JP2013124721A - Rust prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rust prevention device which prevents deterioration in a rust preventive effect by maintaining a closely adhered state between a cutting groove and a rust prevention tool, and prevents the accumulation of fluid in a casing.SOLUTION: The rust prevention device 10 includes the casing 2 mounted in a hermetically-sealed state on a fluid pipe 1, and the rust prevention tool 15 fitted in a perforation 1c perforated in the fluid pipe 1 by a perforating means 9 advancing via an opening 3b of the casing 2 and preventing the rust of the perforation 1c. The rust prevention tool 15 includes a rust prevention member 16 for preventing rust by abutting over the perforation 1c, and a communication part 15c communicating with the inside of the fluid pipe 1 and the inside of the casing 2. An installation member 12 for delivering the rust prevention tool 15 toward the perforation 1c and holding the rust prevention tool 15 in such a state that the rust prevention member 16 is abutted on the perforation 1c is provided at a lid member 11 for hermetically sealing the opening 3b of the casing 2.

Description

  The present invention provides a housing that is hermetically attached to a fluid pipe, and a rust preventive that is fitted into a perforation formed in the fluid pipe by a perforating means that proceeds through an opening of the housing and prevents the perforation. And a rust preventive device.

  In a conventional rust prevention device, a part of an existing pipe (fluid pipe) is enclosed in an airtight state by a sealed case (housing), and a cutting groove is cut in the sealed case. The inside of the existing pipe is sealed by fitting a rust preventive tool formed slightly larger (see, for example, Patent Document 1).

Japanese Patent No. 4516666 (pages 7, 8 and 13)

  However, in Patent Document 1, liquid (fluid) flows out from the cutting groove into the sealed case during the rust preventive tool mounting step, and the rust preventive tool is fitted into the cutting groove in the liquid outflow state. It has become. For this reason, the rust preventive tool has a problem that the pressure from the flowing liquid is applied and the close contact state between the cutting groove and the rust preventive tool cannot be maintained, and the rust preventive effect is lowered. Further, after the rust preventive tool attaching step, there is a consideration that liquid stays between the existing pipe and the sealed case, and the staying liquid decays in the sealed case.

  The present invention has been made paying attention to such a problem, and maintains a close contact state between the cutting groove and the rust preventive tool to prevent the rust preventive effect from deteriorating, and fluid stays in the housing. It aims at providing the rust prevention apparatus which prevents this.

In order to solve the above problems, the rust preventive device of the present invention is:
A housing that is attached to the fluid pipe in a sealed manner, and a rust preventive tool that is fitted into a perforation drilled in the fluid pipe by a drilling means that proceeds through an opening of the housing and prevents the perforation. A rust prevention device comprising:
The rust preventive tool includes a rust preventive member that prevents rust by abutting over the perforations, and a communication portion that communicates within the fluid pipe and the housing,
An installation member that feeds the rust preventive tool toward the perforation to a lid member that seals the opening of the housing in a sealing manner and holds the rust preventive tool in a state where the rust preventive member is in contact with the perforation. It is characterized by being provided.
According to this feature, since the rust preventive tool includes the communication portion that communicates the inside of the fluid pipe and the inside of the casing, the inside of the fluid pipe and the inside of the casing can be set to the same pressure. Is prevented from being disturbed by the fluid pressure, and is kept in this fitted state by the installation member, so that the rust prevention effect can be prevented from being lowered. Furthermore, since the fluid can flow downstream without being retained in the housing via the communication portion, the fluid does not rot in the housing.

The rust preventive device of the present invention is
The rust preventive tool is characterized in that the rust preventive member is provided on the outer peripheral portion and an annular member having the communication portion formed on the inner peripheral portion.
According to this feature, it is possible to use the inner peripheral portion of the annular member formed in an annular shape as the communication portion without requiring a step of providing a separate communication portion in the rust preventive tool. Fluid can be communicated.

The rust preventive device of the present invention is
The rust preventive tool is detachably connected to the installation member.
According to this feature, when the rust preventive tool is deteriorated in rust preventive function due to mixing of foreign substances or the like, or deteriorated due to aging, the rust preventive tool can be appropriately replaced with a new rust preventive member.

The rust preventive device of the present invention is
A guide member that guides the installation member that feeds the rust preventive tool toward the perforation is extended on the lid member.
According to this feature, since the installation member can move along the guide member, the installation member is prevented from being tilted or rotated by the guide member, and a positional deviation with respect to the perforation occurs. The installation member can be sent out without any problems.

The rust preventive device of the present invention is
The installation member includes an operation unit that can be moved from the outside of the lid member.
According to this feature, the installation member can be operated directly from the outside of the lid member, and the rust preventive tool can be easily moved.

The rust preventive device of the present invention is
A work valve capable of closing the opening is integrally formed with the housing.
According to this feature, by operating the work valve integrated with the housing, the rust prevention device can be easily installed in an uninterrupted flow state, and a separate work attached outside from the opening. There is no need to install a valve. Further, when the perforation of the fluid pipe is reused or when the rust preventive tool is replaced, there is no need to install a separate work valve in the housing.

It is front sectional drawing which shows the drilling | piercing of the fluid pipe | tube by an end mill. It is front sectional drawing which shows the state by which the valve housing | casing was attached to the housing | casing. It is a sectional side view which shows the state in which the valve housing | casing was attached to the housing | casing. It is front sectional drawing which shows the state which obstruct | occluded the flow path of the fluid pipe | tube with the valve body. It is front sectional drawing which shows the state by which the antirust apparatus was attached to the housing | casing. It is a sectional side view which shows the state by which the antirust apparatus was attached to the housing | casing. It is front sectional drawing which shows the state which fitted the rust prevention tool to the piercing | piercing. It is a sectional side view which shows the state which fitted the rust preventive tool in the piercing | piercing.

  EMBODIMENT OF THE INVENTION The form for implementing the antirust apparatus which concerns on this invention is demonstrated below based on an Example.

  The rust preventive apparatus according to the embodiment will be described with reference to FIGS. As shown in FIG. 1, the fluid pipe 1 of the present embodiment is a metal pipe such as ductile cast iron, other cast iron, steel, etc., for water supply buried in the ground, and is formed in a substantially circular shape in cross section. The inner peripheral surface is covered with the mortar layer 1b. The fluid pipe according to the present invention may be made of vinyl chloride, polyethylene or polyolefin. Furthermore, in the present embodiment, the fluid in the fluid pipe 1 is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, in addition to industrial water, agricultural water, sewage, etc., gas or gas It may be a gas-liquid mixture of liquid and liquid.

  In this embodiment, as shown in FIGS. 2 to 4, a valve housing 13 having a valve body 14 is installed in the fluid pipe 1, and the fluid in the fluid pipe 1 is operated by operating the valve body 14. The flow path is blocked. First, the installation of the valve housing 13 in the fluid pipe 1 will be described in the order of steps.

  First, the casing 2 is attached to the outer peripheral surface 1a of the fluid pipe 1 in a sealed manner. The housing 2 is a so-called split T-shaped tube, which is disposed from above with respect to the fluid pipe 1, and covers a first case 3 that covers the upper side of the outer periphery of the fluid pipe 1 and the fluid pipe 1 from below. The second case 4 is disposed and covers the lower side of the outer periphery of the fluid pipe 1. The first case 3 and the second case 4 are made of a metal material such as cast iron. Note that the housing may have a divided structure including three or more cases. Furthermore, as long as the material of the housing is applied according to the material of the fluid pipe to which the housing is attached, various materials may be used similarly to the fluid pipe described above.

  Among these, the first case 3 is configured to abut on the outer peripheral surface 1a of the fluid pipe 1 at a part of the inner wall, and at the substantially central portion of the fluid pipe 1 of the first case 3 in the tube axis direction, A branch port 3a is formed toward the head. The branch port 3a is formed in a non-circular shape in which the width dimension facing the radial direction of the fluid pipe 1 in plan view is longer than the width dimension facing the pipe axis direction of the fluid pipe 1. An opening flange portion 3b, which is an opening portion of the present invention having a connecting function with other members, is formed at the upper end portion along the outer diameter of the branch port 3a. A plurality of bolt screw holes 3d are formed in the opening flange portion 3b at equal intervals along the circumferential direction of the opening flange portion 3b (see FIG. 3).

  As shown in FIGS. 2 and 3, the first case 3 is provided with a work valve 8 that temporarily blocks and opens the flow path of the branch port 3 a. More specifically, the first case 3 has a work valve housing portion 3e communicating with the branch port 3a. The work valve 8 is disposed in the work valve housing portion 3e in the radial direction of the branch port 3a. The working shaft 8b that is inserted through the shaft and rotatably supported, the working valve body 8a that is screwed to the working shaft 8b and that blocks the flow path of the branch port 3a, and the working shaft 8b that is exposed to the outside. And a shaft end portion 8c for rotating. A sealing ring 8d having a diameter larger than that of the branch port 3a is embedded along an annular groove formed on the upper surface of the working valve body 8a.

  Further, a pair of flanges 3 c and 3 c that face in the outer diameter direction of the fluid pipe 1 are formed so as to protrude from both ends on the circumferential side of the fluid pipe 1 in the first case 3. In addition, the seal | sticker which closely_contact | adheres to the outer peripheral surface 1a of the fluid pipe | tube 1 is arrange | positioned in the inner wall of the both ends in the pipe-axis direction of the fluid pipe | tube 1 of the 1st case 3 from the upper side. The member 3f is disposed over the entire length of the first case 3 in the circumferential direction. Similarly, on the inner peripheral surface of the first case 3, an O-ring 3g that is in close contact with the outer peripheral surface 1a of the fluid pipe 1 by arranging the first case 3 on the fluid pipe 1 from above is provided on the outer periphery of the branch port 3a. It is arrange | positioned so that it may surround along.

  On the other hand, the second case 4 is formed to have a dimension in the tube axis direction of the fluid pipe 1 that is substantially the same as that of the first case 3, and comes into contact with the outer peripheral surface 1 a of the fluid pipe 1 on the inner wall. Further, a pair of flanges 4 c and 4 c that face in the outer diameter direction of the fluid pipe 1 are formed so as to protrude from both end portions on the circumferential direction side of the fluid pipe 1 in the second case 4. Inside the flanges 4c and 4c, substantially the entire length of the fluid pipe 1 of the second case 4 extends over the entire length, and the inner walls at both ends in the tube axis direction of the fluid pipe 1 of the second case 4 are continuously attached to the second wall. Since the case 4 is disposed on the fluid pipe 1 from below, a seal member 4f that is in close contact with the outer peripheral surface 1a of the fluid pipe 1 is disposed.

  The first case 3 and the second case 4 configured as described above are configured such that the seal member 3f is formed between the outer peripheral surface 1a of the fluid pipe 1 and the first case 3 by tightening the flanges 3c and 4c with bolts and nuts. The inner wall and the seal member 4f are in close contact with the outer peripheral surface 1a of the fluid pipe 1 and the inner wall of the second case, respectively, and the seal member 4f is first inside the flanges 3c and 4c of the first case 3 and the second case 4. The first case 3 and the second case 4 are in close contact with each other over substantially the entire length of the fluid pipe 1 in the pipe axis direction. Furthermore, the casing 2 is attached to the fluid pipe 1 in a sealed manner by having both end portions on the circumferential direction side of the fluid pipe 1 of the seal member 3f in close contact with both ends on the circumferential side of the fluid pipe 1 of the seal member 4f. .

  A cutting device 9 as a drilling means according to the present invention is disposed from above in the opening flange portion 3b of the casing 2 attached to the fluid pipe 1 in a sealing manner. At the lower end portion of the cutting device 9, a flange portion 9g formed in a non-circular shape so as to follow the shape of the opening flange portion 3b is formed, and the bolt screw hole 3d of the opening flange portion 3b is formed in the flange portion 9g. A corresponding insertion hole (not shown) is formed. The opening flange portion 3b and the flange portion 9g are tightened by screwing a predetermined number of bolts 24 from the respective insertion holes toward the respective bolt screw holes 3d. An annular sealing material 9j is provided on the inner diameter side of the flange portion 9g with respect to each insertion hole, whereby the cutting device 9 is hermetically attached and fixed to the opening flange portion 3b.

  The cutting device 9 will be described in detail. As shown in FIG. 1, the cutting device 9 includes a cutting case 9d that is formed in a vertical direction and has a flange 9g at the lower end, and a fluid pipe at the upper end of the cutting case 9d. The rail 9e provided horizontally in the transverse direction 1, the slide base 9f that can slide on the rail 9e while sealing the upper end of the cutting case 9d, and the upper end pivotally supported by the slide base 9f. And a shaft member 9a that is connected to driving means (not shown) provided at the upper end of the slide base 9f and that travels in the axial direction from the cutting case 9d toward the fluid pipe 1 in the branch port 3a. And the end mill 9b connected to the lower end of the shaft member 9a, and the shaft member 9a and the end mill 9b can be moved horizontally across the fluid pipe 1 by operating from the outside of the cutting device 9. And Ndoringu portion 9c, and a. Of these, the end mill 9b is a perforated shaft having a cylindrical shape and provided with cutting blades on the bottom and side surfaces thereof, and is rotated around the shaft member 9a by the driving means. Can be cut.

  Further, a communication port 9h is formed through the cutting case 9d toward the outside. The communication valve 7 is connected to the communication port 9h in a sealed manner from the outside of the cutting case 9d. This communication valve 7 is provided with a valve body (not shown) that allows the inside and outside of the cutting case 9d to communicate with each other through the communication port 9h when the operator operates the lever 7a.

  The cutting device 9 advances the end mill 9b toward the fluid pipe 1 through the shaft member 9a in the axial direction of the shaft member 9a, whereby the upper end of the fluid pipe 1 is cut by the cutting blade at the bottom of the end mill 9b in the housing 2. Cut a part of the part. At the time of this cutting, by opening the valve body of the communication valve 7, the chips generated at the time of cutting are discharged out of the housing 2 and the cutting case 9d.

  Then, after the upper end of the fluid pipe 1 is cut by a predetermined amount with the cutting blade at the bottom of the end mill 9b and penetrated, the operator operates the handling part 9c so that the slide base 9f is moved along the rail 9e to the fluid pipe 1 Move horizontally in the cross direction. By the slide movement of the slide base 9f, the end mill 9b is maintained in the height position and horizontally moved so as to cross the fluid pipe 1 with the width dimension of the branch port 3a as a limit, and the fluid is cut by the cutting blade on the side surface of the end mill 9b. The tube 1 is cut. As described above, after the end mill 9b is advanced in the axial direction of the shaft member 9a toward the fluid pipe 1 through the shaft member 9a, the fluid pipe 1 is moved by the handling portion 9c while maintaining the height position of the end mill 9b. By horizontally moving so as to cross, a perforation 1c (see FIGS. 2 and 3) whose width in the tube diameter direction is longer than that in the tube axis direction is formed in the upper portion of the fluid pipe 1.

  After the perforation 1c is formed by the end mill 9b in this way, the shaft member 9a and the end mill 9b are retracted from the inside of the housing 2, and the work valve 8 is operated to temporarily seal the branch port 3a. The procedure for sealing the branch port 3a with the work valve 8 is to rotate about the axis at the position where the work shaft 8b is installed by attaching a tool (not shown) to the shaft end 8c and rotating the tool about the axis. The rotation of the work shaft 8b around the axis causes the work valve element 8a to move from the work valve housing 8e into the branch port 3a along the work shaft 8b, and eventually shuts off the flow path of the branch port 3a. In a state where the flow path of the branch port 3a is blocked by the work valve body 8a, the annular ring 8d abuts against the tube wall constituting the branch port 3a, and the pipe wall and the work valve body are caused by the fluid pressure in the fluid pipe 1. By being narrowed to 8a, it is cut off in a sealed manner.

  Although not particularly shown, a brush as a cleaning means is attached to the shaft member 9a in place of the end mill 9b, the work valve 8 is operated to open the branch port 3a, and the shaft member 9a and the brush are directed to the perforation 1c. Advancing and horizontally moving the brush in the radial direction of the fluid pipe 1 by operating the handling part 9c while rotating the brush by the driving means, thereby removing impurities such as chips adhering to the cutting surface of the perforation 1c. To do.

  After the contaminants are removed from the perforations 1c by the brush, the shaft member 9a and the brush are retracted from the inside of the housing 2 and the work valve 8 is operated to temporarily seal the branch port 3a. And while removing the volt | bolt 24 once and removing the cutting device 9 from the opening flange part 3b, as shown in FIG.2 and FIG.3, as shown in FIG.2 and FIG.3, the valve | bulb for interrupting | blocking or open | releases the conduit | pipe of the fluid pipe | tube 1 beforehand The valve housing 13 in which the body 14 is disposed is installed in the opening flange portion 3b. An insertion hole 13j corresponding to the bolt screw hole 3d of the opening flange portion 3b is formed at the lower end of the valve housing 13, and a bolt 24 is screwed into each bolt screw hole 3d from the insertion hole 13j and tightened. At the same time, since an annular sealing ring 13h is interposed in the gap between the valve housing 13 and the opening flange portion 3b, it is connected in a sealed manner.

  The rotating screw 13d is rotatably attached to an insertion hole (not shown) formed in the top of the valve housing 13 so that the upper end protrudes outside the valve housing 13. The pressing plate 13e is fixed to the upper end surface of the valve housing 13 with a bolt, and prevents the rotation screw 13d from being pulled out from the insertion hole. With the above configuration, the rotating screw 13d is rotatable in both forward and reverse directions with respect to the valve housing 13, but does not move up and down. Reference numeral 13f denotes a screw portion having a circumferential surface screwed over substantially the entire length except for the upper end portion of the rotating screw 13d.

  The screw top 13g is fitted into a guide groove 14a formed at the upper end portion of the valve body 14, and is screwed into the screw portion 13f, and the rotation of the rotation operation portion 13b formed at the upper end portion of the rotary screw 13d. Accordingly, by rotating the screw portion 13f, the valve element 14 can move up and down following the screw top 13g screwed along the screw portion 13f. The valve body 14 is formed with an insertion hole 14b into which the screw portion 13f of the rotary screw 13d is inserted.

  Thereafter, as shown in FIG. 4, the valve body 14 moves downward by the rotation of the rotation operation portion 13 b by a handle (not shown), thereby elastically deforming the inner peripheral surface of the fluid pipe 1 and sealingly contacting the fluid pipe 1. The pipe of the fluid pipe 1 is opened by shutting off the pipe 1 and moving upward by the rotation of the rotation operation portion 13b by the handle. In addition, when the valve body 14 is elastically deformed so as to block the conduit of the fluid pipe 1, the valve body 14 comes into close contact with the cutting surface of the perforation 1 c to prevent the cutting of the fluid pipe 1 more reliably while preventing rust. Shut off the pipeline.

  As described above, in a state where the conduit of the fluid pipe 1 is blocked by the valve body 14, a predetermined operation such as replacement of the fluid pipe can be performed on the downstream side or the upstream side of the blocking portion. Then, after performing the predetermined work, the valve body 14 is retracted into the valve housing 13, the work valve 8 is operated to temporarily seal the branch port 3a, and the bolt hole 13j and the bolt screw hole 3d are bolted. By removing 24 and removing the valve body 14 together with the valve housing 13 from the opening flange portion 3b, the operation of blocking the fluid flow path in the fluid pipe 1 by the valve body 14 is completed.

  Thus, after the valve housing 13 is removed from the opening flange portion 3b, a rust preventive operation is performed to rust the exposed cut surface of the perforation 1c using the rust preventive device 10 of the present invention described later. Is done.

  The rust prevention device 10 will be described with reference to FIGS. 5 to 8. The rust prevention device 10 includes a lid member 11 that is installed in a sealed manner with respect to the casing 2 and the opening flange portion 3 b of the casing 2. An installation member 12 inserted through the lid member 11 so as to be able to advance and retreat toward the perforation 1c, a rust preventer 15 connected to the tip of the installation member 12 and fitted in the perforation 1c to rust the perforation 1c; Consists mainly of.

  First, as shown in FIG. 6, the lid member 11 will be described. The lid member 11 has connection holes 11a corresponding to the respective bolt screw holes 3d of the opening flange portion 3b. An annular seal member 18 is provided on the surface on the opening flange portion 3b side. The annular seal member 18 has a diameter slightly larger than the outer diameter of the inner peripheral surface of the branch port 3a. The bolts 24 are inserted into the bolt screw holes 3d and the connection holes 11a, respectively, and tightened so that the opening flange portion 3b and the lid member 11 are connected in a sealed manner via the seal member 18.

  A through hole 11c that penetrates from the outside in the axial direction of the branch port 3a is formed at the center of the lid member 11, and annular seal rings 11f and 11f are formed on the inner peripheral surface of the through hole 11c. Two through-holes 11c are provided apart from each other in the axial direction. Note that the seal ring is not limited to being provided at two locations apart in the extending direction of the through hole, but may be provided at one location or three or more locations, or provided substantially over the entire surface of the through hole. May be.

  Further, four support screw holes 11d are provided on the upper surface of the lid member 11 so as to surround the periphery of the through hole 11c, and the lower end of the substantially cylindrical guide member 17 is provided in the support screw hole 11d. Each part is screwed. That is, four of these guide members 17 are erected upward from the upper surface of the lid member 11. In addition, this guide member is not restricted to standing on a cover member, For example, it may be externally fitted by the housing | casing and may be provided separately, and the number of guide members is not necessarily limited to four. It may be -3 or 5 or more.

  Similarly, on the upper surface of the lid member 11, holding screw holes 11e and 11e serving as holding positions for a holding portion 12d to be described later are separated from the through hole 11c in the radial direction of the hole 1c, and each supporting screw hole 11d is avoided. It is screwed at the position. A concave storage recess 11b that can communicate with the inside of the housing 2 via the branch port 3a and store a part of the rust prevention tool 15 is formed on the lower surface of the lid member 11. Specifically, in the initial state where the rust preventive device 10 is installed, the rust preventive tool 15 is housed in the space above the work valve body 8a in the branch port 3a and the housing recess 11b.

  Next, the installation member 12 will be described. The installation member 12 has a shaft portion 12a that is inserted into the through hole 11c and is disposed so as to be able to advance and retreat toward the perforation 1c. The shaft portion 12a has a lower end portion. A convex portion 12b that protrudes in the direction of travel is formed, and a holding portion 12d that holds the position of the installation member 12 is formed at the upper end portion.

  The shaft portion 12a extends in the vertical direction, which is the same direction as each guide member 17, and the axial dimension is set corresponding to the size from the storage recess 11b to the perforation 1c through the branch port 3a. At the same time, it slides on the seal rings 11f and 11f of the through-hole 11c and moves forward toward the perforation 1c while keeping the seal. In this way, the shaft portion 12a is separated in the extending direction of the through-hole 11c and slides on the seal rings 11f and 11f provided at two locations, thereby preventing the installation member 12 from tilting and guiding it in the insertion direction. In addition, the sealing performance can be improved. The convex portion 12b has a diameter smaller than that of the intermediate portion of the shaft portion 12a and protrudes in the axial direction. The convex portion 12b is formed in a rectangular shape when viewed in the axial direction, and a locking screw hole 12c is formed in the axial direction from the end surface. Has been.

  The holding portion 12d extends from the upper end portion of the shaft portion 12a toward the holding screw holes 11e and 11e, and holding portions corresponding to the holding screw holes 11e and 11e are provided at both ends of the holding portion 12d. Holes 12f and 12f are formed. Further, the holding portion 12 d extends in the outer diameter direction of the through hole 11 c and can be locked to the outer surface of the lid member 11. That is, it is prevented that the shaft portion 12a is excessively inserted when moving forward toward the perforation 1c.

  Further, an operation screw hole 12e is formed in the holding portion 12d so as to penetrate in the same direction as the tube axis direction of the fluid pipe 1. On the both sides of the operation screw hole 12e, the outer side of the lid member 11 is provided. Bar-like operation portions 19 and 19 capable of moving the installation member 12 from the side are screwed and connected. That is, the operation parts 19 and 19 are substantially linear and orthogonal to the extending direction of the holding part 12d, and the holding part 12d and the operation parts 19 and 19 have a substantially cross shape in plan view. Both end portions of the operation portions 19 and 19 and the holding portion 12d are disposed in the gaps between the adjacent guide members 17 and 17 on both sides, and the rotation around the shaft portion 12a of the installation member 12 is guided by each guide. It is installed in a state regulated by the member 17.

  Next, the rust preventive tool 15 will be described. The rust preventive tool 15 includes an annular member 15a formed in a substantially annular shape along the perforation 1c, and the upper end portion of the annular member 15a is stretched in the outer diameter direction. A locking portion 15b is formed. The rust preventive tool 15 is provided on the outer peripheral surface of the annular member 15a and the lower surface of the locking portion 15b, and the rust preventive member 16 prevents rust by abutting over the perforated 1c where the metal base of the metal pipe is exposed. It has.

  As described above, the annular member 15a is formed in a substantially annular shape along the perforation 1c, so that the inner peripheral portion of the annular member 15a in plan view is a communication portion 15c communicating in the axial direction. In the fluid pipe 1 and the housing 2, the communication portion 15c formed on the inner peripheral portion of the annular member 15a formed in an annular shape is not required without providing a step of providing a separate communication portion in the rust preventive tool 15. And fluid can be communicated with each other.

  The annular member 15a is provided with a single beam portion 15d extending across the communication portion 15c in the tube axis direction of the fluid tube 1 in plan view. A rectangular fitting hole (not shown) that fits the convex portion 12b of the installation member 12 is formed in the beam portion 15d so as to penetrate in the axial direction of the annular member 15a. The rust preventive tool 15 can be detachably connected to the installation member 12 by fitting the projection 12b into the fitting hole (not shown) and screwing the locking screw 12j into the locking screw hole 12c. it can. As a result, when the rust prevention tool 15 is deteriorated in rust prevention function due to mixing of foreign substances or the like, or deteriorated due to aging, the rust prevention tool 15 can be appropriately replaced with a new rust prevention member. Moreover, since the fitting hole of the convex part 12 b and the beam part 15 d is formed in a rectangular shape, the rust preventive tool 15 can be positioned in the circumferential direction with respect to the installation member 12. In addition, the convex part and the said fitting hole which mutually fit should just be formed in the non-circular shape which can position a rust preventive tool in the circumferential direction.

  Furthermore, the latching | locking part 15b is formed larger diameter than the piercing | piercing 1c by projecting in the outer-diameter direction from the upper end part of the cyclic | annular member 15a. Note that the rust prevention member 16 is formed of a member made of a flexible material that is relatively easily elastically deformed, for example, made of rubber, synthetic resin, or the like. It is fixed over the lower surface.

  After the rust prevention device 10 configured in this manner is attached in a sealed manner to the opening flange portion 3b, the work valve 8 is operated to open the branch port 3a. Then, by pressing the operation units 19 and 19 from above toward the perforation 1c, the installation member 12 moves forward while being prevented from being tilted or rotated by the respective guide members 17. Thus, by providing the operation parts 19, 19, the operation parts 19, 19 can be directly gripped from the outside of the lid member 11 and the installation member 12 can be operated. Is easy. Further, since the installation member 12 can move along the guide member 17, the installation member 12 is prevented from being tilted or rotated, and the perforation 1c formed in the curved surface shape is prevented. The installation member 12 can be sent out without causing the displacement of the rust tool 15.

  As the installation member 12 moves forward, the rust preventive tool 15 also moves, and eventually the rust preventive tool 15 is fitted into the perforation 1c. At this time, as the annular member 15a is introduced into the perforation 1c, the rust preventive member 16 is gradually slid while being narrowly pressed between the annular member 15a and the cutting surface of the perforation 1c. It is elastically deformed to cover the cutting surface of the perforation 1c, and the locking portion 15b eventually locks to the outer surface of the fluid pipe 1 in the outer diameter direction from the perforation 1c.

  As described above, the axial dimension of the shaft portion 12a in the installation member 12 is set in accordance with the moving dimension from the housing recess 11b of the rust preventive tool 15 to the perforation 1c. The holding portion 12 d is in contact with the outer surface of the lid member 11. In this state, the communication portion 15 c of the annular member 15 a communicates with the fluid pipe 1 and the housing 2, whereby the perforation 1 c enters the housing 2 via the communication portion 15 c of the rust preventive tool 15. By allowing the fluid to actively flow out, the fluid pipe 1 and the housing 2 can be brought to substantially the same pressure, so that the contact state between the perforation 1c and the rust preventive tool 15 is hindered by fluctuations in the fluid pressure, It can prevent that a rust prevention effect falls. Furthermore, since the fluid can flow in the fluid pipe 1 through the communication portion 15 c without staying in the housing 2, the fluid does not rot in the housing 2.

  Then, the holding screw holes 11e and 11e of the lid member 11 and the holding holes 12f and 12f of the holding portion 12d are aligned, and the holding bolt 12g is screwed into each. Thus, the state in which the rust preventive tool 15 is fitted in the perforation 1c is maintained. Thus, the rust preventive effect is continued by the installation member 12 holding the rust preventive member 16 and the perforations 1c in close contact.

  And by removing the operation parts 19 and 19 and each guide member 17 from the rust prevention apparatus 10, the rust prevention work of the cutting surface of the drilling 1c is complete | finished.

  As described above, the rust preventive device 10 according to the present invention includes the housing 2 attached in a sealed manner to the fluid tube 1 and the cutting device 9 that travels through the opening flange portion 3b of the housing 2. A rust preventive tool 15 that is fitted into the perforated hole 1c and prevents the perforated hole 1c from being rusted. The rust preventive tool 15 is sent out to the perforation 1c to the lid member 11 that includes the fluid pipe 1 and the communication portion 15c communicating with the inside of the housing 2 and seals the opening flange portion 3b of the housing 2 in a sealing manner. The installation member 12 for holding the rust preventive tool 15 in a state where the rust preventive member 16 is in contact with the perforation 1c is provided. According to this, since the rust preventive tool 15 includes the communication portion 15c that allows the fluid pipe 1 and the housing 2 to communicate with each other, the fluid pipe 1 and the housing 2 can have the same pressure. Therefore, the fact that the fitted state between the perforated 1c and the rust preventive tool 15 is obstructed by the fluid pressure is eliminated, and the fitted state is maintained by the installation member 12, so that the rust preventing effect is reduced. Can be prevented. Furthermore, since the fluid can flow downstream without staying in the housing 2 via the communication portion 15 c, the fluid does not rot in the housing 2.

  In addition, a work valve 8 capable of closing the opening flange portion 3b is integrally formed with the housing 2. By operating the work valve 8 integrated with the housing 2, the cutting device 9 and the rust preventive are provided. The apparatus 10 and the like can be easily installed or removed in an uninterrupted state, and there is no need to attach a separate work valve attached above the branch port 3a. Further, when the perforation 1c of the fluid pipe 1 is reused or when the rust preventive tool 15 is replaced, it is not necessary to newly install a separate work valve in the housing.

  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 this embodiment, the end mill 9b is formed in the horizontal direction by moving the end mill 9b in the horizontal direction with the width dimension facing the radial direction of the fluid pipe 1 of the branch port 3a. The present invention is not necessarily limited to this embodiment, and for example, it may be drilled in the circumferential direction of the fluid pipe. Further, the drilling means for drilling the fluid pipe 1 is not limited to the end mill 9b, but is, for example, a substantially cylindrical hole saw connected to the lower end portion of the shaft member and rotated around the shaft member by driving of the drive means. There may be.

  Further, in the above embodiment, the valve body 14 moves downward by the rotation of the rotation operation portion 13b by a handle (not shown) so that the valve body 14 abuts in a sealed manner while elastically deforming the inner peripheral surface of the fluid pipe 1. The switch body is described as a switching valve that opens the conduit of the fluid pipe 1 by moving upward by the rotation of the rotation operation unit 13b by the handle, but the valve body includes a butterfly valve, a gate valve, a plug It may be an emergency shutoff valve or the like.

  In the above embodiment, the communication portion 15c is formed on the inner peripheral portion of the annular member 15a formed in an annular shape. However, the present invention is not limited to this, and for example, a plurality of communication portions are formed in a member that covers the entire perforation. You may make it install.

1 Fluid Pipe 1c Perforation 2 Housing 3b Opening Flange (Opening)
8 Work valve 9 Cutting device 9b End mill 10 Rust prevention device 11 Lid member 12 Installation member 12d Holding portion 13 Valve housing 14 Valve body 15 Rust prevention tool 15a Ring member 15c Communication portion 16 Rust prevention member 17 Guide member 19 Operation portion

Claims (6)

A housing that is attached to the fluid pipe in a sealed manner, and a rust preventive tool that is fitted into a perforation drilled in the fluid pipe by a drilling means that proceeds through an opening of the housing and prevents the perforation. A rust prevention device comprising:
The rust preventive tool includes a rust preventive member that prevents rust by abutting over the perforations, and a communication portion that communicates within the fluid pipe and the housing,
An installation member that feeds the rust preventive tool toward the perforation to a lid member that seals the opening of the housing in a sealing manner and holds the rust preventive tool in a state where the rust preventive member is in contact with the perforation. A rust preventive device characterized by that.   2. The rust preventive tool according to claim 1, wherein the rust preventive tool has an annular member in which the rust preventive member is provided on an outer peripheral portion and the communication portion is formed on an inner peripheral portion. apparatus.   The rust preventive device according to claim 1, wherein the rust preventive tool is detachably connected to the installation member.   The rust prevention apparatus according to any one of claims 1 to 3, wherein a guide member that guides the installation member that sends the rust prevention tool toward the perforation is extended on the lid member.   The rust prevention apparatus according to any one of claims 1 to 4, wherein the installation member includes an operation unit that can be moved from outside the lid member.   The rust preventive device according to any one of claims 1 to 5, wherein a work valve capable of closing the opening is integrally formed with the casing.

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