JP2011080546A - Spacer and pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spacer which can prevent a diameter enlarging keeping section from displacing with respect to a lock ring when the diameter enlarging keeping section is inserted between both ends of splitting section of the lock ring. <P>SOLUTION: A spacer 30 has a diameter enlarging keeping section 31 sandwiched between both ends of the splitting section of the lock ring and a handling section 32 continuously arranged from the diameter enlarging keeping section 31 to the outside of socket opening section, wherein inserting grooves 34 are formed in both sides of the diameter enlarging keeping section 31, the inserting groove 34 has a pair of guiding surfaces 35b mutually faced in a depth T direction of the diameter enlarging keeping section 31, and both ends of the splitting section of the lock ring are free to be inserted/extracted between the pair of guiding surfaces 35b of the inserting groove 34 in the axis direction B of the pipe. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a spacer used for joining pipes and a pipe to which the spacer is attached.

  Conventionally, the spacer 60 shown in FIGS. 13 to 16 is an annular lock ring that is housed in a lock ring housing groove 63 formed on the inner periphery of the receiving port 62 in one pipe 61 and has a split portion 68 in the circumferential direction. 64 by expanding the diameter, passing the insertion projection 67 formed on the outer periphery of the insertion port 66 in the other pipe 65 inside the lock ring 64, and inserting the insertion port 66 into the receiving port 62, This is for maintaining the diameter-enlarged state of the lock ring 64 when joining one pipe 61 and the other pipe 65 (see Patent Document 1 below).

  The spacer 60 is sandwiched between both end portions 64a in the circumferential direction A of the split portion 68 of the lock ring 64 that is expanded in a state of being accommodated in the lock ring accommodating groove 63, and can be inserted and removed from the receiving opening 72 side. And a handle 70 connected to the outside of the receiving port opening 72 from the expanded diameter maintaining unit 69. After the insertion port 66 is inserted into the receiving port 62, the receiving portion 70 is received. It is configured such that it can be recovered to the outside of the receiving opening 72 through the gap between the opening 62 and the insertion slot 66.

  Further, a projecting portion 71 protruding inward in the pipe diameter direction is formed on the side of the receiving opening 72 of the lock ring housing groove 63 so as to face the lock ring housing groove 63 over the entire circumference. At one location of the protrusion 71, a defective portion 73 that communicates with the lock ring housing groove 63 and the opening 72 is formed. The diameter expansion maintaining portion 69 of the spacer 60 can pass through the missing portion 73 in the tube axis direction B.

  According to this, the lock ring 64 is housed in the lock ring housing groove 63 in a state where the position of the split portion 68 of the lock ring 64 is matched with the position of the missing portion 73 of the protrusion 71. Then, using a lock ring diameter increasing tool (not shown), the lock ring 64 is expanded so that the inner diameter of the lock ring 64 is larger than the outer diameter of the insertion projection 67.

  In this state, the diameter expansion maintaining part 69 of the spacer 60 is inserted between the both end parts 64a of the split part 68 of the lock ring 64 from the receiving opening 72, and the lock ring diameter increasing tool is removed. As a result, as shown in FIG. 15, the diameter expansion maintaining portion 69 is sandwiched between both end portions 64a of the lock ring 64, and the lock ring 64 is maintained in the diameter expanded state.

  As described above, the lock ring 64 is accommodated in the lock ring accommodating groove 63, and the pipes 61 and 65 are shipped in a state where the pipes 61 and 65 are separated while the spacer 60 is set in the split portion 68 of the lock ring 64. Thereafter, at the time of joining at the construction site, as shown in FIG. 13, the insertion projection 67 of the insertion port 66 of the other tube 65 is passed inside the lock ring 64 in the receiving port 62 of the one tube 61. Then, the insertion port 66 is inserted into the receiving port 62, and then the handle portion 70 is pulled to take out the spacer 60 from the gap between the receiving port 62 and the insertion port 66. As a result, the lock ring 64 is reduced in diameter and is held by the outer peripheral surface of the insertion slot 66, and the one pipe 61 and the other pipe 65 are joined. When an earthquake occurs, the insertion slot 67 is engaged with the lock ring 64 from the back side of the receptacle 62, so that the insertion slot 66 can be prevented from coming out of the receptacle 62.

JP 2006-57728 A

  However, in the above conventional format, as shown in FIG. 15, when the diameter expansion maintaining portion 69 of the spacer 60 is inserted between both end portions 64 a of the split portion 68 of the lock ring 64, There is a problem that the diameter expansion maintaining portion 69 of the spacer 60 is easily displaced in the radial direction C with respect to the lock ring 64 or a problem that the spacer 60 is easily displaced in the insertion direction D (see FIG. 14).

  The present invention provides a spacer capable of preventing the spacer's diameter expansion maintaining portion from being displaced relative to the lock ring when the spacer's diameter expansion maintaining portion is inserted between both ends of the split portion of the lock ring. The purpose is to provide a tube.

In order to achieve the above object, the first aspect of the present invention is to enlarge the diameter of an annular lock ring that is accommodated in a lock ring accommodation groove formed on the inner circumference of a receiving port in one pipe and that has a circumferentially divided portion. When joining one tube and the other tube by passing the insertion projection formed on the outer periphery of the insertion port in the other tube inside the lock ring and inserting the insertion port into the receiving port A spacer for maintaining the expanded diameter of the lock ring,
An enlarged diameter maintaining portion that is sandwiched between both ends in the circumferential direction of the divided portion of the lock ring that is expanded in a state of being accommodated in the lock ring accommodating groove, and that can be inserted / removed from the receiving opening side, and maintained the expanded diameter A handle portion continuously provided from the portion to the outside of the receiving opening,
After the insertion port is inserted into the receiving port, it is configured to be able to be collected outside the receiving port opening through the gap between the receiving port and the insertion port.
Insertion parts are formed on both sides of the expanded diameter maintaining part,
The insertion portion has a pair of guide surfaces facing each other in the thickness direction of the diameter expansion maintaining portion,
Both end portions in the circumferential direction of the split portion of the lock ring are detachable between a pair of guide surfaces of the insertion portion in the tube axis direction.

  According to this, the lock ring is accommodated in the lock ring accommodation groove, and the lock ring is maintained in an enlarged state by inserting and sandwiching the spacer diameter expansion maintaining portion between both ends in the circumferential direction of the split portion of the lock ring. Be drunk. At this time, both end portions of the split portion of the lock ring are respectively inserted between the pair of guide surfaces of the insertion portion in the tube axis direction, so that the diameter expansion maintaining portion of the spacer is in the radial direction with respect to the lock ring. It is possible to prevent the position from being displaced.

  In the spacer according to the second aspect of the invention, the insertion portion has a restriction surface that abuts the end of the lock ring on the receiving opening side from the insertion direction and restricts movement of the spacer in the insertion direction. is there.

  According to this, when inserting and sandwiching the spacer diameter expansion maintaining portion between both ends in the circumferential direction of the split portion of the lock ring, the restriction surface of the insertion portion is inserted into the end portion on the receiving opening side of the lock ring. Since the contact is made from the direction, the movement of the spacer in the insertion direction is restricted. Thereby, it can prevent that the diameter-enlargement maintenance part of a spacer shifts in a insertion direction with respect to a lock ring.

In the spacer according to the third aspect of the present invention, the insertion portion is an insertion groove in which an end portion on the insertion direction side of the diameter expansion maintaining portion and both sides of the diameter expansion maintaining portion are opened.
According to this, when inserting and sandwiching the enlarged diameter maintaining portion of the spacer between both ends in the circumferential direction of the divided portion of the lock ring, both ends of the divided portion of the lock ring are respectively inserted into the insertion groove in the tube axis direction. Inserted into.

This 4th invention is the pipe | tube which attached the spacer of any one of the said 1st invention to the 3rd invention,
The lock ring is received in the lock ring receiving groove,
Between the both ends in the circumferential direction in the split part of the lock ring, the diameter expansion maintaining part of the spacer is sandwiched,
The handle portion of the spacer is exposed from the inside of the receiving port to the outside of the receiving port opening.

  According to this, the pipe is shipped in a state where the lock ring is housed in the lock ring housing groove in the receiving port and the diameter is expanded by the spacer, and by inserting an insertion port of another pipe into the receiving port of the pipe at the construction site, The insertion protrusion of the insertion port passes through the inside of the lock ring in the receiving port.

  Thereafter, the spacer handle is pulled to remove the spacer from the gap between the receiving port and the insertion port. As a result, the diameter of the lock ring is reduced, and is held by the outer peripheral surface of the insertion port, so that the tubes are joined to each other.

In the tube according to the fifth aspect of the invention, a protrusion projecting inward in the pipe radial direction is formed on the receiving opening side of the lock ring housing groove so as to face the lock ring housing groove,
The protrusion is formed with a deficient portion that communicates with the lock ring receiving groove and the receiving opening,
The spacer has a displacement preventing member that can pass through the defect portion in the axial direction of the tube and prevents the defect portion from shifting in the circumferential direction,
The slip prevention member engages with the defect portion in the circumferential direction and can be detached from the defect portion in the tube axis direction.

  According to this, when the lock ring is housed in the lock ring housing groove in the receiving port, the diameter expansion maintaining portion of the spacer is inserted into the split portion of the lock ring and sandwiched, and the lock ring is kept in the diameter expanded state by the spacer. Since the displacement preventing member engages with the missing portion of the protrusion in the circumferential direction, the position of the spacer can be prevented from shifting (rotating) in the circumferential direction with respect to the missing portion.

  In this state, the insertion slot is inserted into the receptacle, and then the handle portion of the spacer is pulled to remove the spacer from the gap between the receptacle and the insertion slot. At this time, the slip prevention member is detached from the defect portion, and the spacer is pulled out through the defect portion.

  As described above, according to the present invention, when the diameter expansion maintaining portion of the spacer is inserted into the divided portion of the lock ring to keep the lock ring in the diameter expanded state, the diameter expansion maintaining portion of the spacer is in the radial direction with respect to the lock ring. Further, it is possible to prevent displacement in the insertion direction. Thereby, the diameter expansion maintenance part of a spacer can be set to the regular position of the division part of a lock ring, without shifting.

  Further, when the lock ring is kept in the diameter-expanded state with the spacer, the displacement preventing member engages with the missing portion of the protrusion in the circumferential direction, so that the position of the spacer is shifted (rotated) in the circumferential direction with respect to the missing portion. Can be prevented. Thereby, the spacer can be reliably taken out from the gap between the receiving port and the insertion port.

It is sectional drawing which shows the structure of the joint part of the pipes joined using the spacer in embodiment of this invention. FIG. 5 is an enlarged front view of the split part of the lock ring set in the joint port and the missing part formed in the socket. It is sectional drawing when an insertion slot is inserted in the state which set the spacer in the receptacle similarly. It is a XX arrow line view in FIG. (A) is a YY arrow figure in FIG. 3, The state which inserted the spacer in the division part of the lock ring, (b) shows the state which pulled out the spacer from the division part of the lock ring. It is a perspective view of a spacer same as the above. It is a top view of a spacer similarly. FIG. 6 is a front view of the spacer, showing a state where the spacer is set in a split portion of the lock ring. (A) is an enlarged front view of the insertion groove of a spacer, (b) is an enlarged front view of the state in which the split part end part of the lock ring was inserted in the insertion groove of the spacer. It is a side view of a spacer same as the above. It is an enlarged side view of the insertion groove of the spacer, (a) is a state in which the end of the split part of the lock ring is detached from the insertion groove, (b) is an end of the split part of the lock ring into the insertion groove. Indicates the inserted state. It is the figure which expands the diameter of a lock ring using the lock ring diameter-expansion tool similarly. It is sectional drawing when an insertion port is inserted in the state which set the conventional spacer in the receiving port. It is a side view of a spacer same as the above. It is a front view of a spacer same as the above. FIG. 4 is an enlarged front view of one end portion of the spacer and a split portion end portion of the lock ring.

Embodiments of the present invention will be described below with reference to the drawings.
For example, there is a joint structure as shown in FIG. 1 as a joint structure of a pipe having a seismic function, and a receiving port 2 is formed at an end of one pipe 1. , The seal material accommodating portion 21, the lock ring accommodating groove 4 located on the deeper side of the receiving port than the seal material accommodating portion 21, and the protrusion 22 located between the seal material accommodating portion 21 and the lock ring accommodating groove 4 A rear end surface 3 is formed which is located on the deeper side of the receiving opening than the lock ring housing groove 4.

  The sealing material accommodating portion 21 has a tapered surface 21a whose diameter is reduced toward the back side from the opening 23 and a cylindrical surface 21b having the same diameter from the back end portion of the tapered surface 21a to the protruding portion 22 on the back side. is doing. Further, as shown in FIG. 2, an annular lock ring 7 having one divided portion 6 in the circumferential direction is accommodated in the lock ring accommodation groove 4. A tapered surface 7a (see FIG. 1) is formed on the front side of the lock ring 7 so as to expand toward the outer peripheral side toward the front side.

  Further, the protrusion 22 protrudes radially inward and is formed over the entire circumference facing the lock ring housing groove 4. As shown in FIGS. 1, 2, 4, and 5, a defect 24 (notch) that communicates with the lock ring housing groove 4 and the receiving opening 23 is formed at one location of the protrusion 22. ing.

  Further, a flange 9 is formed on the outer periphery of the end portion of the receiving port 2 toward the radially outer side, and round holes 10 in the tube axis direction B are penetrated through the flange 9 at regular intervals in the circumferential direction A. A plurality are formed.

  An insertion port 13 is formed at the end of the other tube 12, and an insertion projection 14 is formed on the outer periphery of the distal end of the insertion port 13. The insertion protrusion 14 is displaced from the distal end surface of the insertion opening 13 by a predetermined length E in the removal direction F, and a straight pipe portion is interposed between the insertion protrusion 14 and the distal end surface of the insertion opening 13. Is provided. Further, a tapered surface 14 a is formed on the outer periphery on the distal end side of the insertion projection 14. The insertion opening 13 is inserted into the receiving opening 2 until the insertion protrusion 14 is positioned between the lock ring 7 and the back end surface 3. The inner diameter of the lock ring 7 is slightly smaller than the outer diameter of the insertion opening 13, and the cylindrical surface 21 b of the sealing material accommodating portion 21 is parallel to the outer peripheral surface of the insertion opening 13.

  An annular sealing material 16 made of rubber is disposed in the sealing material accommodating portion 21. A tapered surface 16a is formed at one end of the sealing material 16 on the receiving opening 23 side. An annular push ring 17 capable of pressing the sealing material 16 is disposed on the outer periphery of the portion of the insertion opening 13 that does not enter the receiving opening 2.

  A round hole 18 corresponding to the plurality of round holes 10 formed in the flange 9 is formed in the pusher wheel 17 in a penetrating state. A T-shaped bolt 19 is passed through the round hole 10 of the flange 9 and the round hole 18 of the press wheel 17, and a nut 20 is screwed onto the T-shaped bolt 19. The presser wheel 17 is pushed in the tube axial direction B by the tightening force of the T-shaped bolt 19 and the nut 20, and the sealing material 16 disposed on the outer periphery of the insertion port 13 is pressed to the back of the receiving port 2 for sealing. The material is accommodated in the material accommodating portion 21. Thereby, the sealing material 16 exhibits water tightness by the surface pressure received from the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 13, and a sealing function in the pipe joint is provided.

  At this time, the end of the sealing material 16 on the back side of the receiving port does not contact the protrusion 22 but is separated toward the receiving port opening 23 side. Incidentally, the pusher wheel 17 plays a role of only preventing the sealing material 16 from trying to escape due to the water pressure in the pipes 1 and 12, and the sealing material 16 only receives a reaction force from the pushing wheel 17, It is not sandwiched between the push wheel 17 and the protrusion 22 and compressed in the tube axis direction B.

  When a compressive force is applied in the tube axial direction B of the pipe joint due to an earthquake or the like, the insertion projection 14 can move from the position of the lock ring 7 to the back end surface 3 side of the receiving port 2. Further, when a tensile force is applied, it is possible to reliably prevent the insertion port protrusion 14 from engaging with the lock ring 7 from the back side of the receiving port 2 and the insertion port 13 from coming out of the receiving port 2. . In this way, a seismic function is imparted to the joint portion of the pipe.

  In addition, a predetermined gap S is formed between the front and rear end faces of the press wheel 17 between the circular recess 52 into which one end of the sealing material 16 is fitted, and the end face of the press wheel 17 and the opening end face of the receiving port 2. A plurality of gap maintaining members 53 are formed. The depression 52 is formed at the bottom and has a pressing surface 52a that presses one end of the sealing material 16, and a tapered shape that is formed around the pressing surface 52a and constrains the one end of the sealing material 16 in the diameter increasing direction H. And a restraining surface 52b. The constraining surface 52b and the tapered surface 16a of the sealing material 16 constitute centering means 54 for guiding the pusher wheel 17 in the radial direction C so that the center of the pusher wheel 17 is aligned with the tube axis.

  The gap maintaining members 53 are formed at a plurality of locations in the circumferential direction of the pusher wheel 17 and project outward from the end surface of the pusher wheel 17 in the tube axis direction B. Note that the height from the end face of the pusher wheel 17 to the tip of each gap maintaining member 53 is maintained at a constant value S.

When the one pipe 1 and the other pipe 12 are joined, a spacer 30 is used for maintaining the lock ring 7 in an expanded state. Below, the structure of the spacer 30 is demonstrated.
As shown in FIGS. 6 to 11, the spacer 30 is sandwiched between both end surfaces 7 b in the circumferential direction A in the divided portion 6 of the lock ring 7 that is expanded in a state of being accommodated in the lock ring accommodating groove 4. It has an enlarged diameter maintaining part 31 that can be inserted / removed from the receiving opening 23 side, and a handle part 32 provided continuously from the enlarged diameter maintaining part 31 to the outside on the receiving opening 23 side. It can be recovered outside the opening side of the receiving port 13 through the gap between the insertion port 13 and the insertion port 13.

  As shown in FIG. 8, the diameter expansion maintaining portion 31 is formed in an arc shape when viewed from the tube axis direction B. Insertion grooves 34 (an example of an insertion portion) are formed on both side portions in the width W direction of the diameter expansion maintaining portion 31. The insertion groove 34 is open at the distal end portion on the insertion direction D side of the diameter expansion maintaining portion 31 and both sides in the width W direction of the diameter expansion maintaining portion 31, and in the thickness T direction of the diameter expansion maintaining portion 31. A pair of guide surfaces 35a and 35b facing each other, and a regulating surface 36 that abuts the end portion 7c of the lock ring 7 on the receiving opening 23 side from the insertion direction D and regulates the movement of the spacer 30 in the insertion direction D. And a bottom surface 37.

  Both end portions 7d in the circumferential direction A of the split portion 6 of the lock ring 7 can be inserted into and removed from the insertion groove 34 in the tube axis direction B, respectively. As shown in FIG. 8, when both end portions 7d of the split portion 6 of the lock ring 7 are inserted into the both insertion grooves 34 of the spacer 30, the bottom surface of the insertion groove 34 is shown in FIG. 37 is in surface contact with the end surface 7 b in a state parallel to the end surface 7 b of the lock ring 7.

  Note that the bottom surfaces 37 of both insertion grooves 34 are parallel to each other, and as shown in FIG. 7, the inter-surface dimension G in the width W direction of both bottom surfaces 37 is locked so that the insertion projection 14 can be inserted smoothly. The diameter of the ring 7 can be increased, and the lock ring 7 is set in a range that can be restored by reducing the diameter. Further, as shown in FIG. 9, the thickness T of the diameter expansion maintaining portion 31 of the spacer 30 is the thickness of the end portion 7 d of the split portion 6 of the lock ring 7 so as to withstand the tightening force of the lock ring 7. It is set thicker than t and has sufficient strength. Note that the thickness T of the diameter expansion maintaining portion 31 may be set to be the same as the thickness t of the end portion 7 d of the lock ring 7.

  The handle portion 32 includes an annular grip portion 39 exposed to the outside from the opening 23 and a connection portion 40 that connects the grip portion 39 and the diameter expansion maintaining portion 31. As shown in FIG. 3, the outer end portion of the grip portion 39 in the radial direction C retreats inward in the radial direction C from the outer peripheral surface of the flange 9. Further, the grip portion 39 faces the opening end surface of the flange 9 substantially in parallel. Furthermore, as shown in FIG. 7, the width W <b> 1 of the connecting portion 40 is smaller than the width W of the diameter expansion maintaining portion 31.

  In addition, one end 40 a of the connecting portion 40 is connected to the diameter expansion maintaining portion 31, and the other end 40 b is connected to the grip portion 39. Note that the width of one end of the connection portion 40 increases toward the diameter expansion maintaining portion 31, and the thickness T1 of the connection portion 40 is larger than the thickness T of the diameter expansion maintaining portion 31 as shown in FIG. Thinly formed.

  As shown in FIGS. 4 and 5, the spacer 30 can pass the defect portion 24 in the tube axis direction B, and has a displacement prevention member 42 that prevents the defect portion 24 from shifting in the circumferential direction A. is doing. A pair of the locking members 42 are formed on both side portions on the outer peripheral surface of the one end portion 40a of the connecting portion 40, and the outer side in the radial direction C (the thickness T direction of the diameter expansion maintaining portion 31) from the outer peripheral surface of the one end portion 40a. Protruding to The pair of detent members 42 engage with the defect 24 in the circumferential direction A and can be detached from the defect 24 in the tube axis direction B. The spacer 30 is made of polycarbonate.

Hereinafter, the operation of the above configuration will be described.
Before shipping the pipes 1 and 12 to the piping construction site in a separated state, as shown in FIG. 2, the position of the split part 6 of the lock ring 7 is adjusted to the position of the missing part 24 in the receiving port 2 to lock it. The ring 7 is received in the lock ring receiving groove 4. Then, as shown in FIG. 12, the distal end portion of the scissor-shaped lock ring expanding tool 50 is inserted into the split portion 6 of the lock ring 7, and is formed on one handle 50 a of the lock ring expanding tool 50. The lock ring 7 is gradually expanded while the lock ring expanding tool 50 is opened by rotating, for example, a T-shaped bolt 51 screwed into the screw hole 50b. At this time, the inner diameter of the lock ring 7 is increased so as to be larger than the outer diameter of the insertion projection 14.

  In this state, as shown in FIG. 4 and FIG. 5A, the diameter expansion maintaining portion 31 of the spacer 30 is allowed to pass through the missing portion 24 of the protruding portion 22 from the receiving opening 23 to divide the lock ring 7. The portion 6 is inserted between both end surfaces 7 b and sandwiched, and the lock ring diameter increasing tool 50 is removed from the lock ring 7. As a result, as shown in FIGS. 3 and 8, the lock ring 7 is maintained in an expanded state by the spacer 30.

  At this time, as shown in FIGS. 9B and 11, both end portions 7 d of the split portion 6 of the lock ring 7 are inserted into the insertion grooves 34 of the spacer 30 in the tube axis direction B, respectively. Thus, both end portions 7d of the lock ring 7 are inserted between the pair of guide surfaces 35a and 35b of the insertion groove 34, and the regulation surface 36 of the insertion groove 34 is inserted into the end portion 7c of the lock ring 7 in the insertion direction. Abut from D. For this reason, it is possible to prevent the diameter-enlargement maintaining portion 31 of the spacer 30 from being displaced in the radial direction C with respect to the lock ring 7, and the movement of the spacer 30 in the insertion direction D is restricted. Can be prevented from being displaced in the insertion direction D with respect to the lock ring 7. Therefore, the diameter expansion maintaining portion 31 of the spacer 30 can be set at the normal position of the split portion 6 of the lock ring 7 without being displaced.

  At this time, as shown in FIG. 4 and FIG. 5A, the displacement preventing member 42 of the spacer 30 engages with the missing portion 24 of the protrusion 22 in the circumferential direction A. On the other hand, it is possible to prevent the rotation (rotation) in the circumferential direction A.

  In this way, the spacer 30 is set and the lock ring 7 is kept in an expanded state, and the tubes 1 and 12 are shipped in a separated state. When the pipes 1 and 12 are shipped and transported to the destination, the outer end portion in the radial direction C of the grip portion 39 of the spacer 30 is retracted inward in the radial direction C from the outer peripheral surface of the flange 9 of the receiving port 2. Therefore, the spacer 30 can be prevented from being damaged or dropped off.

  Thereafter, the pipes 1 and 12 are joined at the piping construction site. At this time, as shown in FIG. 3, by inserting the insertion port 13 of the other tube 12 into the receiving port 2 of one tube 1, the insertion projection 14 passes through the inside of the lock ring 7 whose diameter has been expanded. To do. Then, by grasping the grip portion 39 of the spacer 30 and pulling it toward the front side from the receiving opening 23, the spacer 30 is pulled out from the gap between the receiving opening 2 and the insertion opening 13 to the outside of the receiving opening 23 side. As shown in FIG. 5B and FIG. 5 (b), the diameter expansion maintaining portion 31 is removed from between both end faces 7b of the split portion 6 of the lock ring 7, and the diameter expansion state of the lock ring 7 is released. As shown in FIG. 1, the lock ring 7 is reduced in diameter and is held around the outer periphery of the insertion opening 13.

At this time, the slip prevention member 42 is surely separated from the defect portion 24 in the removal direction F, and the spacer 30 passes through the defect portion 24 and is pulled out from the gap between the receiving port 2 and the insertion port 13.
After collecting the spacer 30 as described above, as shown in FIG. 1, the sealing material 16 and the pusher wheel 17 are moved to a predetermined position on the outer periphery of the insertion opening 13, and the bolt 19 is inserted into the round holes 10 and 18. By tightening the nut 20, the push wheel 17 presses the sealing material 16 and accommodates it in the sealing material accommodating portion 21, the joint portion is sealed, the pipes 1 and 12 are joined together, and the pipes are joined at the piping construction site. The work is complete.

  When the sealing material 16 is pressed by the pusher wheel 17 and pushed into the sealing material accommodating portion 21 as described above, one end portion of the sealing material 16 is restrained in the diameter-enlarging direction H by the restraining surface 52b of the recessed portion 52. It is possible to prevent one end of the material 16 from moving (deforming) in the diameter-enlarging direction H along the pressing surface 52a of the recess 52. Thereby, the one end part of the sealing material 16 is not pinched between the pusher wheel 17 and the opening end surface of the receiving port 2.

  Further, when the pusher wheel 17 moves in the pushing direction I by tightening the nut 20, the restraining surface 52b of the pusher wheel 17 is brought into contact with the tapered surface 16a at one end of the sealing material 16 and guided in the radial direction C. The center of the pusher wheel 17 is aligned with the tube axis, and the pusher wheel 17 is automatically centered.

  Furthermore, the gap between the push wheel 17 and the receiving port 2 can be accurately and easily maintained at the predetermined gap S by the tip of each gap maintaining member 53 coming into contact with the opening end surface of the receiving port 2. The predetermined gap S is set to such a size that the pressing surface 52a, the restraining surface 52b, and the inner peripheral surface of the receiving port 2 compress the sealing material 16 appropriately, so that the sealing function by the sealing material 16 is insufficient. It is possible to prevent the occurrence of a problem or a problem that the sealing material 16 is pressed with an excessive pressing force.

In the above embodiment, as shown in FIG. 2, the defect portion 24 is formed at one location of the projection 22 in the receiving port 22, but it may be formed at a plurality of locations.
In the above embodiment, as shown in FIG. 1, only the lock ring 7 is accommodated in the lock ring accommodation groove 4, but the lock ring 7 and the lock ring 7 are arranged on the outer peripheral side of the lock ring 7. The rubber ring for centering the lock ring provided may be accommodated.

  In the above embodiment, as shown in FIG. 1, the depressions 52 and the gap maintaining member 53 are provided on both front and back end faces of the press wheel 17, but may be provided only on either one of the front and back end faces of the press wheel 17.

1, 12 Tube 2 Receiving port 4 Lock ring receiving groove 6 Dividing portion 7 Lock ring 7d End portion 13 Inserting port 14 Inserting projection 22 Protruding portion 23 Receiving opening portion 24 Defect portion 30 Spacer 31 Expanding diameter maintaining portion 32 Handle portion 34 Insertion groove (insertion part)
35a, 35b Guide surface 36 Restricting surface 42 Non-slip member A Circumferential direction B Pipe axis direction C Radial direction D Insertion direction T Thickness of diameter expansion maintaining portion

Claims (5)

An annular lock ring that is housed in a lock ring housing groove formed on the inner periphery of the receiving port in one pipe is expanded in diameter and formed on the outer periphery of the insertion port in the other pipe. A spacer for maintaining the expanded diameter of the lock ring when joining one tube and the other tube by passing the insertion protrusion inside the lock ring and inserting the insertion port into the receiving port. Because
An enlarged diameter maintaining portion that is sandwiched between both ends in the circumferential direction of the divided portion of the lock ring that is expanded in a state of being accommodated in the lock ring accommodating groove, and that can be inserted / removed from the receiving opening side, and maintained the expanded diameter A handle portion continuously provided from the portion to the outside of the receiving opening,
After the insertion port is inserted into the receiving port, it is configured to be able to be collected outside the receiving port opening through the gap between the receiving port and the insertion port.
Insertion parts are formed on both sides of the expanded diameter maintaining part,
The insertion portion has a pair of guide surfaces facing each other in the thickness direction of the diameter expansion maintaining portion,
A spacer characterized in that both end portions in the circumferential direction of the split portion of the lock ring are detachable between a pair of guide surfaces of the insertion portion in the tube axis direction. The insertion portion has a regulating surface that abuts against an end of the lock ring on the receiving opening side from the insertion direction and regulates movement of the spacer in the insertion direction. Spacer. The spacer according to claim 1, wherein the insertion portion is an insertion groove in which an end portion on the insertion direction side of the diameter expansion maintaining portion and both sides of the diameter expansion maintaining portion are opened. A pipe to which the spacer according to any one of claims 1 to 3 is attached,
The lock ring is housed in the lock ring housing groove,
Between the both ends in the circumferential direction in the split part of the lock ring, the diameter expansion maintaining part of the spacer is sandwiched,
A tube characterized in that a handle portion of the spacer is exposed from the inside of the receiving port to the outside of the receiving port opening. On the receiving opening side of the lock ring housing groove, a protrusion protruding inward in the pipe diameter direction is formed facing the lock ring housing groove,
The protrusion is formed with a deficient portion that communicates with the lock ring receiving groove and the receiving opening,
The spacer has a displacement preventing member that can pass through the defect portion in the axial direction of the tube and prevents the defect portion from shifting in the circumferential direction,
5. The tube according to claim 4, wherein the slip preventing member engages with the defect portion in the circumferential direction and is detachable from the defect portion in the axial direction of the tube.

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