JP5775014B2 - Corrosion prevention method and anticorrosion core for perforated opening - Google Patents

Description

  The present invention relates to an anticorrosion method for a perforation port and an anticorrosion core for preventing the perforation port formed in a fluid pipe.

  In recent years, so-called continuous water drilling, in which an existing water pipe (an example of a fluid pipe) is drilled in a continuous water state, has been performed. Such a construction method is used for various constructions such as piping a branch passage through a perforation port or inserting a valve body into the pipe from the perforation port to temporarily stop water. When using the water pipe after that, if the end face of the perforation port is exposed, water may enter the interface of the lining layer covering the inner surface of the pipe, or the generated rust may be mixed into the pipe. It is desirable to apply anticorrosion treatment to the end face of the mouth.

  In Patent Document 1, an anticorrosion part that abuts the end surface of the perforation port is provided on the outer periphery of the cylindrical body, and the anticorrosion part has a larger diameter than the perforation port in a natural state, and its elastic return force is used as a pressing force to An anticorrosion sleeve is described in which an anticorrosion part is pressed on the end face. However, in order to ensure the pressing force of the anticorrosion part with respect to the perforation port, the outer diameter of the anticorrosion part must be sufficiently larger than the diameter of the perforation port, and it is necessary to strongly push the cylindrical body into the perforation port. Therefore, it is considered that the workability is not so good.

  In Patent Document 2, a thick-walled elastic body is inserted into a thin-walled metal tube fitted into a perforation opening, and the thick-elastic body is bulged and deformed toward the inner surface of the perforation opening. An anticorrosion method for a perforated opening in which a thin metal tube is pressed and adhered is described. However, when a perforated opening having a relatively large diameter is formed, the volume of the thick elastic body increases accordingly, so that the force required for the bulging deformation of the thick elastic body and the size of the working device are reduced. It increases and it is thought that workability is not so good.

JP 2011-117572 A Japanese Patent Publication No.57-12916

  This invention is made | formed in view of the said situation, The objective is to provide the anticorrosion method and anticorrosion core of a drilling hole which can perform the anticorrosion treatment with respect to the end surface of a drilling hole simply, and are excellent in workability. is there.

  The above object can be achieved by the present invention as described below. That is, in the anticorrosion method for a perforation port according to the present invention, the anticorrosion core is attached to the perforation port formed on the peripheral wall of the fluid pipe, and the end surface of the perforation port is anticorrosive. Using the anticorrosion core having a cylindrical body portion provided with a sealing material, and having an outer diameter equal to or less than the diameter of the perforation port in a natural state, the anticorrosion core at the perforation port An internal fitting step in which the body portion faces the end face of the perforation port, and an axial compression force is applied to the anticorrosion core to buckle the frame material, and accordingly, the frame material swells radially outward. And a diameter expanding step of pressing the sealing material of the barrel part that has been deformed out against the end face of the perforation port. In this method, by applying a compressive force to the anticorrosion core to the extent that the frame material buckles, the seal material of the trunk is pressed against the end surface of the perforation port, so that the anticorrosion treatment can be easily performed on the end surface of the perforation port. It is possible and excellent in workability.

  In the anticorrosion method for a hole according to the present invention, it is preferable that the frame material is a cylindrical body having a large number of voids. Thereby, since the rigidity of the frame material is reduced and buckling is likely to occur, the work of pressing the seal material against the end face of the perforation port is facilitated, and the workability can be improved satisfactorily.

  In the anticorrosion method for the perforated opening, the frame material is constituted by a number of strip plates which are formed in a slit shape extending in the axial direction and intermittently arranged in the circumferential direction and divided by the slit-shaped gap. It is preferable that Thereby, when a frame material buckles, it becomes easy to express the bulging deformation | transformation of a trunk | drum, usability improves, and workability | operativity improves effectively.

  In the anticorrosion method for a perforation port according to the present invention, a protrusion projecting radially outward is provided on the front end side of the frame material, and in the internal fitting step, the front end side of the frame material is elastically deformed while the perforation port is It is preferable that an anticorrosion core is fitted inside, and after the diameter expansion step, the protrusion is engaged with the inner surface of the tube of the perforation port to prevent the anticorrosion core from coming out. Thus, by preventing the corrosion-proof core from slipping out, it is possible to enhance the practicality when the anti-corrosion treatment is performed.

  Further, the anticorrosion core according to the present invention is a cylindrical shape that is attached to a perforation port formed in the peripheral wall of the fluid pipe, and is arranged to face the end surface of the perforation port in the anticorrosion core that prevents the end surface of the perforation port. The frame portion has a frame material buckled by an axial compressive force, and a seal material provided on the outer periphery of the frame material, and the body portion is radially outward with the buckling of the frame material. It is configured to bulge and deform so that the sealing material can be pressed against the end face of the hole. According to this configuration, by applying a compressive force to the anticorrosion core to the extent that the frame material buckles, the seal material of the trunk portion is pressed against the end surface of the perforation port, and thus the anticorrosion treatment for the end surface of the perforation port is simply performed. It can be used and has excellent workability.

  In the anticorrosion core of the present invention, the frame material is preferably a cylindrical body having a large number of voids. Thereby, since the rigidity of the frame material is reduced and buckling is likely to occur, the work of pressing the seal material against the end face of the perforation port is facilitated, and the workability can be improved satisfactorily.

  In the anticorrosion core, the gap is formed in a slit shape extending in the axial direction and intermittently arranged in the circumferential direction, and the frame material is constituted by a large number of strip plates divided by the slit-like gap. It is preferable. Thereby, when a frame material buckles, it becomes easy to express the bulging deformation | transformation of a trunk | drum, usability improves, and workability | operativity improves effectively.

  In the anticorrosion core of the present invention, it is preferable that the frame material has a barrel shape curved radially outward in a natural state. As a result, the frame material buckles relatively easily, and the body portion is easily bulged and deformed radially outward, improving usability and improving workability effectively.

The perspective view which shows an example of the anticorrosion core which concerns on this invention (A) perspective view and (B) front view of the anticorrosion core excluding the sealing material The perspective view which shows the compression state of the anticorrosion core except a sealing material Sectional view showing the anticorrosion core before being fitted into the perforated opening Sectional view showing the anticorrosion core that has begun to be fitted into the perforation opening Sectional view showing the anticorrosion core fitted in the perforated opening Sectional view showing the anticorrosion core before expanding the diameter Cross-sectional view showing an expanded anticorrosion core Sectional drawing which shows the anticorrosion core which concerns on another embodiment of this invention Sectional drawing which shows the anticorrosion core which concerns on another embodiment of this invention

  Embodiments of the present invention will be described with reference to the drawings. The anticorrosion core 2 shown in FIG. 1 is attached to a perforation port 11 formed in the peripheral wall of a water pipe 10 (an example of a fluid pipe) as shown in FIGS. 6 and 8, in order to protect the end surface 12 of the perforation port 11. used. The water pipe 10 is made of a metal such as ductile cast iron, and a metal base appears on the end face 12 of the perforated port 11. The inner surface of the water pipe 10 is covered with a lining layer 13 formed of mortar or resin.

  The anticorrosion core 2 includes a cylindrical body portion 20 that is disposed so as to face the end surface 12 of the perforation port 11. The body portion 20 includes a frame material 21 constituting the skeleton and a seal material 22 provided on the outer periphery of the frame material 21. FIG. 2 shows the anticorrosion core 2 excluding the sealing material 22. The frame material 21 is configured to buckle when an axial compressive force as described later is applied. The axial direction refers to the axial direction of the anticorrosion core 2, and corresponds to the vertical direction in FIG.

  The frame material 21 is a cylindrical body having a large number of voids 23. In this embodiment, the space | gap 23 comprises the slit shape extended in an axial direction, and is arrange | positioned intermittently in the circumferential direction, and the frame material 21 is comprised by many strip plates divided by the slit-shaped space | gap 23. FIG. An annular lower collar 24 along the circumferential direction and a pair of projections 25 projecting radially outward are integrally provided on the distal end side of the frame material 21. An annular upper collar 26 is integrally provided on the rear end side of the frame material 21 along the circumferential direction.

  In the anticorrosion core 2, the frame material 21 buckles when an axial compressive force as described later is applied, and the body portion 20 bulges and deforms outward in the radial direction along with the buckling of the frame material 21, and is perforated. The sealing material 22 is configured to be pressed against the end surface 12 of the mouth 11. FIG. 2 shows the anticorrosion core 2 in a natural state where no external force is acting. When this is compressed in the axial direction and the frame material 21 is buckled, each of the strip plates undergoes plastic deformation and bends as shown in FIG. 3, and the body portion 20 bulges and the outer diameter of the seal material 22 expands.

  The material of the frame material 21 is not particularly limited. From the viewpoint of facilitating buckling deformation as described above, the frame material 21 is formed of a resin material such as polyethylene in view of the advantages of easy molding, rust resistance, and low cost. It is preferable to do. Further, when the anticorrosion core 2 starts to be fitted into the perforation port 11, it is preferable that the frame material 21 is made of resin from the viewpoint of easily developing elastic deformation as will be described later. The sealing material 22 is provided in an annular shape along the circumferential direction and is formed by, for example, rubber lining, but other elastic materials can also be used.

  Next, the anticorrosion method of the perforated opening using the anticorrosion core 2 is demonstrated. First, as shown in FIG. 4, the anticorrosion core 2 is brought close to the perforation port 11. The mounting jig 3 that supports the anticorrosion core 2 includes a cylindrical main body portion 31 inserted into the anticorrosion core 2 and a ring-shaped pressing portion 32 disposed above the anticorrosion core 2. A flange 31 a having an outer diameter larger than the inner diameter of the lower collar 24 is provided at the tip of the main body 31. The pressing portion 32 is screwed into a male screw formed on the outer peripheral surface on the rear end side of the main body portion 31, and the outer diameter thereof is larger than the inner diameter of the upper collar 26.

  In the natural anticorrosion core 2 shown in FIG. 4, the outer diameter of the trunk portion 20 is equal to or less than the diameter of the perforated port 11. Therefore, when the anticorrosion core 2 is fitted into the perforation port 11, it is not necessary to push the anticorrosion core 2 strongly, and the workability is excellent. In the present embodiment, the outer diameter of the body portion 20 is smaller than the diameter of the perforated port 11 in a natural state. On the other hand, the protrusion 25 protrudes outward from the end face 12 of the perforation port 11, and the outer diameter of the upper collar 26 is larger than the diameter of the perforation port 11.

  Subsequently, the mounting jig 3 is lowered with the lower arm 24 of the anticorrosion core 2 placed on the flange 31a, and the anticorrosion core 2 is fitted into the perforation port 11 as shown in FIGS. It faces the end surface 12 of the mouth 11 (internal fitting process). At this time, the pressing portion 32 of the mounting jig 3 presses the upper rod 26 of the anticorrosion core 2 from above, and the upper rod 26 abuts against the outer surface of the water pipe 10, whereby the anticorrosion core 2 is positioned in the axial direction. Is done. In the state where the internal fitting process is finished, the protrusion 25 is arranged inside the water pipe 10, and the upper rod 26 is arranged outside the water pipe 10.

  At the start of the internal fitting, the anticorrosion core 2 is fitted into the perforation port 11 while elastically deforming the front end side of the frame material 21 as shown in FIG. 5 so that the projection 25 passes through the perforation port 11. In the present embodiment, the protrusion 25 is formed with an inclined surface 25 a that is inclined toward the axial center toward the distal end side, and the protrusion 25 smoothly enters the perforation port 11 using the inclined surface 25 a. Therefore, it is not necessary to push the anticorrosion core 2 strongly into the perforation port 11, and the workability is excellent. Although the tip of the frame material 21 is deformed so as to fall inward, it may fall down outward.

  Then, as shown in FIG. 7, the body portion 31 is rotated relative to the pressing portion 32, and the flange 31 a is moved in a direction approaching the pressing portion 32, whereby the upper arm 26 of the anticorrosion core 2 is pressed. The lower bar 24 is pushed up by the flange 31a while being pressed by. By doing so, as shown in FIG. 8, the frame member 21 is buckled by applying an axial compressive force to the anticorrosion core 2, and the seal member 22 of the trunk portion 20 bulging and deforming radially outward is accordingly produced. It presses against the end surface 12 of the perforation port 11 (diameter expansion process). The frame material 21 in this state is also depicted in FIG.

  Since the frame material 21 has low rigidity due to a large number of gaps 23, it tends to undergo buckling deformation according to the compression force as described above. In particular, in the present embodiment, since a large number of strip plates extending in the axial direction constitute the frame material 21, it is easy to bulge the body portion 20 outward in the radial direction. Connecting the leading end portions of the respective strip plates with the lower collar 24 and connecting the rear end portions of the respective strip plates with the upper collar 26 is useful for uniformly generating the buckling of the frame material 21 in the circumferential direction. The front end portion of the strip plate is formed to be narrow in order to reduce the strength, and has a shape that easily causes buckling deformation.

  As shown in FIGS. 2 and 4 and the like, in the anticorrosion core 2, the frame material 21 has a barrel shape that is curved radially outward in a natural state, and each of the strip plates has a gentle bow. As a result, the frame material 21 is buckled relatively easily, and the body portion 20 is likely to bulge and deform outward in the radial direction, improving usability and improving workability effectively. In addition, such a barrel-shaped shape is useful for expressing elastic deformation on the front end side of the frame member 21 as shown in FIG.

  When the diameter expansion process is finished, the mounting jig 3 is pulled up and removed, and the anticorrosion core 2 is attached and fixed to the perforation port 11 for subsequent use of the water pipe 10. In the present embodiment, the inner diameter of the lower collar 24 increases as the frame material 21 buckles, so that the main body 31 can be pulled out as it is. Therefore, simply by operating the vertical movement of the mounting jig 3 and the rotation of the main body 31 from the state of FIG. 4, the mounting work of the anticorrosion core 2 including the internal fitting process and the diameter expanding process can be performed in series. Excellent workability.

  After the diameter expansion step, the protrusion 25 is engaged with the inner surface of the tube of the perforation port 11 to prevent the corrosion-proof core 2 from coming out. In this embodiment, when an axial compressive force is applied to the anticorrosion core 2, the protrusion 25 comes into contact with the inner surface of the tube of the perforation port 11, and the anticorrosion core 2 is attached and fixed to the perforation port 11. The anticorrosion core 2 after mounting has a stable posture because the frame material 21 is bent due to plastic deformation and receives the action of water pressure from the inside.

  The present invention is not limited to the embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the frame material 21 is buckled only by the axial compressive force, but in addition to the axial compressive force, the frame material 21 is radiated from the inside of the trunk portion 20 in the radial direction. A pressing force may be applied to the outside. In such a case, it is conceivable that the mounting jig is provided with a pressing mechanism for that purpose.

  In the above-described embodiment, an example in which the frame material 21 has the slit-shaped gap 23 is shown, but the present invention is not limited to this, and for example, a shape as shown in FIGS. FIG. 9 shows an example in which the frame material 21 has grid-like voids 27. The gap 27 has a shape that is short in the axial direction and long in the circumferential direction so that the frame material 21 is easily buckled. FIG. 10 shows an example in which the frame material 21 has a circular gap 28. It is also possible to adjust the positional relationship and the size of each gap 28 so that the frame material 21 is easily buckled.

  The present invention can be effectively used for performing anticorrosion treatment on the end face of the perforated port provided by the continuous water drilling, but is not limited to the use in the construction of the continuous water drilling.

  In the above-described embodiment, a water pipe is taken as an example of a fluid pipe, but the present invention is not limited to this, and various liquids and gases other than water, or a fluid in which a liquid and a gas are mixed are used. Applicable to fluid pipes used.

2 Corrosion-proof core 3 Mounting jig 10 Water pipe (an example of a fluid pipe)
DESCRIPTION OF SYMBOLS 11 Perforated port 12 End surface 20 The trunk | drum 21 Frame material 22 Seal material 23 Cavity 24 Lower collar 25 Projection 26 Upper collar

Claims (8)

In the anticorrosion method of the perforated port, the anticorrosion core is attached to the perforated port formed on the peripheral wall of the fluid pipe, and the end surface of the perforated port is corroded.
Using the anticorrosive core having a cylindrical body portion provided with a seal material on the outer periphery of the frame material, and the outer diameter of the body portion in the natural state is equal to or less than the diameter of the perforated port,
An internal fitting step of fitting the anticorrosion core into the perforation port, and allowing the body portion to face an end surface of the perforation port;
A diameter expansion step of buckling the frame material by applying an axial compressive force to the anticorrosion core, and pressing the sealing material of the body portion bulging and deforming radially outward with the end surface of the perforation port A method for preventing corrosion of a perforated opening.   The method for preventing corrosion of a perforated port according to claim 1, wherein the frame material is a cylindrical body having a large number of voids.   3. The perforation according to claim 2, wherein the gap is formed in a slit shape extending in the axial direction and is intermittently arranged in the circumferential direction, and the frame material is configured by a plurality of strip plates divided by the slit-like gap. Mouth protection method. Protrusions projecting radially outward are provided on the tip side of the frame material,
In the internal fitting step, the anticorrosion core is fitted into the perforation port while elastically deforming the front end side of the frame material,
The anticorrosion method for a perforation port according to any one of claims 1 to 3, wherein after the diameter expansion step, the protrusion is engaged with an inner surface of the tube of the perforation port to prevent the anticorrosion core from coming out. In the anticorrosion core that is attached to the perforation port formed in the peripheral wall of the fluid pipe and prevents the end surface of the perforation port,
A cylindrical body portion that is arranged to face the end face of the perforation port has a frame material that buckles by an axial compressive force, and a seal material that is provided on the outer periphery of the frame material,
The anticorrosion core, wherein the body portion is bulged and deformed radially outward in accordance with the buckling of the frame material, and the sealing material is pressed against the end face of the perforation port.   The anticorrosion core according to claim 5, wherein the frame material is a cylindrical body having a large number of voids.   The anticorrosion according to claim 6, wherein the gap is formed in a slit shape extending in the axial direction and is intermittently arranged in the circumferential direction, and the frame material is configured by a plurality of strip plates divided by the slit-like gap. core. The anticorrosion core according to any one of claims 5 to 7, wherein the frame material has a barrel shape that is curved radially outward in a natural state.