JP5541988B2 - Rust prevention device - Google Patents

Description

  The present invention includes a housing in which an existing fluid pipe is sealed, a valve body that can open and close the inside of the housing, a work case that is connected to the housing in a sealed manner via the valve body, An annular rust-proof cover disposed on the pipe, and an existing fluid pipe that holds the rust-proof cover and moves between a predetermined position in the work case and the housing, and is cut in an undisturbed state in the housing. The present invention relates to a rust preventive apparatus including a rust preventive operation body that rusts a cut surface by abutting and holding a rust preventive cover on the cut surface.

  Conventionally, as a cover mounting machine (rust prevention device) that prevents rust of a cut surface by mounting a rust preventive cover on the cut surface of an existing fluid pipe that has been cut in an uninterrupted flow state, A cover holding part for holding the rust cover and a fluid pressure cylinder for pressing the cover holding part are provided, and the cover holding part is cut by the fluid pressure cylinder from the cover mounting machine arranged between the cutting remaining pipe parts. Press against the cutting surface of the remaining tube portion, insert the cutting surface of the remaining cutting tube portion into the annular recess of the anticorrosion cover, and attach the elastic seal protrusion provided in the annular recess to the remaining cutting tube portion There is one in which rust prevention is performed on the cut surface of the remaining cutting pipe portion by pressing (see, for example, Patent Document 1).

JP 2009-8120 A (page 13, FIG. 9)

  However, in Patent Document 1, when the fluid pressure cylinder is pulled back in the direction away from the cut surface of the remaining cutting tube portion after the cut surface of the remaining cutting tube portion is inserted into the annular recess, the antirust cover and the cover are covered. When the frictional force generated between the holding part and the elastic seal protrusion works against the frictional force generated by the elastic seal protrusion being pressed against the remaining cutting pipe part, the rust-proof cover is attached as the fluid pressure cylinder is pulled back. There is a problem in that it is pulled back from the cut surface while being held in the cover holding part, and it takes time and effort to stably maintain the contact and holding of the anticorrosive cover with respect to the cut surface.

  The present invention has been made paying attention to such problems, and stably and easily maintains the rust-proof cover in contact with the cut surface while preventing the rust-proof cover from being detached from the cut surface. An object of the present invention is to provide an anti-corrosion device that can be used.

In order to solve the above problems, the rust preventive device of the present invention is:
A housing in which an existing fluid pipe is sealed, a valve body capable of opening and closing the inside of the housing, a work case connected in a sealed manner to the housing via the valve body, and in the housing A rust-proof cover that rusts the cut surface of the existing fluid pipe that has been cut in an uninterrupted state, and holds the rust-proof cover and moves between a predetermined arrangement position in the work case and the housing. And a rust preventive device for holding the rust preventive cover in contact with the cut surface in the housing, and a rust preventive device comprising:
The casing includes a locking portion disposed along the outer surface of the existing fluid pipe by the casing sealing the existing fluid pipe, and the rust-proof cover rusts the cut surface. And a locked portion that is locked to the locking portion and held in contact with the cut surface.
According to this feature, not only can the housing seal the existing fluid pipe, but the locking portion can be easily disposed along the outer surface of the existing fluid pipe. Since it is firmly held against the housing, it prevents the rust cover from coming off from the cut surface while the rust cover is pulled away from the cut surface. The holding can be stably maintained.

The rust preventive device of the present invention is
The rust-proof operating body includes a holding part that detachably holds the rust-proof cover, a moving part that moves the holding part between the arrangement position and the cutting surface, and the holding part at the arrangement position. And an urging portion that urges toward the head.
According to this feature, after the moving unit moves the holding unit holding the rust preventive cover from the arrangement position to the cut surface, the moving unit can be easily returned to the arrangement position by urging the urging unit.

The rust preventive device of the present invention is
The locked portion is locked using the elastic force of the locking portion as a locking force.
According to this feature, the locking force for the rust-proof cover can be optimized by appropriately adjusting the elastic force of the locking portion.

The rust preventive device of the present invention is
The locked portion is locked using the outer surface of the existing fluid pipe as a reaction force of elastic deformation of the locking portion.
According to this feature, by using the outer surface of the existing fluid pipe as a reaction force for elastic deformation of the locking portion, it is possible to maintain the locking force for the rust-proof cover without using a special member.

It is a plane sectional view showing the existing fluid pipe in an example. It is side surface sectional drawing which shows the attachment of the housing | casing to the existing fluid pipe | tube. (A) is front sectional drawing which shows the existing fluid pipe | tube with which the housing | casing was attached, (b) is AA sectional drawing in Fig.3 (a). It is a side view of the partial cross section which shows the state by which the work case was attached to the housing | casing via the valve body. It is front sectional drawing which shows the state by which the rust prevention operation body was arrange | positioned in the housing | casing. It is a plane sectional view showing the state where a rust prevention operation object is arranged in a case. (A) is a rear view which shows a core, (b) is BB sectional drawing in Fig.7 (a), (c) is CC sectional drawing in Fig.7 (a). . (A) is a side view which shows a rust prevention operation body, (b) is side sectional drawing of a rust prevention operation body. It is a top sectional view showing the state where the core is brought into contact with the cut surface of the fluid pipe. It is a top sectional view showing the state where the holding part was moved from the movement position to the storage position. (A) is sectional drawing which shows the state which arranged the core facing the cut surface, (b) is sectional drawing which shows the state which made the core contact | abut to a cut surface. It is a side view of the partial cross section which shows the state which inserted and arranged the control valve in the housing | casing. It is sectional drawing which shows the latching metal fitting as a 1st modification. It is sectional drawing which shows the latching metal fitting as a 2nd modification.

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

  A rust preventive apparatus according to an embodiment will be described with reference to FIGS. In this embodiment, the direction facing the cut surface of the existing fluid pipe of the rust prevention cover is the front side (front side) of the rust prevention cover, and the direction orthogonal to the pipe axis direction of the existing fluid pipe in the horizontal direction is prevented. It demonstrates as a left-right width direction of a rust cover.

  As shown in FIG. 1, the existing fluid pipe 1 of the present embodiment is a metal pipe water pipe formed in a substantially circular shape in cross-section in which water as a fluid flows, for example, and has an inner peripheral surface. Covered with a mortar layer. As shown in FIG. 12, in order to provide a new flow control valve 15 in the existing fluid pipe 1, a predetermined portion is cut by a cutting tool such as a hole saw (not shown).

  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 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 existing fluid pipe 1 is clean water, but the fluid flowing in the existing fluid pipe 1 is not necessarily limited to clean water, and may be, for example, industrial water, It may be a fluid pipe through which a fluid in a gas-liquid mixed state flows.

  As shown in FIGS. 1 and 2, first, the existing fluid pipe 1 includes a housing 2 fixedly attached to the outer peripheral surface 1 b of the existing fluid pipe 1 in order to seal the existing fluid pipe 1 in a watertight manner, There are provided push wheels (not shown) attached to both ends of the existing fluid pipe 1 in the pipe axis direction in a watertight manner.

  The casing 2 is a so-called split T-shaped tube, and includes a branch pipe 2b having an inner space in the vertical direction substantially orthogonal to the pipe axis of the existing fluid pipe 1, and a lower surface of the outer peripheral surface 1b of the existing fluid pipe 1. The cover 2c covering the side, and the flange 2d formed on the left and right sides of the branch pipe 2b and the flange 2e formed on the left and right sides of the cover 2c are substantially the same as the tube axis of the existing fluid pipe 1. The existing fluid pipe 1 is sealed in a watertight manner by tightening in the vertical position and attaching the above-described push wheel (not shown) from the pipe axis direction of the existing fluid pipe 1 to both ends of the casing 2 on the pipe axis direction side of the existing fluid pipe 1. doing.

  As shown in FIGS. 2, 3A and 3B, the outer peripheral surface 1b of the existing fluid pipe 1 is interposed between the branch pipe 2b and the cover 2c and the outer peripheral surface 1b of the existing fluid pipe 1, respectively. The latch metal fittings 11 and 11 as a latching | locking part in this invention are arrange | positioned along. Each locking metal fitting 11 is made of stainless spring steel or the like having elasticity and anticorrosion, and is formed in a substantially semicircular arc shape when viewed from the front. As shown in FIG. By arranging the respective end portions of the locking metal fittings 11 and 11 to face each other, they are arranged along substantially the entire circumference of the existing fluid pipe 1 in a front view. Each locking metal fitting 11 has a vertical surface described above by a screw 17 inserted through a through hole 11f formed in the fixing piece 11a through a pair of fixing pieces 11a extending along the vertical surface of the branch pipe 2b or the cover 2c. Are fixed to the branch pipe 2b or the cover 2c.

  Further, these locking metal fittings 11 are provided with a pair of extending pieces 11 b extending toward the outer side in the tube axis direction of the existing fluid pipe 1 of the housing 2. The distal end portions of these extending pieces 11b are formed in a bent portion 11c bent toward the branch pipe 2b or cover 2c side and the existing fluid pipe 1 side.

  These bent portions 11c are formed by attaching the branch pipe 2b and the cover 2c to the existing fluid pipe 1, so that the outer circumference of the branch pipe 2b and the existing fluid pipe 1 or between the cover 2c and the existing fluid pipe 1 is obtained. It abuts on the branch pipe 2b and the existing fluid pipe 1 or the cover 2c and the existing fluid pipe 1 while being elastically deformed with the 1b. For this reason, each locking fitting 11 is screwed to the vertical surface of the branch pipe 2b or the cover 2c of the fixing piece 11a, the branch pipe 2b of the bent portion 11c and the outer peripheral surface 1b of the existing fluid pipe 1, or the cover 2c. The friction force generated by the contact of the existing fluid pipe 1 with the outer peripheral surface 1b prevents the existing fluid pipe 1 from rotating around the pipe axis and moving in the pipe axis direction.

  Further, each locking fitting 11 has a pair of extending pieces 11 d extending toward the inner side in the tube axis direction of the existing fluid pipe 1 of the housing 2. The end portions of these extended pieces 11d are formed in a bent portion 11e bent toward the branch pipe 2b or the cover 2c side and the existing fluid pipe 1 side, and abut against the outer peripheral surface 1b of the existing fluid pipe 1. ing.

  As shown in FIG. 4, the upper end of the branch pipe 2b of the casing 2 attached to the existing fluid pipe 1 is opened and closed inside the casing 2 by sliding in the horizontal direction as shown in FIG. The partition part 3 provided with the valve body 3a which can be freely attached is attached watertight.

  A work housing provided with a hole saw (not shown) is attached to the upper end of the partition part 3 in a watertight manner, and the hole saw is moved downward with the valve body 3a opened, so that the existing fluid pipe 1 is kept in an uninterrupted state. Disconnect. Therefore, the cut surfaces 1a and 1a of the existing fluid pipe 1 are formed in an arc shape in plan view by being cut by the hole saw (see FIG. 6).

  After the existing fluid pipe 1 is cut, the valve body 3a is closed after the hole saw and the cut piece of the existing fluid pipe 1 are accommodated in the work casing, and the work casing is removed from the partition portion 3 to remove the existing fluid pipe 1 End the cutting work. At this time, the existing fluid pipe 1 is sealed in a watertight manner by the housing 2 and the partition part 3 in a cut state. Thereafter, in the present embodiment, the cut surfaces 1a and 1a of the existing fluid pipe 1 cut in the casing 2 in this way are rust-prevented in an undisturbed state.

  As shown in FIG. 4, a work case 4 is attached to the upper end portion of the partition portion 3 in a watertight manner. In the work case 4, rust prevention covers 5 and 5 for rusting the cut surfaces 1 a and 1 a of the existing fluid pipe 1 are arranged in a state of being held by the rust prevention operation body 6. Further, a through hole 4a is formed in the upper center portion of the work case 4 so as to face in the vertical direction.

  Furthermore, the upper end of the work case 4 is provided with a cylindrical body 7a facing upward and downward, and an operation rod 7b inserted and disposed in the cylindrical body 7a. The operation rod 7b is rotatable in the horizontal direction within the cylinder 7a, and a packing (not shown) is provided at the upper end of the inner peripheral surface of the cylinder 7a. The portion and the operating rod 7b are kept watertight. Moreover, the cylindrical body 7a is inserted and disposed in the work case 4 through the through hole 4a, and the rust preventive operating body 6 is suspended at the lower end. In addition, packing which is not illustrated is provided between the cylinder 7a and the through-hole 4a, and between the cylinder 7a and the through-hole 4a is kept watertight.

  As shown in FIGS. 5 and 6 from this state, the user presses the cylinder 7a downward together with the operation rod 7b after opening the valve body 3a, thereby preventing the rust-proof operation body 6 from holding. The rust covers 5 and 5 are arranged at positions facing the cut surfaces 1 a and 1 a of the existing fluid pipe 1.

  As shown in FIG. 8A and FIG. 8B, the rust preventive operating body 6 is held by a pair of holding portions 8 and 8 into which the rust preventive cover 5 is inserted and held, and horizontally rotated. A rotating body 12 as a moving part in the present invention that presses the parts 8 and 8 and moves both holding parts 8 and 8 toward the cut surfaces 1a and 1a of the existing fluid pipe 1, and the rotating body 12 is provided inside. It comprises a guide portion 10 for guiding the movement of both holding portions 8, 8 to the cut surfaces 1a, 1a. The pair of holding portions 8 and 8, the rotating body 12, and the guide portion 10 are provided substantially symmetrically with respect to the left and right sides of the operation rod 7 b as a center. To do.

  The guide part 10 is formed in a frame shape whose central axis faces the same direction as the pipe axis direction of the existing fluid pipe 1. A pair of upper and lower key grooves 10a are formed at the end on the central axis direction side of the inner peripheral surface of the guide portion 10 toward the outer side in the central axis direction of the guide portion 10. Further, a leg portion 10b that comes into contact with the bottom surface in the cover 2c is provided at the lower portion of the end portion on the central axis direction side of the guide portion 10 in order to dispose the rust prevention operation body 6 in the housing 2. A rubber piece 10g is attached to the bottom surface of the leg 10b.

  Further, as shown in FIGS. 6 and 8A, a pair of guide pieces 10f, 10f facing the left-right width direction of the guide portion 10 are provided at the lower end portions on the outer sides in the left-right width direction of the guide portion 10, respectively. 10 opposite to the central axis direction.

  On the other hand, as shown in FIGS. 5 and 6, on the inner side surface of the housing 2 on the side in the left-right width direction, the guide protrusion 2 a extends from the branch pipe 2 b to the cover 2 c so as to face the central axis direction of the guide portion 10. Is provided. The width dimension of the guide protrusion 2a on the side of the central axis direction of the guide portion 10 is shorter than the width dimension between the opposing side surfaces between the two guide pieces 10f, 10f, and the rust prevention cover 5 is provided. When the guide rib 2a is disposed between the two guide pieces 10f and 10f when the fluid pipe 1 is disposed at a position facing the cut surface 1a, the leg portion 10b of the rust preventive operating body 6 is attached to the existing fluid pipe 1. It can be brought into contact with the bottom surface in the cover 2c without being affected by the fluid flowing inside.

  As shown in FIG. 8B, through holes 10 d and 10 e that are substantially coaxial and face in the vertical direction are formed in the upper and lower portions of the center of the guide portion 10. The lower part of the operation rod 7b is inserted and arranged in the guide part 10 through these through holes 10d and 10e. In addition, the cylindrical body 7a suspends the guide part 10 by connecting a lower end part to the upper end part of the guide part 10 with a volt | bolt. Furthermore, the lower end portion of the operating rod 7b is disposed below the guide portion 10 through the through hole 10e, and the bolt 13 is screwed to the lower end portion of the operating rod 7b, so that the operating rod 7b is The guide portion 10 can also be rotated in the horizontal direction.

  The holding part 8 faces the pipe axis direction of the existing fluid pipe 1, is shorter than the guide part 10, and has a vertical width dimension substantially the same as the diameter of the existing fluid pipe 1. The upper and lower ends of the holding portion 8 are provided with slide protrusions 8a that can be inserted into the key grooves 10a formed in the guide portion 10, and the holding portion 8 inserts the slide protrusions 8a into the key grooves 10a. It arrange | positions in the both ends of the center axis direction side in the guide part 10 in the state arrange | positioned inside.

  For this reason, the holding part 8 is provided with an accommodation position accommodated in the guide part 10 shown in FIG. 6 and an antirust cover 5 shown in FIG. 9 by moving the slide protrusion 8a in the keyway 10a. The sliding movement is possible between the moving position where the fluid pipe 1 is held in contact with the cut surface 1a. Further, at the upper end and the lower end of the outer end portion of the holding portion 8 on the central axis direction side, a sandwiched portion 8b that is sandwiched by a sandwiching portion 5d described later is provided on the outer side of the guide portion 10 in the central axis direction. Projected toward each.

  As shown in FIGS. 6 and 8B, a beam portion 8 c that connects the left and right end portions of the holding portion 8 is formed at a substantially central portion in the vertical direction of the holding portion 8. Further, both the holding portions 8 and 8 are connected to each other at both left and right ends by a coil spring 14 as a biasing portion in the present invention, and the both holding portions 8 and 8 slide from the housing position toward the moving position. By being moved, these coil springs 14 urge both the holding portions 8 and 8 toward the accommodation position.

  As shown in FIG. 8B, the rotating body 12 is provided on the operation rod 7 b at the approximate center in the guide portion 10. The rotating body 12 is formed in a substantially rectangular shape with corners formed in an arc shape, is point-symmetric with respect to the operation rod 7b in plan view, and the holding portion 8 is disposed at the storage position. Then, it arrange | positions toward the left-right width direction of the housing | casing 2 in the longitudinal direction side.

  As shown in FIGS. 7 (a), 7 (b) and 7 (c), the rust preventive cover 5 is used to rust the cut surface 1a over the entire circumference by contacting the cut surface 1a. The rust preventive rubber 5a is formed in an annular shape when viewed from the front, and the existing fluid pipe 1 is formed on the surface facing the reduced diameter direction of the rust preventive cover 5 when the rust preventive rubber 5a is pressed toward the cut surface 1a of the existing fluid pipe 1. The guide ring 5b as a locked portion in the present invention disposed opposite to the outer peripheral surface 1b of the guide ring 5b, and the entire circumference of the guide ring 5b from the rear side end portion of the guide ring 5b toward the reduced diameter direction of the guide ring 5b. And a pressing plate portion 5c that presses the rust preventive rubber 5a toward the cut surface 1a, and a clamping portion 5d provided at the upper and lower ends of the back surface of the pressing plate portion 5c.

  The sandwiching portion 5d is configured by opposing plate bodies 5e, 5e made of stainless spring steel or the like having elasticity and anticorrosion properties to the left and right. Moreover, the antirust rubber 5a formed cyclically | annularly is arrange | positioned at the front side of the press plate part 5c. The rust preventive rubber 5a is fixed to the front surface of the pressing plate portion 5c and the inner peripheral surface of the guide ring 5b by an adhesive or the like, and the front side of the rust preventive rubber 5a extends over the entire cut surface 1a. It is formed in the curved surface which contact | abuts. The radial width of the rust preventive rubber 5a is longer than the thickness of the cut surface of the existing fluid pipe 1 and the radial width of the pressing plate portion 5c.

  Further, the guide ring 5b has four through holes 5f (two not shown) facing the radial direction of the guide ring 5b. When the rust preventive rubber 5a is pressed against the cut surface 1a, the existing fluid It is formed so as to be disposed between the tube 1 and each extending piece 11d.

  As shown in FIG. 6, the rust-proof cover 5 configured in this way is pressed against the holding parts 8 arranged at the accommodation positions of the guide parts 10 from the back side, thereby covering the rust-proof cover 5. The clamping part is pressed by the clamping part 5d, and the clamped part is clamped by the elastically deformed clamping part 5d. For this reason, the holding part 8 holds the rust preventive cover 5 using the force by which the holding part 5d holds the held part 8b as a locking force.

  Next, the rust prevention operation | movement of the cut surface 1a by the rust prevention cover 5 hold | maintained at the holding | maintenance part 8 in this way is demonstrated. In this embodiment, rust prevention is simultaneously performed on both of the opposing cut surfaces 1a and 1a of the existing fluid pipe 1, but only the rust prevention for one cut surface 1a will be described for the same operation.

  First, as shown in FIGS. 4 and 5, the user opens the valve body 3a and pushes the cylinder body 7a downward together with the operation rod 7b to prevent the rust prevention cover 5 from being held. The rust operating body 6 is disposed in the housing 2. At this time, since the rust preventive cover 5 is held by the holding portion 8 by the force for holding the holding portion 5d to the to-be-held portion 8b, the antirust cover 5 is dropped from the holding portion 8 by the resistance of the fluid flowing in the existing fluid pipe 1. It is prevented.

  Further, as shown in FIGS. 5 and 6, the rust preventive operating body 6 is configured so that the leg portion 10b is inserted into the bottom surface of the cover 2c through the rubber piece 10g while the guide protrusion 2a is inserted between the guide pieces 10f and 10f. So that the anticorrosion cover 5 and the cut surface 1a face each other (see FIG. 6) without being affected by the resistance of the fluid or the like flowing in the existing fluid pipe 1. It has become.

  In addition, since the leg portion 10b contacts the bottom surface in the cover 2c via the rubber piece 10g, the bottom surface in the cover 2c is prevented from being damaged by the leg portion 10b directly contacting the bottom surface in the cover 2c. ing. Furthermore, after the rust preventive operating body 6 is arranged at the arrangement position, the guide protrusion 2a is arranged between the two guide pieces 10f and 10f, and the leg portion 10b is covered with the rubber piece 10g to cover the cover 2c. By being in contact with the bottom surface of the inside, it is possible to continue to secure the arrangement position in the housing 2 without being affected by the resistance of the fluid or the like flowing in the existing fluid pipe 1 continuously. Yes.

  From this state, as shown in FIG. 9, FIG. 11 (a) and FIG. 11 (b), the user rotates the rotating body 12 around the operating rod 7b by rotating the operating rod 7b in the horizontal direction. The holding unit 8 is moved from the accommodation position to the moving position by moving and pressing the beam portion 8c with the rotating body 12. In the process of movement of the holding portion 8 from the storage position to the moving position, each coil spring 14 connected across the holding portions 8 has a biasing force that biases the holding portion 8 from the moving position toward the storage position. Arise.

  And by moving the holding | maintenance part 8 to a movement position, the rust prevention rubber 5a is pressed toward the cutting surface 1a via the press plate part 5c, and the front surface of the rust prevention rubber 5a and the cutting surface 1a are made to contact. Thus, the rust preventive rubber 5a is elastically deformed, and the rust preventive rubber 5a is brought into contact with the cut surface 1a without a gap.

  At the same time, the guide ring 5b comes into contact with the bent portion 11e of the extended piece 11d from the front end portion, and in the process of bringing the rust preventive rubber 5a closer to the cut surface 1a, the extended piece 11d is removed from the existing fluid. The pipe 1 is elastically deformed toward the diameter increasing direction. For this reason, the urging force acts on each of the bent portions 11 e toward the outer peripheral surface 1 b of the existing fluid pipe 1.

  At this time, the extended piece 11d is elastically deformed in the direction of expansion of the existing fluid pipe 1, so that the bent portion is elastically deformed between the branch pipe 2b and the outer peripheral surface 1b of the existing fluid pipe 1. A bent portion 11c (not shown) that is elastically deformed between the portion 11c or the cover 2c and the outer peripheral surface 1b of the existing fluid pipe 1 is elastically deformed toward the outer peripheral surface 1b of the existing fluid pipe 1. Pressed. For this reason, an urging force acts on each bent portion 11c toward the branch pipe 2b or the cover 2c.

  And if each through-hole 5f is arrange | positioned between the existing fluid pipe | tube 1 and each bending part 11e by making the rust prevention rubber 5a contact | abut with respect to the cut surface 1a without a gap, the existing fluid pipe | tube 1 which will work on each bending part 11e The urging force directed toward the outer peripheral surface 1b and the urging force directed toward the branch pipe 2b or the cover 2c acting on each bent portion 11c act as a locking force, and on the side facing the outer peripheral surface 1b of the existing fluid pipe 1 in each bent portion 11e. The end portion is inserted into each through hole 5f, and the rust preventive cover 5 is held in contact with the cut surface 1a of the existing fluid pipe 1.

  After the rust preventive cover 5 is held in contact with the cut surface 1a, the user rotates the operating rod 7b in the direction opposite to that when the rust preventive cover 5 is moved toward the cut surface 1a. By directing the longitudinal direction side of the moving body 12 in the left-right width direction of the housing 2, as shown in FIG. 6, the holding portion 8 is moved from the moving position to the receiving position by the biasing force of each coil spring 14.

  After moving the holding part 8 to the accommodation position, the rust preventive operating body 6 is arranged in the work case 4 by pulling the cylinder 7a upward together with the operation rod 7b, and the valve body 3a is operated. The inside of the branch pipe 2b and the work case 4 are closed. Then, a work case (not shown) that houses the flow control valve 15 is attached to the upper end of the partition portion 3 in place of the work case 4 that houses the rust prevention operation body 6.

  Next, as shown in FIG. 12, by operating the valve body 3a, the inside of the branch pipe 2b and the inside of the work case are communicated, and the control valve 15 is directed from the inside of the work case into the housing 2. The lower end of the restriction valve 15 is brought into contact with the bottom surface in the cover 2c. The flow control valve 15 has an outer diameter smaller than the inner diameter of the branch pipe 2b. The flow control valve 15 has an outer periphery on the upper portion of the flow control valve 15 with its lower end contacting the bottom surface in the cover 2c. Are inserted in a watertight manner along the inner peripheral surface of the branch pipe 2b. Thereafter, the user can open and close the flow path in the existing fluid pipe 1 by moving the valve body 15a provided in the flow control valve 15 up and down.

  As described above, in the rust preventive apparatus according to the present embodiment, the casing 2 is a locking metal fitting that is disposed along the outer peripheral surface 1b of the existing fluid pipe 1 when the casing 2 seals the existing fluid pipe 1. 11, and the rust prevention cover 5 includes a guide ring 5 b that rusts the cut surface 1 a and is held in contact with the cut surface 1 a by being held by the locking metal fitting 11. The sealing metal fitting 11 can be easily disposed along the outer peripheral surface 1b of the existing fluid pipe 1 only by sealing, and the anticorrosion cover 5 is strong against the housing 2 via the locking metal fitting 11. Therefore, even if a force is applied to the rust-proof cover 5 in the direction away from the cut surface 1a, the rust-proof cover 5 is prevented from being detached from the cut surface 1a and the rust-proof cover 5 is prevented from coming off from the cut surface 1a. Contact holding can be maintained stably.

  Moreover, the rust prevention operation body 6 arrange | positions the holding | maintenance part 8 which hold | maintained the rust prevention cover 5 so that attachment or detachment was possible, the rotation body 12 which moves the holding | maintenance part 8 between an arrangement position and the cut surface 1a, and the holding | maintenance part 8. And the coil spring 14 urging toward the position, so that the rotating body 12 can be easily simplified by urging the coil spring 14 after moving the holding portion 8 holding the rust preventive cover 5 from the arrangement position to the cut surface 1a. It can be returned to the arrangement position.

  Further, since the guide ring 5b is locked using the elastic force of the locking metal fitting 11 as a locking force, the locking force for the rust preventive cover 5 is optimally adjusted by appropriately adjusting the elastic force of the locking metal fitting 11. Can be.

  Further, since the guide ring 5 b is locked using the outer peripheral surface 1 b of the existing fluid pipe 1 as a reaction force of the elastic deformation of the locking metal fitting 11, the outer peripheral surface 1 b of the existing fluid pipe 1 is fixed to the locking metal fitting 11. By using it as a reaction force for elastic deformation, it is possible to maintain the locking force for the rust-proof cover 5 without using any special member.

  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 above embodiment, the fixing piece 11a and the vertical surface in the housing 2 are screwed together to attach the locking metal fitting 11 in the housing 2 along the outer peripheral surface 1b of the existing fluid pipe 1, Although the bent portion 11c is disposed while being elastically deformed between the outer peripheral surface 1b of the existing fluid pipe 1 and the housing 2, the locking metal fitting 11 is prevented from rotating around the pipe axis of the existing fluid pipe 1. As shown in FIG. 13 as the first modified example, the locking metal fitting 21 of this modified example is not formed with the extension piece 11b and the bent portion 11c of the locking metal fitting 11 shown in the above embodiment. The configuration is the same as that of the locking metal fitting 11, and the locking metal fitting 21 is not rotatable around the tube axis of the existing fluid pipe 1 only by screwing the fixed piece 11a and the vertical surface of the branch pipe 2b or the cover 2c. You may attach in the body 2.

  Moreover, in the said Example, while attaching the fixing bracket 11 in the housing | casing 2 along the outer peripheral surface 1b of the existing fluid pipe | tube 1 by screwing the fixing piece 11a and the vertical surface in the housing | casing 2, Although the bent portion 11c is disposed while being elastically deformed between the outer peripheral surface 1b of the existing fluid pipe 1 and the housing 2, the locking metal fitting 11 is prevented from rotating around the pipe axis of the existing fluid pipe 1. As shown in FIG. 14 as a second modified example, the locking metal fitting 31 of this modified example does not form the insertion hole 11f of the locking metal fitting 11 shown in the above embodiment, and the other structure is a locking metal fitting. 11, a groove portion 2 f into which a fixing piece 11 a can be inserted and arranged is formed on a vertical surface in the housing 2, and a locking metal fitting 31 is provided in the gap between the outer peripheral surface 1 b of the existing fluid pipe 1 and the housing 2. Inserted from the bent portion 11c, the bent portion 11c is elastically deformed between the outer peripheral surface 1b of the existing fluid pipe 1 and the housing 2. So while, the fixing piece 11a to insert fitted placed in the groove portion 2f, the anchor fitting 31 may be attached to the rotation impossible in the housing 2 around the tube axis of the existing fluid pipe 1.

  Moreover, in the said Example, although the latching metal fitting 11 was fixed to the housing | casing 2 by screwing with the screw | thread 17 with respect to the vertical surface of the branch pipe 2b or the cover 2c, the latching metal fitting 11 is fixed. The means for fixing to the housing 2 is not limited to the screw 17. For example, the locking metal 11 is fixed to the housing 2 by bonding the locking metal 11 and the housing 2 using an adhesive or the like. It may be.

  Moreover, in the said Example, the left-right both ends of the holding parts 8 and 8 are connected by the coil spring 14 as an urging | biasing part in this invention, and the holding parts 8 and 8 arrange | positioned in a movement position are made into an accommodation position by the coil spring 14. The biasing portion is not limited to the coil spring 14, but may be spring steel having elasticity formed in a bellows shape, for example.

DESCRIPTION OF SYMBOLS 1 Existing fluid pipe 1a Cut surface 1b Outer peripheral surface 2 Housing | casing 4 Work case 5 Antirust cover 5b Guide ring (locked part)
6 Rust prevention operation body 8 Holding part 11 Locking bracket (Locking part)
11a Fixed piece 11b Extension piece 11c Bending part 11d Extension piece 11e Bending part 12 Rotating body (moving part)
14 Coil spring (biasing part)
21 Locking bracket (locking part)
31 Locking bracket (locking part)

Claims (4)

A housing in which an existing fluid pipe is sealed, a valve body capable of opening and closing the inside of the housing, a work case connected in a sealed manner to the housing via the valve body, and in the housing A rust-proof cover that rusts the cut surface of the existing fluid pipe that has been cut in an uninterrupted state, and holds the rust-proof cover and moves between a predetermined arrangement position in the work case and the housing. And a rust preventive device for holding the rust preventive cover in contact with the cut surface in the housing, and a rust preventive device comprising:
The casing includes a locking portion disposed along the outer surface of the existing fluid pipe by the casing sealing the existing fluid pipe, and the rust-proof cover rusts the cut surface. And a locked portion that is locked by the locking portion and held in contact with the cut surface.   The rust-proof operating body includes a holding part that detachably holds the rust-proof cover, a moving part that moves the holding part between the arrangement position and the cutting surface, and the holding part at the arrangement position. The rust preventive device according to claim 1, further comprising an urging portion that urges toward the rust.   The rust preventive device according to claim 1, wherein the locked portion is locked using an elastic force of the locking portion as a locking force.   The rust preventive device according to claim 3, wherein the locked portion is locked using an outer surface of the existing fluid pipe as a reaction force of elastic deformation of the locking portion.

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