatus 4 Corrosion prevention cap 5 Closure part 6 Operation part 7 1st member 8 2nd member 9 Closure body 11 Screwing shaft part 12 Through-hole 18 Small hole (hole)
20 Cylinder part 21 Auxiliary obstruction body 31, 3 'obstruction | occlusion apparatus 41 Corrosion prevention body (corrosion prevention part)
42 Holder (Holder)
42c Inner peripheral edge 51 Closure part 61 Operation part 71 1st member 81 2nd member 111 Screwing shaft part 121 Through-hole 201 Cylindrical part

Claims (5)

An apparatus for anticorrosion treatment of the pipe end surface of a fluid pipe,
A closing device comprising a closing part for closing the inside of the fluid pipe, an operation part capable of expanding and reducing the diameter of the closing part, and an anticorrosion part capable of sealingly contacting the pipe end surface of the fluid pipe And an anti-corrosion cap having a holding part for holding the anti-corrosion part with respect to the fluid pipe,
The closed portion is in sealing contact with the inner peripheral surface of the fluid pipe when the outer surface of the closed portion is expanded by the operation of the operation portion, and when the outer diameter of the closed portion is reduced, A fluid pipe end face anticorrosion device having a smaller diameter than an inner peripheral edge.   The said closure part has a 1st member, a 2nd member, and the obstruction body which consists of an elastic member arrange | positioned between the said 1st member and the said 2nd member, It is characterized by the above-mentioned. The fluid pipe end surface anticorrosion device according to 1.   The fluid pipe end surface anticorrosion apparatus according to claim 1 or 2, wherein the closing device has a hole penetrating the closing portion in a tube axis direction.   4. The fluid pipe end surface anticorrosion device according to claim 1, wherein the closing portion includes an auxiliary closing body that is detachably crowned on an outer periphery of the closing body. 5. A method for anticorrosion treatment of a pipe end surface of a fluid pipe,
Inserting at least the closure of the closure device into the fluid line;
A step of operating the operating portion to expand the diameter of the closed portion and bringing the closed portion into contact with the inner peripheral surface of the fluid pipe in a sealing manner;
Holding the anti-corrosion cap on the fluid pipe so that the anti-corrosion part of the anti-corrosion cap contacts the pipe end surface of the fluid pipe; and
Re-operating the operating portion to reduce the diameter of the closed portion from the inner peripheral edge of the anti-corrosion cap;
Removing the occlusion device from the fluid line;
An anticorrosion treatment method for a fluid pipe end face, comprising:

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