JP2007024227A - Cover for piping, and connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cover for piping easily mounted and removed while reducing working man-hours. <P>SOLUTION: An inner cylinder part 13 of the cover 10 for piping is fitted to the inner periphery of the piping 30. An engaging bolt 14 mounted to an outer cylinder part 11 is projected into a recessed step part 41 formed at the outer peripheral surface on the opening side of the piping 30, and the tip part of the engaging bolt 14 is allowed to abut on a sidewall of the recessed step part 41 on the opening side of the piping 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe cover and a connection structure for connecting to an opening of a pipe constituting a pipe line and performing a water stop treatment.

  As a connection structure for connecting pipes to each other, Patent Document 1 discloses an earthquake resistance that allows a certain amount of insertion / removal operation between the pipes on the receiving side and the insertion side in the event of an earthquake while preventing final separation. A connection structure having a function is disclosed.

Specifically, a protrusion that can be engaged with a lock ring disposed on the inner periphery of the receiving-side pipe is formed on the outer periphery of the insertion-side piping. It is described that when the pipe is inserted, the protrusion at the tip engages with the lock ring and restricts both pipes from being detached while allowing movement in the axial direction. .
JP-A-7-253183

  By the way, in piping work, it may be difficult to install piping in the entire area of the final planned construction section due to the construction period and cost. Construction may be performed.

  In this case, it is necessary to close the opening of the pipe constituting the pipe line and perform a temporary water stop treatment. In the pipe connection structure described above, first, the flange member is engaged with the pipe outer periphery, There is a problem that a work such as attaching a closing lid is required, which increases the number of work steps at the time of construction on site and takes time.

  This invention is made | formed in view of this point, The place made into the objective is providing the cover and connection structure for piping which are easy to attach and detach, suppressing work man-hours.

That is, the invention of claim 1 is a piping cover that is connected to an opening of a pipe constituting a pipe and closes the opening,
An outer cylinder part formed in a cylindrical shape and having an inner diameter larger than the outer diameter of the pipe;
A lid that closes one opening of the outer cylinder;
An inner cylinder portion that extends in the axial direction from the lid portion to the inner side of the outer cylinder portion, and can be fitted to the inner periphery of the pipe;
It is provided with the engaging part which is provided in the said outer cylinder part and can protrude toward the radial inside of this outer cylinder part.

  Therefore, according to the present invention, after the inner cylinder portion of the piping cover is fitted to the inner periphery of the piping, the engaging portion is protruded toward the piping side, for example, formed on the outer peripheral surface of the piping. It can be made to engage with a recessed step part, and the cover for piping can be easily connected to piping.

The invention of claim 2 is the piping cover according to claim 1,
The lid part is formed with a pressing bolt hole penetrating through a space defined by the outer peripheral surface of the inner cylinder part and the inner peripheral surface of the outer cylinder part.

  Therefore, according to the present invention, when removing the piping cover from the piping, the pressing bolt is screwed and the tip portion is pressed against the connecting end of the piping, so that the piping cover is driven by the axial thrust of the pressing bolt. Will come off and will be easy to remove.

Invention of Claim 3 is the cover for piping described in Claim 1 or 2,
The lid portion is formed with an internal pressure adjusting hole penetrating inside the inner cylinder portion,
The internal pressure adjusting hole is provided with a closing member for closing the internal pressure adjusting hole.

  Therefore, according to the present invention, when removing the pipe cover connected to the pipe, the internal pressure of the pipe is high due to the influence of the water stored in the pipe. Air or water in the piping can be released to reduce the internal pressure, and the piping cover can be removed smoothly.

The invention of claim 4 is the piping cover according to any one of claims 1 to 3,
A taper that tapers toward the tip is formed on the entire circumference of the connection end of the inner tube portion.

  Therefore, according to the present invention, since the entire circumference of the connecting end portion of the inner cylinder portion is formed in a tapered shape that tapers toward the tip, the inner cylinder portion of the pipe cover is fitted to the inner circumference of the pipe. In doing so, for example, the frictional resistance with the sealing material inside the pipe is reduced, and the insertion can be smoothly performed.

Invention of Claim 5 is the connection structure which connected the cover for piping of Claim 1 to the opening part of piping which comprises a pipe line,
On the outer peripheral surface on the opening side of the pipe, a concave step is formed over the entire circumference,
The inner cylinder part of the pipe cover is fitted to the inner periphery of the pipe,
The engaging portion protrudes into the recessed step portion of the pipe;
The engaging portion is in contact with and engaged with a side wall of the concave step portion on the opening side of the pipe.

  Therefore, according to the present invention, since the engaging portion of the piping cover protrudes and engages in the concave step portion formed on the outer peripheral surface on the opening side of the piping, the connecting piping cover extends in the axial direction. In addition, when it is necessary to remove the piping cover for piping extension work, etc., the piping and the piping cover can be engaged simply by returning the protruding engaging part to its original position. The state is released and can be easily removed.

The invention of claim 6 is a connection structure in which a pipe cover is connected to an opening of a pipe constituting the pipe line,
The piping cover is
An outer cylinder part formed in a cylindrical shape and having an inner diameter larger than the outer diameter of the pipe;
A lid that closes one opening of the outer cylinder;
An inner cylinder part extending in the axial direction from the lid part to the inner side of the outer cylinder part and formed so as to be fitted to the inner periphery of the pipe;
Bolt holes are formed in the opening end portion of the pipe at intervals in the circumferential direction,
A through hole is formed at a position corresponding to the bolt hole of the pipe when the pipe cover is connected to the pipe in the outer cylinder portion of the pipe cover,
The inner cylinder portion is fitted to the inner periphery of the pipe,
An engagement bolt is fastened to the bolt hole of the pipe through the through hole.

  Therefore, according to the present invention, in the circumferential direction of the opening end of the pipe, a bolt hole for pressing the bending prevention ring that prevents the bending of the inner cylinder portion of the piping cover is originally formed. If this bolt hole is used to fasten the engagement bolt through a through hole opened at a corresponding position on the pipe cover, the bolt shaft of the engagement bolt engages with the through hole, and the axial direction of the pipe cover The movement to can be regulated.

  As described above, according to the present invention, the inner cylinder portion of the pipe cover is fitted to the inner periphery of the pipe, and the engaging portion protrudes into the recessed step portion formed on the outer peripheral surface on the opening side of the pipe. By combining, the movement of the piping cover in the axial direction can be restricted. Further, when the piping cover is removed, the engagement state between the piping cover and the piping is released by simply returning the protruding engaging portion to the original position, and the piping cover can be easily removed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

<Embodiment 1>
FIG. 1 is a side view showing the configuration of the piping cover 10 according to the first embodiment of the present invention, and FIG. 2 is a plan view showing the configuration of the piping cover 10. As shown in FIG. 1, the piping cover 10 includes a cylindrical portion that has an inner diameter larger than the outer diameter of the pipe to be connected, and a lid portion that closes one opening of the outer cylinder portion 11. 12, an inner cylinder portion 13 extending in the axial direction from the lid portion 12 to the inner side of the outer cylinder portion 11, and an engagement bolt 14 (engagement portion) provided on the outer cylinder portion 11.

  Six engaging bolt holes 15 through which the engaging bolts 14 are passed are formed in the opening end portion of the outer cylinder portion 11 at intervals in the circumferential direction. The engagement bolt hole 15 penetrates in the radial direction of the outer cylinder portion 11, and when the engagement bolt 14 is screwed in, the tip end portion projects from the inner peripheral surface of the outer cylinder portion 11.

  In the first embodiment, the case where six engagement bolt holes 15 are formed in the circumferential direction has been described. However, the present invention is not limited to this configuration. For example, four engagement bolt holes 15 may be formed in the circumferential direction. It doesn't matter.

  A nut 21 that presses the outer peripheral surface of the outer cylinder portion 11 is fastened to the engagement bolt 14. After the screwing position of the engagement bolt 14 is determined, the nut 21 is tightened to engage the engagement bolt 14. The protruding position of the tip of the joint bolt 14 is fixed.

  Further, the tip end portion of the engagement bolt 14 is formed in a columnar shape from which the screw thread is removed, and is difficult to be deformed when engaged with a concave step portion 41 of a pipe to be described later.

  Six tool holes 16 are formed at intervals in the circumferential direction on the back side of the outer cylinder portion 11 from the engagement bolt hole 15. The tool hole 16 is used to insert and operate a fastening tool when the set bolt 40 is screwed into a set bolt hole 39 of a pipe to be described later, and is formed corresponding to the position of the set bolt hole 39. ing. Therefore, when only four set bolt holes are formed in the pipe, for example, only four corresponding tool holes 16 need be formed.

  Further, the engagement bolt hole 15 and the tool hole 16 are arranged so that the hole centers thereof are arranged substantially on the same straight line in the axial direction of the outer cylinder portion 11. The relative positional relationship between the engagement bolt hole 15 and the tool hole 16 is merely an example, and the present invention is not limited to this form.

  The lid portion 12 closes one of the openings of the outer tube portion 11 and the inner tube portion 13 and is formed integrally with the outer tube portion 11 and the inner tube portion 13.

  The lid portion 12 is formed with an internal pressure adjusting hole 17 penetrating inside the inner cylinder portion 13 at a substantially central position. Further, a pressing bolt hole 18 is formed at a position penetrating through a space defined by the inner peripheral surface of the outer tube portion 11 and the outer peripheral surface of the inner tube portion 13.

  The internal pressure adjusting hole 17 is a hole through which air or water in the pipe is released in order to lower the internal pressure inside the pipe which has become high due to the influence of water stored in the pipe. ) Is closed.

  The closing plug 19 has a tip that is formed of a taper screw, and has an advantageous shape for ensuring hermeticity. Further, a projection matching the shape of the tool for screwing the closing plug 19 is formed at the rear end portion, and as shown in FIG. 2, it is formed of a substantially square prism. In the first embodiment, a plug standardized by JIS B2301 is used as the closing plug 19.

  In addition, the said obstruction | occlusion plug 19 is not limited to the above-mentioned thing, For example, you may use the air evacuation bolt which an air vent hole was formed and was specified by JISG5527 instead. In this case, the internal pressure adjusting hole 17 is formed by a parallel screw. This also applies to the following embodiments.

  The internal pressure adjusting hole 17 can also be used for measuring the pressure inside the pipe by attaching a pressure gauge instead of the closing plug 19. This also applies to the following embodiments.

  A pressing bolt 20 is fastened to the pressing bolt hole 18, and when removing the piping cover 10 connected to the piping, the connecting end of the piping is pressed by screwing the pressing bolt 20, and the shaft of the pressing bolt 20 is The piping cover 10 is removed by the propulsive force in the direction, and the removal becomes easy.

  The inner cylinder portion 13 is formed so as to be fitted to the inner periphery of the pipe, and a taper 22 that tapers toward the tip is formed on the entire circumference of the connecting end portion of the inner cylinder portion 13. . By adopting such a tapered shape, when inserted into the pipe, the frictional resistance with the sealing material inside the pipe, which will be described later, is reduced, so that it can be inserted smoothly.

  FIG. 3 is a diagram illustrating a structure of a pipe connecting the pipe cover according to the first embodiment. As shown in FIG. 3, the pipe 30 includes a joint portion 31 that is open at both ends, and an opening / closing control unit 45 that controls the opening and closing of the pipe line in the joint portion 31.

  The joint part 31 forms a pipe line having both ends opened, and the inner cylinder part 13 of the pipe cover 10 is fitted therein.

  A sealing material receiving groove 32 is formed on the inner peripheral surface of the joint portion 31, and the inner peripheral surface of the joint portion 31 and the outer peripheral surface of the inner cylinder portion 13 of the pipe cover 10 are formed in the sealing material receiving groove 32. A sealing material 33 (for example, a rubber ring or the like) that is pressed against is attached.

  A lock ring housing groove 34 is formed on the inner peripheral surface of the joint portion 31 behind the seal material housing groove 32. A lock ring 35 that surrounds the outer peripheral surface of the insertion port of an extension pipe (not shown) is attached to the lock ring receiving groove 34. A ring-shaped centering rubber 36 is provided between the lock ring 35 and the lock ring receiving groove 34.

  In the first embodiment, since the tip of the inner cylinder portion 13 of the piping cover 10 has a length that does not contact the lock ring 35, the lock ring 35 and the centering rubber 36 may be removed. This also applies to the following embodiments.

  Further, a bend preventing ring receiving groove 37 is formed on the inner peripheral surface of the joint portion 31 on the opening side of the sealing material receiving groove 32. A bending prevention ring 38 is attached to the bending prevention ring receiving groove 37.

  On the opening side of the joint portion 31, there are six radial set bolt holes 39 in the circumferential direction with one end communicating with the bending preventing ring receiving groove 37 and the other end communicating with the outer peripheral surface of the joint portion 31. It is distributed and formed. The number of holes in the set bolt hole 39 is merely an example, and the present invention is not limited to this form.

  The set bolt holes 39 are screwed in the radial direction from the outer peripheral surface of the joint portion 31 to come into contact with the outer peripheral surface of the bending prevention ring 38, and the bending prevention ring 38 is attached to the inner tube portion 13 of the piping cover 10. A set bolt 40 to be pressed against the outer peripheral surface of the rim is fastened.

  A concave step portion 41 is formed on the outer peripheral surface of the joint portion 31 on the back side of the set bolt hole 39 over the entire circumference.

  An opening communicating with the opening / closing control unit 45 is formed at a substantially central position in the axial direction of the joint portion 31, and a flange 42 for connecting to the opening / closing control unit 45 is provided.

  The opening / closing control unit 45 includes a main body portion 46 that houses a valve body (not shown), a flange 48 for connection to the joint portion 47, and a switching valve 49 that switches an opening / closing state of the valve body.

  The flange 48 is connected to the flange 42 of the joint portion 31 by a mounting bolt 50 while being in contact with the flange 42.

  In addition, although the thing of the structure called a soft seal valve as mentioned above was demonstrated as an example of piping which connects the cover for piping which concerns on this invention, it is not limited to this form, For example, the insertion of the coupling part 31 The structure of the mouth is the same, and the piping cover of the present invention may be connected to a deformed tube such as the triple receiving cross tube 90 shown in FIG. 10 or the double receiving T-shaped tube 95 shown in FIG. Absent.

  FIG. 4 is a diagram illustrating a connection structure when the piping cover according to the first embodiment is connected to the piping. As shown in FIG. 4, the inner cylinder portion 13 of the pipe cover 10 is fitted to the inner periphery of the joint portion 31 in the pipe 30 and is inserted until the connection end of the joint portion 31 comes into contact with the lid portion 12.

  The sealing material 33 attached to the inner peripheral surface of the joint portion 31 is deformed by the insertion of the inner cylindrical portion 13 of the pipe cover 10, and a gap between the inner peripheral surface of the joint portion 31 and the outer peripheral surface of the inner cylindrical portion 13. Is sealed.

  The bend prevention ring 38 is pressed at the outer peripheral surface by screwing a set bolt 40 so that the position inside the pipe 30 is fixed, and the inner cylinder portion 13 of the pipe cover 10 is positioned substantially at the center of the pipe 30. It is regulated.

  Further, the engagement bolt 14 provided in the outer cylinder portion 11 is fixed in a state where the tip portion protrudes into the concave step portion 41 of the joint portion 31, and the opening of the concave step portion 41 in the joint portion 31 is fixed. Engaging the side wall. Thereby, the movement of the pipe cover 10 in the axial direction is restricted, and the pipe cover 30 is prevented from coming off from the joint portion 31.

  Hereinafter, a procedure for connecting the piping cover to the piping will be described. First, the inner cylinder part 13 of the pipe cover 10 is fitted to the joint part 31 of the pipe 30 and inserted until the lid part 12 of the pipe cover 10 contacts the connection end of the joint part 31.

  Here, the tool hole 16 formed in the outer cylinder portion 11 of the piping cover 10 is a hole that serves as a tool insertion hole when the set bolt 40 that presses the bending prevention ring 38 is screwed. When the cover 10 is inserted, it is necessary to insert the tool hole 16 and the set bolt hole 39 while appropriately adjusting so that the joint hole 31 is substantially coaxial in the radial direction of the joint portion 31.

  And after inserting the piping cover 10 to the back, the engagement bolt 14 provided in the outer cylinder part 11 is screwed, and the front-end | tip part protrudes in the recessed step part 41 formed in the outer peripheral surface of the coupling part 31. . Further, by tightening the nut 21 in a state where the engagement bolt 14 is protruded, the state where the front end portion of the engagement bolt 14 is engaged with the side wall on the opening side in the joint portion 31 of the concave step portion 41 is maintained. The cover 10 cannot be removed from the pipe 30. Thereby, the connection between the piping cover 10 and the piping 30 is completed.

  Next, a procedure for removing the piping cover from the piping will be described. First, by removing or loosening the closing plug 19 of the piping cover 10, air or water inside the piping 30 is released to reduce the internal pressure. Then, the nut 21 is loosened, and the engagement bolt 14 engaged with the concave step portion 41 of the joint portion 31 of the pipe 30 is removed. The engagement bolt 14 does not need to be completely removed from the piping cover 10, and may be loosened to a position where the tip portion does not overlap the concave step portion 41.

  Subsequently, the pressing bolt 20 attached to the lid portion 12 of the piping cover 10 is screwed. As a result, the entire end portion of the pressing bolt 20 presses the connection end of the joint portion 31 so that the entire piping cover 10 moves away from the piping 30.

  Finally, the operator can remove the piping cover 10 from the piping 30 by pulling out the piping cover 10.

  As described above, according to the present invention, the inner cylinder portion 13 of the pipe cover 10 is fitted to the inner periphery of the pipe 30, and the recessed step portion formed on the outer peripheral surface of the joint portion 31 of the pipe 30 on the opening side. By projecting and engaging the distal end portion of the engagement bolt 14 within 41, the movement of the piping cover 10 in the axial direction can be restricted. Further, when the piping cover 10 is removed, the engagement state between the piping cover 10 and the piping 30 is released by simply loosening the protruding engaging bolt 14 and returning the tip portion to the original position, so that it can be easily removed. be able to.

<Embodiment 2>
FIG. 5 is a side view showing the structure of the piping cover according to Embodiment 2 of the present invention, and FIG. 6 is a plan sectional view showing the structure of the piping cover. Since the only difference from the first embodiment is that an engagement ring is used as a means for engaging with the concave step portion of the pipe, hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals. Only the differences will be described.

  As shown in FIG. 5, the pipe cover 60 includes an outer cylinder part 61 having an inner diameter larger than the outer diameter of the pipe formed and connected to the pipe, and a lid part that closes one opening of the outer cylinder part 61. 62, an inner cylinder portion 63 extending in the axial direction from the lid portion 62 to the inner side of the outer cylinder portion 61, and an engagement ring 64 (engagement portion) provided on the outer cylinder portion 61.

  The opening end portion of the outer cylinder portion 61 protrudes radially outward and has a large thickness, and an engagement ring accommodating groove 65 for accommodating the engagement ring 64 is formed on the entire circumference of the inner circumferential surface. ing. As shown in FIG. 6, the engagement ring accommodating groove 65 accommodates an engagement ring 64 that is divided into four in the radial direction, and the inner periphery of the engagement ring 64 from the inner peripheral surface of the outer cylindrical portion 61. Grooves are formed at such a depth that the surface does not protrude.

  On the opening side of the outer cylinder portion 61, there are four radial engagement holes 67 in the circumferential direction with one end communicating with the engagement ring receiving groove 65 and the other end communicating with the outer peripheral surface of the outer cylinder portion 61. It is distributed and formed in places. Each of the engagement holes 67 is formed at a substantially central position in the circumferential direction of the engagement ring 64.

  In addition, an engagement bolt 66 is connected to the outer peripheral surface of each of the engagement rings 64, and the bolt shaft is inserted into the engagement hole 67. And the inner peripheral part of the engagement ring 64 protrudes from the inner peripheral surface of the outer cylinder part 61 in response to the radial movement of the engagement bolt 66.

  Between the engagement bolt 66 and the engagement hole 67, an engagement nut 68 having a through-shaft center is mounted. The outer periphery of the engagement nut 68 can be fastened to the inner periphery of the engagement hole 67. Further, the inner periphery of the engagement nut 68 is a screw shape that can be fastened to the outer periphery of the engagement bolt 66. That is, by engaging the engagement nut 68 at a position where the engagement ring 64 connected to the engagement bolt 66 is brought into contact with the outer peripheral surface of the pipe, which will be described later (indicated by phantom lines in FIG. 6), The main body 68 is fastened to the engagement hole 67, and the engagement bolt 66 is fastened to the engagement nut 68. The position of the engagement bolt 66, that is, the protruding position of the inner peripheral portion of the engagement ring 64 is fixed. .

  Further, a projection corresponding to the shape of the tool for screwing the engagement nut 68 is formed on one shaft end of the engagement nut 68, and specifically, it is formed by a substantially square prism. Yes.

  FIG. 7 is a diagram illustrating a connection structure when the piping cover according to the second embodiment is connected to the piping. The piping used in the second embodiment is the same as the piping used in the first embodiment.

  As shown in FIG. 7, the inner cylinder portion 63 of the pipe cover 60 is fitted into the inner periphery of the joint portion 31 in the pipe 30 and is inserted until the connection end of the joint portion 31 comes into contact with the lid portion 62.

  The sealing material 33 attached to the inner peripheral surface of the joint portion 31 is deformed by the insertion of the inner cylindrical portion 63 of the piping cover 60, and a gap between the inner peripheral surface of the joint portion 31 and the outer peripheral surface of the inner cylindrical portion 63. Is sealed.

  The bending preventing ring 38 is pressed at the outer peripheral surface by screwing of the set bolt 40 to fix the position inside the joint part 31 of the pipe 30, and the inner cylinder part 63 of the pipe cover 60 is substantially at the center of the joint part 31. It is regulated to be located in.

  Further, the engagement ring 64 provided in the outer cylinder portion 61 is fixed in a state in which the inner peripheral portion protrudes into the recessed step portion 41 of the joint portion 31, and in the joint portion 31 of the recessed step portion 41. The side wall on the opening side is engaged. Thereby, the piping cover 60 is prevented from coming off from the joint portion 31 of the piping 30.

  Hereinafter, a procedure for connecting the piping cover to the piping will be described. First, the inner cylinder part 63 of the pipe cover 60 is fitted to the joint part 31 of the pipe 30 and inserted until the lid part 62 of the pipe cover 60 contacts the connection end of the joint part 31.

  Here, the tool hole 16 formed in the outer cylinder portion 61 of the pipe cover 60 is a hole that serves as a tool insertion hole when the set bolt 40 that presses the bending prevention ring 38 is screwed in. When the cover 60 is inserted, it is necessary to insert the tool hole 16 and the set bolt hole 39 while appropriately adjusting them so that they are substantially coaxial in the radial direction of the pipe 30.

  Then, after inserting the piping cover 60 to the back, the engagement bolt 66 is pushed in so as to project the engagement ring 64 accommodated in the engagement ring accommodation groove 65 from the inner peripheral surface of the outer cylinder portion 61, and the engagement is performed. The inner peripheral portion of the ring 64 is protruded into the concave step portion 41 formed on the outer peripheral surface of the joint portion 31. Further, by tightening the engagement nut 68 with the engagement ring 64 protruding, the state in which the inner peripheral portion of the engagement ring 64 is engaged with the side wall on the opening side of the joint portion 31 of the concave step portion 41 is maintained. Thus, the piping cover 60 cannot be removed from the piping 30. Thereby, the connection between the piping cover 60 and the piping 30 is completed.

  Next, a procedure for removing the piping cover from the piping will be described. First, by removing or loosening the closing plug 19 of the piping cover 60, air or water inside the piping 30 is released and the internal pressure is reduced. Then, the engagement nut 68 is loosened, and the engagement ring 64 engaged with the concave step portion 41 of the joint portion 31 of the pipe 30 is accommodated in the engagement ring accommodation groove 65.

  Subsequently, the pressing bolt 20 attached to the lid portion 62 of the piping cover 60 is screwed. As a result, the entire end portion of the pressing bolt 20 presses the connection end of the joint portion 31 so that the entire piping cover 60 moves away from the piping 30.

  Finally, the pipe cover 60 can be removed from the pipe 30 by the operator pulling out the pipe cover 60.

  As described above, according to the present invention, since the engagement ring 64 of the piping cover 60 is engaged with the concave step portion 41 of the piping 30, the piping cover is engaged with the engagement bolt as in the first embodiment. Compared to the case where the connection 60 is made, the area where the side wall of the recessed step portion 41 and the engagement ring 64 abut on the opening side of the pipe 30 is increased, and an advantageous effect is obtained for more reliable engagement. It is done.

<Embodiment 3>
FIG. 8 is a side view showing the structure of the piping cover according to the third embodiment of the present invention. As shown in FIG. 8, the pipe cover 80 includes an outer cylinder part 81 having an inner diameter larger than the outer diameter of the pipe formed and connected to the pipe, and a lid part that closes one opening of the outer cylinder part 81. 82 and an inner cylinder 83 extending in the axial direction from the lid 82 to the inside of the outer cylinder 81.

  In the opening end portion of the outer cylinder portion 81, six through holes 84 are spaced in the circumferential direction so as to correspond to the position of the set bolt hole 39 formed on the opening side of the joint portion 31 in the pipe 30 described later. Open and formed. The through hole 84 penetrates in the radial direction of the outer cylinder portion 81, and the bolt bolt shaft of the engagement bolt 85 is inserted by inserting the engagement bolt 85 and fastening the tip end portion thereof to the set bolt hole 39 of the pipe 30. Are engaged to restrict the movement of the pipe cover 80 in the axial direction so that it does not come out of the pipe 30.

  The lid portion 82 closes one of the opening portions of the outer cylinder portion 81 and the inner cylinder portion 83 and is formed integrally with the outer cylinder portion 81 and the inner cylinder portion 83.

  The lid portion 82 is formed with an internal pressure adjusting hole 17 penetrating inside the inner cylinder portion 83 at a substantially central position. Further, a pressing bolt hole 18 is formed at a position penetrating through a space defined by the inner peripheral surface of the outer cylindrical portion 81 and the outer peripheral surface of the inner cylindrical portion 83.

  The closing plug 19 has a tip that is formed of a taper screw, and has an advantageous shape for ensuring hermeticity. Further, a projection matching the shape of the tool for screwing the closing plug 19 is formed at the rear end, and as shown in FIG. 8, it is formed of a substantially square prism.

  A pressing bolt 20 is fastened to the pressing bolt hole 18, and when removing the piping cover 80 connected to the piping, the connecting end of the piping is pressed by screwing the pressing bolt 20, and the shaft of the pressing bolt 20 is The piping cover 80 is removed by the propulsive force in the direction, and the removal becomes easy.

  The inner cylinder portion 83 is formed to be fitted to the inner periphery of the joint portion 31 in the pipe 30, and the taper 22 that tapers toward the tip at the entire periphery of the connection end portion of the inner cylinder portion 83. Is formed. By adopting such a tapered shape, the frictional resistance with the sealing material inside the pipe 30 is reduced when it is inserted into the pipe, so that it can be smoothly inserted.

  Further, the inner cylinder portion 83 protrudes in the axial direction from the outer cylinder portion 81 and is formed to have a length that reaches at least the sealing material 33 in the joint portion 31.

  FIG. 9 is a view showing a connection structure when the piping cover according to the third embodiment is connected to the piping. The piping used in the third embodiment is the same as the piping used in the first embodiment.

  As shown in FIG. 9, the inner cylinder portion 83 of the pipe cover 80 is fitted to the inner periphery of the joint portion 31 in the pipe 30, and is inserted until the connection end of the joint portion 31 comes into contact with the lid portion 82.

  The sealing material 33 attached to the inner peripheral surface of the joint portion 31 is deformed by the insertion of the inner cylindrical portion 83 of the piping cover 80, and a gap between the inner peripheral surface of the joint portion 31 and the outer peripheral surface of the inner cylindrical portion 83. Is sealed.

  The engagement bolt 85 is inserted into the through hole 84 of the piping cover 80, and the tip thereof is fastened to the set bolt hole 39 of the joint portion 31. Further, the nut 86 is tightened and the engagement bolt 85 is completely fixed. As a result, the bolt shaft of the engagement bolt 85 is engaged with the through hole 84, and the piping cover 80 is prevented from being removed from the joint portion 31 of the piping 30.

  Further, the front end portion of the engagement bolt 85 presses the outer peripheral surface of the bend prevention ring 38, and the bend prevention ring 38 is pressed by the screwing of the engagement bolt 85 and the joint portion 31 of the pipe 30. The position inside is fixed, and the inner cylinder portion 83 of the pipe cover 80 is regulated so as to be positioned at the approximate center of the joint portion 31.

  Hereinafter, a procedure for connecting the piping cover to the piping will be described. First, the inner cylinder part 83 of the pipe cover 80 is fitted to the joint part 31 of the pipe 30 and inserted until the lid part 82 of the pipe cover 80 contacts the connection end of the joint part 31.

  Here, the through-hole 84 formed in the outer cylinder portion 81 of the piping cover 80 is a hole serving as a bolt insertion port when screwing the engagement bolt 85 that presses the bending prevention ring 38. When inserting 80, it is necessary to insert the through hole 84 and the set bolt hole 39 while appropriately adjusting so that the through hole 84 and the set bolt hole 39 are substantially coaxial in the radial direction of the joint portion 31.

  Then, after inserting the piping cover 80 to the back, the engagement bolt 85 is inserted from the through hole 84 and the tip thereof is screwed into the set bolt hole 39 of the piping 30, thereby pressing the bending preventing ring 38 and the nut. By tightening 86, the engagement bolt 85 is fixed, the bolt shaft of the engagement bolt 85 is engaged with the through hole 84, and the piping cover 80 cannot be removed from the piping 30. Thereby, the connection between the piping cover 80 and the piping 30 is completed.

  Next, a procedure for removing the piping cover from the piping will be described. First, by removing or loosening the closing plug 19 of the piping cover 80, air or water inside the piping 30 is released and the internal pressure is lowered. Then, the nut 86 is loosened, the engagement bolt 85 is removed, and then the pressing bolt 20 attached to the lid portion 82 of the piping cover 80 is screwed. Accordingly, the entire end portion of the pressing bolt 20 presses the connecting end of the joint portion 31, so that the entire piping cover 80 moves in a direction away from the piping 30.

  Finally, the pipe cover 80 can be removed from the pipe 30 by the operator pulling out the pipe cover 80.

  As described above, according to the present invention, piping is set using the set bolt hole 39 through which the set bolt for pressing the outer peripheral surface of the bending preventing ring 38 originally opened at the opening end of the piping 30 is passed. Since the cover 80 and the pipe 30 are engaged, the number of parts can be reduced and the work efficiency can be improved.

  As described above, the present invention has a practicality that the piping cover can be easily attached to the opening of the piping, and that the piping cover connected to the opening of the piping can be easily removed. Since it is highly effective, it is extremely useful and has high industrial applicability.

It is a side view which shows the structure of the cover for piping which concerns on Embodiment 1 of this invention. It is a top view which shows the structure of the cover for piping which concerns on this Embodiment 1. FIG. It is a figure which shows the structure of piping which connects the cover for piping which concerns on this Embodiment 1. FIG. It is a figure which shows the connection structure which connected the cover for piping which concerns on this Embodiment 1 to piping. It is a side view which shows the structure of the cover for piping which concerns on this Embodiment 2. FIG. It is a plane sectional view showing the structure of the cover for piping concerning this embodiment 2. It is a figure which shows the structure of piping which connects the cover for piping which concerns on this Embodiment 2. FIG. It is a side view which shows the structure of the cover for piping which concerns on this Embodiment 3. It is a figure which shows the connection structure which connected the cover for piping which concerns on this Embodiment 3 to piping. It is a figure which shows the structure of the three receiving cross pipe which connects the cover for piping. It is a figure which shows the structure of the double receiving T-shaped pipe which connects the cover for piping.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe cover 11 Outer cylinder part 12 Cover part 13 Inner cylinder part 14 Engagement bolt 15 Engagement bolt hole 16 Tool hole 17 Internal pressure adjustment hole 18 Press bolt hole 19 Closure plug 20 Press bolt 21 Nut 22 Taper 30 Pipe 31 Joint Part 39 set bolt hole 40 set bolt 41 recessed step part 80 pipe cover 81 outer cylinder part 82 lid part 83 inner cylinder part 84 through hole 85 engagement bolt

Claims (6)

A piping cover that connects to an opening of a pipe constituting a pipe and closes the opening,
An outer cylinder part formed in a cylindrical shape and having an inner diameter larger than the outer diameter of the pipe;
A lid that closes one opening of the outer cylinder;
An inner cylinder portion that extends in the axial direction from the lid portion to the inner side of the outer cylinder portion, and can be fitted to the inner periphery of the pipe;
A piping cover, comprising: an engaging portion provided on the outer cylinder portion and protruding inward in a radial direction of the outer cylinder portion. In the piping cover according to claim 1,
A cover for piping, wherein a pressing bolt hole penetrating through a space defined by the outer peripheral surface of the inner tube portion and the inner peripheral surface of the outer tube portion is formed in the lid portion. In the piping cover according to claim 1 or 2,
The lid portion is formed with an internal pressure adjusting hole penetrating inside the inner cylinder portion,
The piping cover according to claim 1, wherein a blocking member for closing the internal pressure adjusting hole is attached to the internal pressure adjusting hole. In the piping cover according to any one of claims 1 to 3,
A pipe cover characterized in that a taper that tapers toward the tip is formed on the entire circumference of the connecting end of the inner cylinder. A connection structure in which the pipe cover according to claim 1 is connected to an opening of a pipe constituting the pipe,
On the outer peripheral surface on the opening side of the pipe, a concave step is formed over the entire circumference,
The inner cylinder part of the pipe cover is fitted to the inner periphery of the pipe,
The engaging portion protrudes into the recessed step portion of the pipe;
The connection structure, wherein the engaging portion is in contact with and engaged with a side wall of the concave step portion on the opening side of the pipe. A connection structure in which a pipe cover is connected to an opening of a pipe constituting a pipe line,
The piping cover is
An outer cylinder part formed in a cylindrical shape and having an inner diameter larger than the outer diameter of the pipe;
A lid that closes one opening of the outer cylinder;
An inner cylinder part extending in the axial direction from the lid part to the inner side of the outer cylinder part and formed so as to be fitted to the inner periphery of the pipe;
Bolt holes are formed in the opening end portion of the pipe at intervals in the circumferential direction,
A through hole is formed in a position corresponding to a bolt hole of the pipe when the pipe is connected to the outer cylinder portion of the pipe cover,
The inner cylinder portion is fitted to the inner periphery of the pipe,
An engagement bolt is fastened to a bolt hole of the pipe through the through hole.

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