JP5562019B2 - Rust prevention device - Google Patents

Description

  The present invention relates to a housing in which an existing fluid pipe is sealed, a valve body that can open and close the upper portion 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 placed on the surface, and while holding the rust-proof cover, move up and down between the inside of the housing and the work case. The present invention relates to a rust preventive device including a rust preventive operation body that rusts a cut surface by abutting and holding a rust preventive cover.

  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 that the rust preventive cover cannot be stably maintained in contact with the cut surface because it is pulled back from the cut surface while being held in the cover holding portion.

  The present invention has been made paying attention to such problems, and can stably maintain the abutment holding of the rust-proof cover against the cut surface while preventing the rust-proof cover from being detached from the cut surface. It aims at providing a rust prevention device.

In order to solve the above problems, the rust preventive device of the present invention is:
A case in which an existing fluid pipe is sealed; a valve body capable of opening and closing an upper portion of the case; a work case connected in a sealed manner to the case via the valve body; An annular rust-proof cover disposed on the upper surface, and the existing fluid that holds the rust-proof cover and moves up and down between the inside of the housing and the work case, and is cut in an uninterrupted state in the housing. A rust preventive device comprising a rust preventive operation body that rusts the cut surface by causing the rust preventive cover to abut against and hold the cut surface of the pipe,
The rust prevention cover includes a locked portion that is disposed at a predetermined position by contacting the cut surface, and the housing is disposed at the predetermined position from the outside of the housing. A locking portion that is operated toward the portion, and the locking portion is locked to the locked portion to support the rust preventive cover at a position where it is held in contact with the cut surface. It is characterized by.
According to this feature, since the rust-proof cover is firmly held by the housing through the locking portion, even if force is applied to the rust-proof cover in a direction away from the cut surface, the cut surface of the rust-proof cover It is possible to stably maintain the abutment against the cut surface of the rust preventive cover while preventing detachment from the rust preventive cover.

The rust preventive device of the present invention is
An insertion hole for inserting the locking portion is formed in the locked portion.
According to this feature, by operating the locking portion from the outside of the housing and inserting the locking portion into the insertion hole, the locking portion is locked to the locked portion using the inner peripheral surface of the insertion hole. Therefore, it is possible to easily maintain contact with the cut surface of the anticorrosion cover.

The rust preventive device of the present invention is
The to-be-latched portion has a gap with at least an outer peripheral surface of the existing fluid pipe until at least the rust-proof cover comes into contact with the cut surface.
According to this feature, when the rust-proof cover is brought into contact with the cut surface, the locked portion is not caught on the cut surface, so that the rust-proof cover can be easily brought into contact with the cut surface and Since the locking portion does not contact the outer peripheral surface, it is possible to prevent the outer peripheral surface from being damaged.

The rust preventive device of the present invention is
The rust preventive cover is provided with guide means for guiding the movement of the rust preventive cover to a position where it comes into contact with the cut surface.
According to this feature, generation of rust on the cut surface due to the occurrence of a portion that does not contact the rust preventive cover on the cut surface can be reliably prevented.

It is a partially broken top view which shows the existing fluid pipe | tube cut | disconnected in the Example. It is a fragmentary sectional view which shows the antirust cover of the state hold | maintained at the antirust operation body in the work case. It is sectional drawing which shows the state by which the antirust operation body is arrange | positioned in the housing | casing. It is AA sectional drawing of the housing | casing in FIG. (A) is a front view which shows a rust prevention cover, (b) is BB sectional drawing of the rust prevention cover in Fig.5 (a), (c) is a rear view which shows a rust prevention cover. It is. (A) is a side view which shows a rust prevention operation body, (b) is a vertical side view of a rust prevention operation body. (A) is sectional drawing which shows the state which has arrange | positioned the antirust cover facing the cut surface, (b) inserted the locking bolt in the insertion hole of the tongue part of the antirust cover which contact | abutted to the cut surface. It is sectional drawing which shows a state, (c) is sectional drawing which shows the state of a rust prevention cover when a holding | maintenance part is returned to an accommodation position again, after making a rust prevention cover contact and hold. (A) is sectional drawing which shows the state in which the holding | maintenance part is arrange | positioned in the accommodation position, (b) is sectional drawing which shows the state in which the guide plate is contact | abutting to the outer peripheral surface of the existing fluid pipe | tube.

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

  The antirust cover according to the 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.

  Reference numeral 1 in FIG. 1 is an existing fluid pipe to which the rust preventive device of the present invention is applied. The existing fluid pipe 1 is, for example, a water pipe in which clean water as a fluid flows inside, and in order to provide a new valve body or the like in the existing fluid pipe 1, a predetermined portion such as a hole saw or the like is cut. It has been cut by a tool.

  As shown in FIG. 1 and FIG. 2, first, the existing fluid pipe 1 includes a casing 2 for watertight sealing the existing fluid pipe 1, and both ends of the casing 2 in the tube axis direction of the existing fluid pipe 1. A push wheel (not shown) that is attached in a watertight manner is provided. A partition portion 3 having a valve body 3a that can be opened and closed by sliding in the horizontal direction is attached to the upper portion of the housing 2 in a watertight manner.

  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 surface 1a of the existing fluid pipe 1 is formed in an arc shape in plan view by being cut by the hole saw.

  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.

  The rust preventive device of the present invention is a device that rusts the cut surface 1a of the existing fluid pipe 1 cut in the casing 2 in this manner while maintaining an uninterrupted flow state.

  As shown in FIGS. 1 and 2, the housing 2 is composed of an upper housing 2 b attached from above the existing fluid pipe 1 and a lower housing 2 c attached from below the existing fluid pipe 1. . A flange 2d is formed on the left and right sides of the upper casing 2b over substantially the entire length in the front-rear width direction of the upper casing 2b, and a lower casing 2c is formed on the left and right sides of the lower casing 2c. A flange 2e is formed over substantially the entire length in the front-rear width direction. The upper casing 2b and the lower casing 2c fasten these left and right flanges 2d and 2e at the same vertical position as the pipe axis of the existing fluid pipe 1, and the above-described push ring (not shown) is connected to the pipe of the existing fluid pipe 1. The existing fluid pipe 1 is sealed in a watertight manner by being attached to both ends of the existing fluid pipe 1 of the housing 2 on the pipe axis direction side from the axial direction.

  As shown in FIGS. 3 and 4, the two flanges 2 e and 2 e of the lower housing 2 c have two locking holes 2 f facing the center in the left-right width direction of the existing fluid pipe 1, respectively. It forms toward the outer peripheral surface 1b of the vicinity of the different cut surface 1a of the existing fluid pipe | tube 1 so that it may become a pair in an axial direction.

  As shown in FIG. 7A, the diameters of these locking holes 2f are formed to have the largest diameter on the outer side of the housing 2, and the inner side of the housing 2 is the outer side of the housing 2. It has a smaller diameter than the side. An intermediate portion of the locking hole 2 f between the inner side of the housing 2 and the outer side of the housing 2 has a larger diameter than the inner side of the housing 2 and is larger than the outer side of the housing 2. It is formed in a small diameter, and a female screw portion (not shown) is formed in this intermediate portion.

  Locking bolts 2g as locking portions in the present invention are disposed in these locking holes 2f. These locking bolts 2g have a neck lower portion disposed on the inner side of the housing 2 and a head portion disposed at an intermediate portion of the locking hole 2f. A packing is provided at a predetermined position below the neck of the locking bolt 2g to keep the space between the locking hole 2f and the locking bolt 2g watertight.

  Furthermore, a male screw part is formed on the peripheral surface of the head of the locking bolt 2g. Therefore, the locking bolt 2g can be screwed into the housing 2 from the outside of the housing 2 by using a tool such as a hexagon wrench or a screwdriver. By screwing inward, the tip of the bottom of the locking bolt 2g comes into contact with the outer peripheral surface 1b of the existing fluid pipe 1 (see FIG. 7B).

  As shown in FIG. 2, 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 FIG. 3, after the valve body 3a is opened from this state, the user pushes the cylinder body 7a downward together with the operation rod 7b, whereby the rust prevention cover 5 held by the rust prevention operation body 6 is obtained. Is arranged at a position facing the cut surfaces 1a, 1a of the existing fluid pipe 1.

  As shown in FIGS. 6A and 6B, the rust-proof operating body 6 has a pair of holding parts 8 and 8 into which the rust-proof cover 5 is inserted and held, and both holding parts 8 and 8 are already provided. The jack 9 is moved toward the cut surface 1a of the fluid pipe 1, and the guide portion 10 is provided with the jack 9 inside to guide the movement of the holding portions 8, 8 to the cut surface 1a. Yes. As shown in FIG. 6 (a), the pair of holding portions 8, 8 and the jack 9 and the guide portion 10 are provided approximately symmetrically with respect to the left and right sides of the figure. The structure will be described.

  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 lower housing 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 arrange the anticorrosion 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. 4 and 6A, 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 of the guide portion 10 in the left-right width direction. 10 opposite to the central axis direction.

  On the other hand, as shown in FIGS. 3 and 4, the guide protrusion 2 a extends from the upper housing 2 b to the lower housing 2 c on the inner side surface of the housing 2 in the left-right width direction side in the central axis direction of the guide portion 10. It is provided facing. 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 placed in the existing fluid pipe 1. Can be brought into contact with the bottom surface of the lower housing 2c without being influenced by the fluid flowing through the bottom housing 2c.

  As shown in FIG. 6B, 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. A lower portion of the operation rod 7b disposed in the guide portion 10 is formed on a shaft portion 7c formed with a right screw. 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 operation rod 7b is disposed below the guide portion 10 through the through hole 10e, and the bolt 12 is screwed to the lower end portion of the operation rod 7b so that the operation 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 moves the slide protrusion 8a in the key groove 10a, and the holding position accommodated in the guide part 10 shown in FIGS. 7 (a) and 8 (a). 7 (b) and FIG. 8 (b) are slidably movable between the rust preventive cover 5 and a moving position where the rust preventive cover 5 is held in contact with the cut surface 1a of the existing fluid pipe 1.

  In addition, holding members 11 project from the outer end of the holding portion 8 on the central axis direction side toward the outer side of the guide portion 10 in the central axis direction. These holding members 11 are made of a thin plate-like elastic body such as spring steel having elasticity, and the front end portion of the holding member 11 is bent and formed in a substantially arc shape toward the center direction of the guide portion 10. It is formed in the bent portion 11a. The elastic force of the holding member 11 is determined in advance by the user bending both the bent portions 11a toward the center of the holding portion 8 on the vertical width direction side and the center on the left and right width direction side, or in a direction away from the center. Adjustment is possible by keeping it.

  The jack 9 is disposed at the approximate center in the guide portion 10. The jack 9 is pivotally supported by a screwed portion 9a screwed to the shaft portion 7c of the operation rod 7b and a pivot shaft 13a having one end provided in the screwed portion 9a and facing in the left-right width direction. A pair of arms 9b, and the other end of each arm 9b, 9b is pivotably pivoted by a pivot 13b facing the holding width 8 facing each other in the guide section 10 in the left-right width direction. It is supported.

  For this reason, the jack 9 moves up and down in the shaft portion 7c of the screwed portion 9a, which is performed when the user rotates the operation rod 7b in the horizontal direction, in the direction of the central axis of the guide portions 10 of both holding portions 8. It can be converted to movement on both sides of the side.

  As shown in FIGS. 5 (a), 5 (b) and 5 (c), the rust preventive cover 5 abuts against the cut surface 1a to prevent the cut surface 1a from being rusted over the entire circumference. The rust rubber 5a, the pressing plate portion 5e that presses the rust-proof rubber 5a toward the cut surface 1a, and the rust-proof cover 5 when the rust-proof rubber 5a is pressed toward the cut surface 1a of the existing fluid pipe 1 The guide plate 5b as the guide means in the present invention that is slidably contacted with the outer peripheral surface 1b of the existing fluid pipe 1 on the surface facing the radial direction, and the outer peripheral surface 1b of the existing fluid pipe 1 by the rust preventive rubber 5a coming into contact with the cut surface 1a. And a guide ring 5d to which the rust preventive rubber 5a, the pressing plate 5e, the guide plate 5b, and the tongue 5c are fixed. ing.

  The guide ring 5d is made of a metal material such as steel, and has an outer diameter that is formed in an annular shape that is substantially the same as the vertical width of both ends of the holding portion 8 on the central axis direction side. The holding part 8 is formed in substantially the same curved shape over the entire circumference with the end on the central axis direction side.

  As shown in FIGS. 5B, 5C, and 8A, a pair of guide plates 5b are fixed to the upper and lower ends of the outer peripheral surface of the guide ring 5d by welding or the like. These guide plates 5b are made of a thin plate-like elastic body such as spring steel having a larger elastic force than the holding member 11 and the rust preventive rubber 5a. An end portion of the guide plate 5b on the tube axis direction side is formed with an inclined portion 5f that is inclined toward the diameter increasing direction of the guide ring 5d.

  A pair of tongues 5c are fixed by welding or the like slightly below the tube shaft of the guide ring 5d at the left and right portions of the outer peripheral surface of the guide ring 5d. The tongue 5c is formed with an insertion hole 5g extending in the radial direction of the existing fluid pipe 1. Note that the guide plate 5b described above has a longer projecting width dimension toward the tube axis direction of the guide ring 5d than the tongue 5c.

  A pressing plate portion 5e is fixed to the rear end portion of the guide ring 5d by welding or the like. The pressing plate portion 5e is formed in an annular shape having the same curved shape as the guide ring 5d over the entire circumference of the rear end portion of the guide ring 5d.

  On the front side of the pressing plate portion 5e on the inner peripheral surface of the guide ring 5d, an annular rust preventive rubber 5a is disposed. The rust preventive rubber 5a is fixed to the front surface of the pressing plate portion 5e and the inner peripheral surface of the guide ring 5d with 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 width dimension in the radial direction of the rust preventive rubber 5a is longer than the thickness of the cut surface of the existing fluid pipe 1a, and shorter than the width dimension in the radial direction of the pressing plate portion 5e. It is formed in the size.

  As shown in FIGS. 7 (a) and 8 (a), the rust-proof cover 5 configured in this way is an end portion on the central axis direction side of each holding portion 8 arranged at the accommodation position of the guide portion 10. On the other hand, the holding member 11 is pressed from the back side toward the outer side of the holding portion 8 and is inserted and fitted in an elastically deformed state. For this reason, the holding part 8 uses the bending part 11a on the outer peripheral surface of the guide ring 5d by using the elastic force of the holding member 11 as a result of pressing from the antirust cover 5 in the direction of diameter reduction of the antirust cover 5 as a locking force. The rust preventive cover 5 is held by the contact.

  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 opposing cut surfaces 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. 2 and 3, 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 locked by the bent portion 11 a of the holding member 11, the rust preventive cover 5 is prevented from falling off the holding portion 8 due to the resistance of the fluid flowing in the existing fluid pipe 1.

  Further, as shown in FIGS. 3 and 4, the rust preventive operating body 6 is configured so that the leg portion 10b is inserted into the lower housing 2c through the rubber piece 10g while the guide protrusion 2a is inserted between the guide pieces 10f and 10f. The rust-proof cover 5 and the cut surface 1a face each other without being affected by the resistance of the fluid or the like flowing in the existing fluid pipe 1 (see FIGS. 7A and 8A). ) See) It is arranged at the arrangement position.

  In addition, since the leg portion 10b abuts on the bottom surface in the lower housing 2c via the rubber piece 10g, the leg portion 10b directly abuts on the bottom surface in the lower housing 2c, so that the bottom surface in the lower housing 2c. Is prevented from being damaged. 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, 10f, and the leg portion 10b is connected to the lower housing through the rubber piece 10g. By being in contact with the bottom surface in the body 2c, the arrangement position in the housing 2 can be continuously secured without being affected by the resistance of the fluid or the like flowing in the existing fluid pipe 1. It has become.

  From this state, as shown in FIGS. 7A and 7B, the user moves the holding portion 8 from the accommodation position to the movement position by rotating the operation rod 7b in the horizontal direction. By the movement of the holding portion 8 from the accommodation position to the movement position, the rust prevention cover 5 is moved toward the cut surface 1a. At this time, as shown in FIGS. 8A and 8B, the guide plate 5b comes into contact with the upper and lower end portions of the outer peripheral surface 1b of the existing fluid pipe 1 from the inclined portion 5f. The rust preventive rubber 5a contacts the cut surface 1a of the existing fluid pipe 1 so that the rust preventive cover 5 does not move up and down due to the resistance received from the fluid. To guide.

  And as shown in FIG.7 (b), by further moving the holding | maintenance part 8 to a movement position, the rust preventive rubber 5a is pressed toward the cut surface 1a via the pressing plate part 5e, and the rust preventive rubber 5a is pressed. The rust preventive rubber 5a is elastically deformed by bringing the front surface of the metal plate and the cut surface 1a into contact with each other, and the rust preventive rubber 5a is brought into contact with the cut surface 1a without a gap. At this time, the tongue portion 5c has a locking hole 2f in the left-right width direction in a state where a gap is formed between the rust preventive rubber 5a and the outer peripheral surface 1b of the existing fluid pipe 1 due to the contact of the rust preventive rubber 5a. And the outer peripheral surface 1 b of the existing fluid pipe 1.

  In this state, the user uses a tool such as a hexagon wrench or screwdriver to screw the locking bolt 2g from the outside of the housing 2 toward the tongue 5c, and the tip of the locking bolt 2g at the lower end of the neck Is brought into contact with the outer peripheral surface 1b of the existing fluid pipe 1 while being inserted into the insertion hole 5g of the tongue 5c. At this time, the user feels from the locking bolt 2g the reaction force facing the outside of the housing 2 that is caused by the tip of the lower portion of the locking bolt 2g coming into contact with the outer peripheral surface 1b of the existing fluid pipe 1. Thus, it can be determined that the rust preventive cover 5 is held in contact with the cut surface 1a of the existing fluid pipe 1. Thus, by screwing the locking bolt 2g from the left and right sides of the lower housing 2c, the rust-proof cover 5 is supported by the lower housing 2c via the locking bolt 2g, and the rust-proof cover 5 is already installed. The fluid pipe 1 is held in contact with the cut surface 1a.

  After the rust preventive cover 5 is held in contact with the cut surface 1a, the user rotates and holds the operation rod 7b in the direction opposite to that when the rust preventive cover 5 is moved toward the cut surface 1a. The part 8 is moved from the movement position to the accommodation position, and the rust prevention operation to the cut surface 1a is completed.

  At this time, the holding portion 8 moves toward the accommodation position in the antirust cover 5, so that the force from the holding member 11 toward the accommodation position and the restoring force of the antirust rubber 5 a itself work. Since the tip of the neck of the locking bolt 2g abuts against the inner peripheral surface of the insertion hole 5g by the force from the side toward the housing position and the antirust rubber 5a itself, the contact against the cut surface 1a of the antirust cover 5 is achieved. The contact holding is maintained, and the locking of the one holding member 11 with respect to the rust-proof cover 5 is released while the holding member 11 is elastically deformed as the holding portion 8 moves toward the accommodation position.

  In addition, after the rust preventive cover 5 is brought into contact with the cut surface 1a to rust the cut surface 1a, a cap body (not shown) is inserted into the outer side of the housing 2 of the locking hole 2f, It is desirable to cover the head of the locking bolt 2g.

  Further, in these series of rust prevention operations, the pressure applied to the rust prevention cover 5 by the jack 9 is such that the holding portion 8 presses the pressing plate portion 5e toward the cut surface 1a instead of the rust prevention rubber 5a which is an elastic member. Is uniformly distributed over the entire circumference of the pressing plate portion 5e, and the front surface of the rust preventive rubber 5a is transmitted evenly and without loss to the cut surface 1a, and the front surface of the rust preventive rubber 5a is transferred to the cut surface 1a. It can be made to contact reliably.

  Further, the rust preventive rubber 5a is elastically deformed and brought into contact with the cut surface 1a to further elastically deform toward the back side of the rust preventive cover 5, but the rust preventive rubber 5a is pressed against the cut surface 1a. Since the plate portion 5e is sandwiched from the front-rear direction, the contact with the cut surface 1a can be stably maintained.

  Furthermore, in this embodiment, when the rust preventive rubber 5a is brought into contact with the cut surface 1a of the existing fluid pipe 1, a gap is formed between the tongue 5c and the outer peripheral surface 1b of the existing fluid pipe 1. The tongue portion 5c is arranged between the locking hole 2f and the outer peripheral surface 1b of the existing fluid pipe 1 in the left-right width direction, but the tongue portion 5c is left and right in contact with the outer peripheral surface 1b of the existing fluid pipe 1 You may make it arrange | position between the locking hole 2f and the outer peripheral surface 1b of the existing fluid pipe | tube 1 in the width direction.

  As described above, in the rust preventive apparatus according to the present embodiment, the rust preventive cover 5 includes the tongue portion 5c disposed at a predetermined position by contacting the cut surface 1a, and the casing 2 is disposed outside the casing 2. The locking bolt 2g is operated from the side toward the tongue 5c arranged at a predetermined position. The locking bolt 2g is locked to the tongue 5c, so that the rust-proof cover 5 is brought into contact with the cut surface 1a. Since the rust preventive cover 5 is firmly held by the housing 2 via the locking bolts 2g by supporting it at the position where the rust preventive cover 5 is held in contact, a force is exerted on the rust preventive cover 5 in the direction away from the cut surface 1a. Even if it works, it is possible to stably maintain the abutting and holding of the rust preventive cover 5 against the cut surface 1a while preventing the rust preventive cover 5 from being detached from the cut surface 1a.

  Since the tongue 5c is formed with an insertion hole 5g through which the locking bolt 2g is inserted, the engaging bolt 2g is operated from the outside of the housing 2 to be inserted into the insertion hole 5g. Since the stop bolt 2g can be locked to the tongue portion 5c using the inner peripheral surface of the insertion hole 5g, the abutting and holding of the rust preventive cover 5 with respect to the cut surface 1a can be easily maintained.

  Further, since the tongue portion 5c has a gap with respect to the outer peripheral surface 1b of the existing fluid pipe 1 at least until the rust-proof cover 5 comes into contact with the cut surface 1a, the rust-proof cover 5 is placed on the cut surface 1a. Since the tongue 5c is not caught on the cut surface 1a when contacting, the rust preventive cover 5 can be easily brought into contact with the cut surface 1a, and the tongue 5c can be contacted with the outer peripheral surface 1b. Therefore, the outer peripheral surface 1b can be prevented from being damaged.

  Further, since the rust preventive cover 5 is provided with a guide plate 5b that guides the movement of the rust preventive cover 5 to a position where the rust preventive cover 5 contacts the cut face 1a, the rust preventive cover 5 and the rust preventive cover 5 are provided on the cut face 1a. It is possible to reliably prevent the occurrence of rust on the cut surface 1a due to the occurrence of non-contact portions.

  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 existing fluid pipe 1 is described as a water pipe through which clean water flows, but the fluid flowing in the existing fluid pipe 1 may be liquid other than water, such as petroleum, in addition to clean water, It may be a mixture of liquid and gas.

  Moreover, in the said Example, although the existing fluid pipe | tube 1 was cut | disconnected with cutting tools, such as a hole saw, and the front side of the rust prevention cover 5 was formed in the curved surface which can contact | abut the cutting surface 1a, A cutting tool such as a cutting tool or a chain saw may be used to cut linearly, and the front side of the rust preventive cover 5 may be formed on a flat surface with respect to the cut surface.

  Moreover, in the said Example, after the antirust rubber 5a of the antirust cover 5 and the cut surface 1a contact | abutted, the front-end | tip of the neck lower part of the locking bolt 2g is inserted in the insertion hole 5g formed in the tongue part 5c. Thus, the antirust cover 5 is held in contact with the cut surface 1a, but without forming the insertion hole 5g in the tongue 5c, the tip of the bottom of the neck of the locking bolt 2g and the outer peripheral surface of the existing fluid pipe 1 The rust preventive cover 5 may be held in contact with the cut surface 1a by sandwiching the tongue 5c with 1b.

  Further, in the embodiment, both the flanges 2e and 2e of the lower housing 2c are formed with the locking holes 2f facing the center in the left-right width direction of the existing fluid pipe 1, and the left and right portions of the outer peripheral surface of the guide ring 5d. The tongue portion 5c is fixed to the rust preventive cover 5 by welding or the like, and after the rust preventive rubber 5a of the rust preventive cover 5 is in contact with the cut surface 1a, the lock bolt 2g is screwed into each lock hole 2f. Is provided in contact with the cut surface 1a, but a plurality of tongue portions 5c are provided at equal intervals over the entire circumference of the rust preventive cover 5, and the same number of locking holes 2f as the tongue portions 5c are provided in the housing 2. Further, the locking bolt 2g is provided, and the locking bolt 2g is locked to each tongue portion 5c after the rust-proof rubber 5a of the rust-proof cover 5 and the cut surface 1a come into contact with each other. You may make it contact-hold with respect to the cut surface 1a.

  Moreover, in the said Example, the press plate part 5e is formed over the perimeter of the rear-end part of the guide ring 5d, and the antirust rubber 5a is clamped by the cut surface 1a of the existing fluid pipe | tube 1, and the press plate part 5e. Thus, the cut surface 1a and the rust preventive rubber 5a are securely brought into contact with each other. However, the guide plate 5b and the tongue 5c are pushed by extending the rear ends of the guide ring 5d toward the reduced diameter direction of the guide ring 5d. A plurality of plate portions may be formed, and the rust preventive rubber 5a may be partially sandwiched between these push plate portions and the cut surface 1a of the existing fluid pipe 1.

  In the above embodiment, the locking bolt 2g is screwed from the outside of the housing 2 toward the tongue 5c, and the tip of the neck lower portion of the locking bolt 2g is inserted into the insertion hole 5g of the tongue 5c. If the threading amount until the locking bolt 2g is inserted into the insertion hole 5g is known in advance, the locking bolt 2g is inserted at the tip of the lower neck portion. The screw may not be inserted until it contacts the outer peripheral surface 1b of the existing fluid pipe 1.

DESCRIPTION OF SYMBOLS 1 Existing fluid pipe 1a Cutting surface 1b Outer peripheral surface 2 Housing | casing 2g Locking bolt (locking part)
3a Valve body 4 Working case 5 Anti-rust cover 5b Guide plate (guide means)
5c Tongue (locked part)
5g Insertion hole 6 Rust prevention operation body

Claims (4)

A case in which an existing fluid pipe is sealed; a valve body capable of opening and closing an upper portion of the case; a work case connected in a sealed manner to the case via the valve body; An annular rust-proof cover disposed on the upper surface, and the existing fluid that holds the rust-proof cover and moves up and down between the inside of the housing and the work case, and is cut in an uninterrupted state in the housing. A rust preventive device comprising a rust preventive operation body that rusts the cut surface by causing the rust preventive cover to abut against and hold the cut surface of the pipe,
The rust prevention cover includes a locked portion that is disposed at a predetermined position by contacting the cut surface, and the housing is disposed at the predetermined position from the outside of the housing. A locking portion that is operated toward the portion, and the locking portion is locked to the locked portion to support the rust preventive cover at a position where it is held in contact with the cut surface. Rust prevention device characterized by.   The rust preventive device according to claim 1, wherein an insertion hole through which the locking portion is inserted is formed in the locked portion. The said locked part has a clearance gap between the outer peripheral surfaces of the said existing fluid pipe | tube until the said rust preventive cover contact | abuts to the said cut surface at least. rust device.   The rust prevention device according to any one of claims 1 to 3, wherein the rust prevention cover is provided with guide means for guiding the movement of the rust prevention cover to a position where the rust prevention cover comes into contact with the cut surface. .

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