JP4204337B2 - Pipe fitting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cut tube on the use side or the unused side that is generated when a straight tubular fluid pipe having a specified size carried into a pipe construction site such as waterworks is cut based on a pipe size actually measured on the construction site. The present invention relates to a technique for manufacturing a joint structure having excellent earthquake resistance using a connection pipe in which an outer peripheral surface of an insertion tube portion is formed in a straight tube shape.
[0002]
[Prior art]
Considering plumbing work such as waterworks, most of the work is done by connecting various piping equipment brought into the site based on the design according to a predetermined procedure, but part of it is done at each construction site. A method of cutting a straight tubular fluid pipe carried into the site and connecting the cut pipe based on a difference in dimension between different pipes has been adopted.
[0003]
And in order to comprise the cutting edge part of the cutting tube of the cut object used for the piping dimension in the insertion pipe part of the pipe joint structure excellent in earthquake resistance, as shown, for example in FIG. 10, FIG. At the construction site, a tapered surface 52 for an insertion guide having a smaller diameter toward the distal end side at the cut end portion of the cut tube 50, and a lock ring 53 and a tube shaft fitted and held on the inner peripheral surface of the receiving tube 51 After cutting the annular mounting groove 55 for mounting the C-shaped retaining ring 54 that comes into contact with the core X direction, the C-shaped hole is expanded in the mounting groove 55 of the cut tube 50. The retaining ring 54 is attached, and both ends of the retaining ring 54 and the connecting pieces 56 for retaining to be bridged over the retaining ring 54 are fixed to a predetermined posture by jigs, and the rivets 57 are fixed. The method of fixing and connecting is adopted.
[0004]
In addition, the other cut tube is not used at the construction site of the cutting processing place, and in order to use it at another construction site, it is necessary to perform the same processing as described above at the carry-in destination.
[0005]
[Problems to be solved by the invention]
However, in order to configure the cut end portion of the cut tube 50 into an insertion tube portion having a pipe joint structure having excellent earthquake resistance, it is necessary to perform the above-described complicated processing at the construction site, If the mounting failure of the ring 54 occurs, the intended effect of preventing detachment is greatly reduced. Therefore, it is necessary to process the mounting groove 55 with high accuracy, and a lot of labor is required to mount the retaining ring 54. Therefore, the manufacturing cost of the cut tube 50 has increased, and the processing period has become longer.
[0006]
  The present invention has been made in view of the above circumstances, and its main problem is as follows.Cut tubeAdvantages in terms of cost and construction time of manufacturing a pipe joint structure with excellent earthquake resistance by minimizing complicated processing at the construction site for connecting pipes that have a straight tube-shaped outer peripheral surface The present invention provides a useful pipe joint method that can be implemented in the present invention.
[0007]
[Means for Solving the Problems]
  The characteristic configuration of the pipe joint method according to claim 1 of the present invention is as follows:A joint pipe provided with a receiving pipe part on one end side and an insertion pipe part on the other end side, and a cutting pipe having an outer peripheral surface manufactured by cutting to a predetermined dimension at a construction site and having a straight tubular cutting end part. With a tube,
  An outer peripheral surface of the cut tube that can be inserted and connected with the straight tubular cutting end portion from the tube axis direction to the receiving tube portion of the joint tube, and an inner peripheral surface of the receiving tube portion of the joint tube An elastic sealing material that seals between the tube, a retaining member that can move in the radial direction with respect to the outer peripheral surface of the cut tube, and a retaining member that moves inwardly in the tube radial direction along with the relative detachment movement of both tubes The press wheel equipped with the biting guidance means for biting and moving to the side,
  After connecting the cut end of the cut tube to the receiving tube portion of the joint tube,
  While pulling the push ring and the receiving pipe portion of the joint pipe from the tube axis direction by tightening operation of the fastening means mounted across the push ring externally mounted on the cut pipe and the receiving pipe section of the joint pipe With the tightening connection, the elastic sealing material is pressed in a sealed state with a push ring along with the tightening connection,
  Furthermore, an annular retaining protrusion provided at the distal end portion of the outer peripheral surface of the insertion tube portion of the joint tube, and an inner peripheral surface of another receiving tube portion fitted and connected to the insertion tube portion A locking member capable of expanding and deforming on the diameter-enlarged side provided in the formed annular mounting groove, and an elastic holding ring that holds the locking member in a coaxial core state with the other receiving pipe portion. When the insertion tube portion of the joint tube and the other receiving tube portion move relative to each other by the separation preventing means, they come into contact with each other from the tube axis direction to prevent further separation movement.In the point.
[0008]
  According to the above characteristic configuration, at the construction siteTo the specified dimensionsCuttingProcessed and manufacturedCut tubeIs, Intubation tube(Cut end, the same applies below)A connecting pipe whose outer peripheral surface is formed in a straight tube shape(Cut tube, the same applies hereinafter)Is used as an insertion tube of a pipe joint structure with excellent earthquake resistance, after inserting and connecting the insertion tube portion of the connection tube to the reception tube portion formed on one end side of the joint tube, When the presser wheel and the receiving tube are fastened and fixed by fastening means,UshiDue to the relative proximity movement of the ring and the receiving pipe part in the axial direction of the pipe, the elastic seal material sheathed on the connecting pipe is sealed between the outer peripheral surface of the connecting pipe and the inner peripheral face of the receiving pipe part. Pressed into the state.
[0009]
In a state where the receiving pipe part of the joint pipe and the press ring are fixedly connected, even if an external force in the relative separation direction acts on the connection pipe and the joint pipe due to an earthquake or uneven settlement, the press ring is equipped. The retaining member that has been removed is engulfed and moved inwardly in the pipe radial direction by the engulfing guidance means, and the connection between the connecting pipe and the joint pipe is maintained strongly.
[0010]
  Also, the other end of the joint pipeInsertionPipe part and other fittings connected to itReceptacleEven if an external force in the direction of relative separation acts on the pipe part due to an earthquake or uneven settlement,An annular retaining protrusion provided at the distal end portion of the outer peripheral surface of the insertion tube portion of the joint tube, and an inner peripheral surface of another receiving tube portion that is fitted and connected to the insertion tube portion. A locking member capable of expanding and deforming on the diameter-enlarged side provided in the annular mounting groove, and an elastic holding ring that holds the locking member in a coaxial core state with another receiving pipe portion.Contact with each other from the tube axis direction by the separation prevention meansWith the insertion pipe part of the joint pipe and other receiving pipe partsIt is possible to strongly prevent the movement of separation.
[0011]
Therefore, the insertion tube portion of the connection tube is inserted and connected to the receiving tube portion of the joint tube, and both the tubes are simply secured by the push ring and the fastening means. As processing, it is only necessary to perform simple processing such as deburring and chamfering on one end side of the insertion tube portion.
[0012]
  Therefore, the cut tubeIsAs the processing at the construction site for the connection pipe where the outer peripheral surface of the insertion tube part is formed in a straight tube shape, it is only necessary to perform simple processing such as deburring, etc.By minimizing troublesome processing at the construction site for connecting pipes,Manufacture of a pipe joint structure excellent in earthquake resistance can be carried out advantageously in terms of cost and construction period.
[0013]
  The characteristic configuration of the pipe joint method according to claim 2 of the present invention is as follows:A joint pipe provided with a receiving pipe part on one end side and an insertion pipe part on the other end side, and a cutting pipe having an outer peripheral surface manufactured by cutting to a predetermined dimension at a construction site and having a straight tubular cutting end part. With a tube,
  An outer peripheral surface of the cut tube that can be inserted and connected with the straight tubular cutting end portion from the tube axis direction to the receiving tube portion of the joint tube, and an inner peripheral surface of the receiving tube portion of the joint tube Assembling an elastic sealing material that seals between the outer peripheral surface of the cut tube, a retaining member that can move in the radial direction with respect to the outer peripheral surface of the cut tube, and a fastener that can press the retaining member radially inward After that
  The cut end portion of the cut tube is inserted and connected to the receiving tube portion of the joint tube, and the clamping member is tightened so that the retaining member is caught in the outer peripheral surface of the cut tube, and the fastening tool and the disconnection portion are removed. With the biting guidance means provided between the stopper member and the relative separation movement of both pipes, the stopper member is bitten inwardly in the pipe radial direction,
  Furthermore, an annular retaining protrusion provided at the distal end portion of the outer peripheral surface of the insertion tube portion of the joint tube, and an inner peripheral surface of another receiving tube portion fitted and connected to the insertion tube portion A locking member capable of expanding and deforming on the diameter-enlarged side provided in the formed annular mounting groove, and an elastic holding ring that holds the locking member in a coaxial core state with the other receiving pipe portion. When the insertion tube portion of the joint tube and the other receiving tube portion move relative to each other by the separation preventing means, they come into contact with each other from the tube axis direction to prevent further separation movement.In the point.
[0014]
  According to the above characteristic configuration, at the construction siteTo the specified dimensionsCuttingProcessed and manufacturedCut tubeIs, Intubation tube(Cut end, the same applies below)A connecting pipe whose outer peripheral surface is formed in a straight tube shape(Cut tube, the same applies hereinafter)Is used as an insertion tube of a pipe joint structure with excellent earthquake resistance, and the insertion tube portion of the connection tube is inserted and connected to a receiving tube portion formed on one end side of the joint tube. The material is pressed in a sealed state between the outer peripheral surface of the insertion tube portion and the inner peripheral surface of the receiving tube portion. Next, even if an external force within the normal range is applied by tightening the fastener and moving the retaining member radially from the outer peripheral surface of the connecting pipe, the receiving pipe of the joint pipe The insertion tube portion of the connecting tube does not move away from the portion.
[0015]
In a state where the receiving pipe part of the joint pipe and the insertion pipe part of the connection pipe are fixedly connected, an external force in the relative separation direction acts on the connection pipe and the joint pipe due to an earthquake or uneven settlement. Even so, the biting guide means provided between the fastening tool and the retaining member causes the retaining member in the bitten state to further bite and move inward in the pipe radial direction, and the connecting pipe and the joint pipe Connection is maintained strongly.
[0016]
  Also, the other end of the joint pipeInsertionPipe part and other fittings connected to itReceptacleEven if an external force in the direction of relative separation acts on the pipe part due to an earthquake or uneven settlement,An annular retaining protrusion provided at the distal end portion of the outer peripheral surface of the insertion tube portion of the joint tube, and an inner peripheral surface of another receiving tube portion that is fitted and connected to the insertion tube portion. A locking member capable of expanding and deforming on the diameter-enlarged side provided in the annular mounting groove, and an elastic holding ring that holds the locking member in a coaxial core state with another receiving pipe portion.Contact with each other from the tube axis direction by the separation prevention meansWith the insertion pipe part of the joint pipe and other receiving pipe partsIt is possible to strongly prevent the movement of separation.
[0017]
Therefore, after inserting and connecting the insertion tube portion of the connection tube to the receiving tube portion of the joint tube, it is only necessary to tighten and tighten the fastener to secure both tubes so that the insertion tube portion of the connection tube As for the processing for this, it is only necessary to perform simple processing such as deburring or chamfering on one end side of the insertion tube portion.
[0018]
  Therefore, the cut tubeIsAs the processing at the construction site for the connection pipe where the outer peripheral surface of the insertion tube part is formed in a straight tube shape, it is only necessary to perform simple processing such as deburring, etc.By minimizing troublesome processing at the construction site for connecting pipes,Manufacture of a pipe joint structure excellent in earthquake resistance can be carried out advantageously in terms of cost and construction period.
[0019]
  In the pipe joint method of the present invention,The disengagement prevention means is provided with the flexibility to allow relative movement within a certain range in the tube axis direction between the other end side pipe portion of the joint pipe and the other pipe portion fitted and connected thereto.May.
[0020]
  thisAccording to the present invention, in order to absorb the external force in the tube axis direction caused by earthquakes, uneven settlement, etc., in providing the flexibility to allow relative movement within a certain range in the tube axis direction of both pipe parts, The other end of the joint pipeInsertionPipe part and other fittings connected to itReceptacleBecause it is provided in the separation prevention means configured between the pipe and the pipe,IsAs the processing at the construction site for the connecting pipe, only a simple chamfering process is required, and the manufacture of a pipe joint structure having more excellent earthquake resistance can be advantageously carried out in terms of cost and construction period.
[0021]
  In the pipe joint method of the present invention,The retaining members are assembled at a plurality of locations in the circumferential direction of the press wheel, and the biting tip edges of the retaining members are the same as or substantially the same as the radius of the outer peripheral surface of the connecting tube in the tube axis direction view. It is formed in an arc shape with a radius ofMay.
[0022]
  thisAccording to the above, when the biting tip edge of the retaining member is formed in an arc shape with the same radius as the outer peripheral surface of the connection pipe, the entire biting tip edge of the retaining member is Eat evenly with respect to the outer peripheral surface.
[0023]
Further, when the biting tip edge of the retaining member is formed in an arc shape with a radius slightly larger than the radius of the outer peripheral surface of the connection pipe, the circumferential central portion of the biting tip edge of the retaining member is Although it bites into the outer peripheral surface of a connection pipe first, the difference of the amount of biting in the circumferential center part in the biting tip edge and the amount of biting in the circumferential direction both ends can be made small.
[0024]
Further, when the biting tip edge of the retaining member is formed in an arc shape with a radius slightly smaller than the radius of the outer peripheral surface of the connection pipe, both ends in the circumferential direction of the biting tip edge of the retaining member are Compared to the case where the central part in the circumferential direction of the leading edge of the bite first bites into the outer peripheral surface of the connecting pipe because it bites into the outer peripheral surface of the connecting pipe first, it is easier to disperse the biting force in the circumferential direction. The difference between the amount of biting at both ends in the circumferential direction at the leading edge of the biting and the amount of biting at the central portion in the circumferential direction can be reduced.
[0025]
  Therefore, the shape of the biting tip edge of each retaining member is the cut tube.IsWith economical modifications only based on the outer diameter of the connecting pipe, the anti-corrosion lining layer on the inner peripheral surface of the connecting pipe is cracked or peeled off, while ensuring the specified function of preventing separation. It is possible to satisfactorily suppress the occurrence of such damage.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
1 to 4 show a pipe joint structure and a pipe joint method used for a pipe system of a fluid pipe such as a water pipe or a gas pipe, and a receiving pipe portion 1A formed on one end side of a cast iron joint pipe 1 In addition, the outer peripheral surface of the insertion tube portion 2A is an example of a connection tube 2 formed in a straight tube shape without irregularities, and is formed by a straight tube fluid tube (for example, by centrifugal casting specified in Japanese Industrial Standard (JIS) or the like). The produced cast iron pipe) is cut into a predetermined dimension at the construction site, and the insertion tube portion (cut end portion) 2A on one end side (cut side) of the cut tube 2 on the use side is made into the tube axis X An elastic seal made of an annular synthetic rubber that can be inserted and connected from the direction, and can seal between the inner peripheral surface 1a of the receiving tube portion 1A and the outer peripheral surface 2a of the cut tube 2 to the inserted and connected cut tube 2 The material 3 and a cast iron push ring 4 capable of pressing the elastic sealing material 3 from the tube axis X direction and compressing it into a sealed state (watertight state) Together they are, the fastening means 5 for fixedly connected are provided with drawn together a receiver pipe portion 1A of the junk ring 4 and the joint pipe 1 from the pipe axis X direction.
[0027]
Further, between the insertion tube portion 1B formed on the other end side of the joint tube 1 and the receiving tube portion 6A of the other fluid tube 6 fitted and connected thereto, both the tube portions 1B and 6A are pipes. Detachment preventing means A for preventing further disengagement movement by contacting each other from the tube axis X direction when the relative disengagement movement is performed along the axis X direction, the insertion tube portion 1B of the joint tube 1 and other Bending prevention means C for maintaining the receiving pipe portion 6A of the fluid pipe 6 in a coaxial core state, and a circle capable of sealing between the outer peripheral surface of the insertion pipe portion 1B and the inner peripheral surface of the receiving pipe portion 6A A plurality of elastic sealing members 10 made of synthetic rubber are provided on the outer peripheral surface of the insertion tube portion 1B of the joint tube 1 and at equal intervals in the circumferential direction (four in the embodiment). ) Is formed with a joining projection 1E that comes into contact with the end face of the receiving pipe portion 6A from the tube axis X direction.
[0028]
The fastening means 5 includes bolt insertion holes 1b formed at a plurality of locations in the circumferential direction of the connecting flange portion 1C formed integrally with the end portion of the receiving pipe portion 1A of the joint pipe 1 and the outer peripheral surface of the press ring 4. Inserted across bolt insertion holes 1b and 4a facing each other in the tube axis X direction, among the bolt insertion holes 4a of the connecting projection piece 4A formed to project at a plurality of circumferential positions (eight locations in the present embodiment). A T-shaped bolt 5A and a nut 5B screwed to the screw shaft portion of the bolt 5A. The pusher 4 and the receiving pipe of the joint pipe 1 associated with the tightening operation of the bolt 5A and nut 5B. The pusher 4 and the receiving pipe part 1A of the joint pipe 1 are fastened and fixed by relative proximity movement with the part 1A in the pipe axis X direction, and formed at one end of the pusher wheel 4 in the pipe axis X direction. The elastic seal member 3 is compressed and deformed by the annular seal pressing portion 4B, Sealing between the outer peripheral surface 2a of the inserted pipe portion 2A of the inner peripheral surface 1a and cut pipe 2 of the tube portion 1A.
[0029]
The presser wheel 4 is integrally formed in an annular shape that can be externally fitted to the insertion tube portion 2A of the cut tube 2 from the tube axis X direction, and is equally spaced in the circumferential direction on the inner peripheral surface side. In addition, in a plurality of locations (eight locations in the present embodiment), recesses 4C that open inward in the tube diameter direction are formed, and in each recess 4C, a metal that can bite into the outer peripheral surface 2a of the cut tube 2 The made-in retaining member 7 is mounted so as to be able to bite and move inwardly in the tube radial direction, and between the retaining member 7 and the pusher wheel 4, the receiving tube portion 1 </ b> A of the joint tube 1 and the cutting tube 7. A biting guidance means B is provided for biting and moving the retaining member 7 inwardly in the pipe radial direction along with the relative detachment movement with respect to the pipe 2.
[0030]
The biting guidance means B includes an inclined receiving surface 7C having a larger diameter toward the receiving tube portion 1A side formed on the circumferential center portion of the outer side surface of the retaining member 7, and an orthogonal direction to the inclined receiving surface 7C ( And the screw holes 4b formed in the portions facing the respective recesses 4C of the press wheel 4 along the vertical direction), and by screwing into the respective screw holes 4b from the outside in the radial direction, through the inclined receiving surface 7C. The retaining member 7 is composed of a pressing bolt 8 that is an example of a pressing screw member that presses the retaining tube 7 toward the outer peripheral surface 2a side of the cut tube 2, that is, inward in the tube radial direction.
[0031]
As shown in FIG. 4, triangular projections 7 </ b> A and 7 </ b> B that are continuous in the circumferential direction are integrally formed at both ends of the inner side surface (inner circumferential surface) of each retaining member 7 in the tube axis X direction. The length of each biting protrusion 7A, 7B in the pipe circumferential direction is the same or substantially the same, and the biting tip edge of each biting protrusion 7A, 7B is viewed in the tube axis X direction. The cut tube 2 is formed in an arc shape with a radius R that is the same or substantially the same as the radius R1 of the outer peripheral surface 2a.
[0032]
That is, the radius R for forming the biting tip edges of the biting protrusions 7A and 7B in an arc shape, when the radius of the outer peripheral surface 2a of the cut tube 2 is R1, (less than R1 + 2 mm) to (R1-2 mm) In the range of (R1 + 1 mm) to (R1-1 mm), and most preferably the same diameter as R1.
[0033]
When the leading edge of the biting protrusions 7A and 7B is formed in an arc shape with a slightly larger radius R that is less than +2 mm than the radius R1 of the outer peripheral surface 2a of the cut tube 2, the biting protrusion 7A 7B, the central portion in the circumferential direction of the leading edge of the bite 7B first bites into the outer peripheral surface 2a of the cut tube 2, but the biting amount at the central portion in the circumferential direction and the biting at both ends in the circumferential direction at the leading edge of the bite The difference in amount can be reduced, and the biting tip edges of the biting projections 7A and 7B are formed in an arc with a slightly larger radius R within +1 mm than the radius R1 of the outer peripheral surface 2a of the cut tube 2 When it is done, the difference between the amount of biting at the central portion in the circumferential direction and the amount of biting at both end portions in the circumferential direction at the leading edge of the biting can be further reduced.
[0034]
Further, when the leading edge of the biting protrusions 7A and 7B is formed in an arc shape with a slightly smaller radius R within -2 mm than the radius R1 of the outer peripheral surface 2a of the cut tube 2, the biting protrusion Since both end portions in the circumferential direction of the leading edge of 7A and 7B bite into the outer peripheral surface 2a of the cut tube 2 first, the central portion in the circumferential direction of the biting tip edge first bites into the outer peripheral surface 2a of the cut tube 2 Compared to the case, it is easy to disperse the biting force in the circumferential direction, and the difference between the biting amount at the circumferential end of the biting tip edge and the biting amount at the circumferential central portion is reduced. Furthermore, when the biting tip edges of the biting protrusions 7A and 7B are formed in an arc shape with a radius R slightly smaller than -1 mm than the radius R1 of the outer peripheral surface 2a of the cut tube 2, The difference between the amount of biting at both ends in the circumferential direction and the amount of biting at the center in the circumferential direction at the leading edge of the biting It can be reduced to.
[0035]
Further, when the biting tip edges of the biting projections 7A and 7B are formed in an arc shape with the same radius R as the radius R1 of the outer peripheral surface 2a of the cut tube 2, the biting of the biting projections 7A and 7B The entire leading edge will bite evenly with respect to the outer peripheral surface 2a of the cut tube 2, and the biting amount at the circumferential center of the biting tip edge is equal to the biting quantity at both circumferential ends. can do.
[0036]
Therefore, it is possible to satisfactorily suppress the occurrence of damage such as cracking or peeling in the corrosion-resistant lining layer 9 applied to the inner peripheral surface of the cut tube 2 while reliably exhibiting a predetermined separation preventing function. it can.
[0037]
Further, as shown in FIG. 4, the angle θ formed by the screw shaft core (screw shaft core) Z of the pressing bolt 8 and the vertical line Y perpendicular to the tube shaft core X is 15 to 11 degrees. Within an angle range, preferably within an inclination angle range of 14-12 degrees, most preferably an inclination angle of 13 degrees.
[0038]
And by the external force to the detachment direction resulting from an earthquake, unequal subsidence, etc., the front-end | tip part of the press volt | bolt 8 screwed by the push ring 4 and the inclination receiving surface 7C of the retaining member 7 are the pipe axis X direction. When the relative movement is performed, the amount of the retaining member 7 that is radially inward relative to the relative movement amount can be appropriately reduced. Therefore, the push wheel 4 can be reduced in size in the tube axis X direction (smaller width). However, it is possible to satisfactorily suppress the occurrence of damage such as cracking and peeling in the corrosion-resistant lining layer 9 of the cut tube 2.
[0039]
As shown in FIG. 1, the separation preventing means A is formed in an annular mounting groove 6a formed on the inner peripheral surface of the receiving pipe portion 6A of another fluid pipe 6 as viewed in the tube axis X direction. The metal locking member 12 that is elastically deformable on the diameter-expanded side formed in a substantially C-shape in FIG. 5 and the locking member 12 coaxial with the receiving pipe portion 6A in a state that allows the diameter-expanding deformation thereof. The elastic holding ring 13 that holds the core is mounted, and both pipe portions 1B and 6A are formed at the outer peripheral surface of the insertion tube portion 1B of the joint tube 1 due to an earthquake, uneven settlement, or the like. When the relative disengagement movement exceeds a certain level, an annular retaining protrusion 1D that abuts against the locking member 12 from the direction of the tube axis X and prevents further disengagement of both the tube portions 1B and 6A is provided. It is integrally formed.
[0040]
As shown in FIG. 1, each of the bending prevention means C is formed on the outer peripheral surface of the insertion tube portion 1B of the joint pipe 1 and the joining projection 1E and the circumferential intermediate portions thereof. Are integrally formed with a protrusion 1F having a protrusion margin smaller than that of the bonding protrusion 1E, and the receiving tube portion 6A is elastic on the diameter-expanding side in contact with the plurality of protrusion portions 1F of the insertion tube portion 1B. It is composed of a deformable metal bending prevention ring 15 and a plurality of set bolts 16 that are deformed by reducing the diameter by pressing a plurality of circumferential locations of the bending prevention ring 15 inward in the pipe radial direction. .
[0041]
Further, an annular seal holding groove 6b for holding the elastic seal material 10 is formed on the inner peripheral surface of the receiving pipe portion 6A and between the bend preventing ring 15 and the locking member 12. Is formed.
[0042]
Next, the cut pipe joint method will be described.
First, the elastic sealing material 3 that seals between the inner peripheral surface 1a of the receiving pipe portion 1A is not damaged at one side end of the cut tube 2 on the use side that is manufactured by cutting into a predetermined dimension at the construction site. In addition, after the chamfering process is performed so that the corner of one end of the cut tube 2 becomes an annular inclined surface 2b so that the insertion tube portion 2A of the cut tube 2 can be smoothly inserted, The insertion tube portion 2A of the tube 2 is externally provided with the elastic seal material 3 and the push ring 4 to which the retaining member 7 is attached, and the insertion tube portion 2A of the cut tube 2 is formed on one end side of the joint tube 1. It is inserted and connected to the received receiving pipe portion 1A from the tube axis X direction.
[0043]
Next, when the connecting flange portion 1C of the joint pipe 1 and the connecting protrusion 4A of the press ring 4 are tightened and fixed while being pulled from the tube axis X direction with the bolts 5A and nuts 5B of the fastening means 5, the bolts 5A and nuts 5B are fixed. As a result of the relative proximity movement in the tube axis X direction between the presser wheel 4 and the receiving pipe portion 1A of the joint pipe 1 in accordance with the tightening operation, the inner peripheral surface 1a of the receiving pipe portion 1A and the insertion pipe portion of the cut pipe 2 The elastic sealing material 3 that has entered between the outer peripheral surface 2a of 2A is pressed and compressed from the direction of the tube axis X by the seal pressing portion 4B of the pusher wheel 4, and the inner peripheral surface 1a of the receiving pipe portion 1A by the elastic sealing material 3. And the outer peripheral surface 2a of the insertion tube portion 2A of the cut tube 2 are sealed.
[0044]
When the presser wheel 4 and the receiving pipe part 1A of the joint pipe 1 are fixedly connected, the retaining bolts attached to the respective recesses 4C of the pusher wheel 4 by screwing the pressing bolts 8 of the biting guide means B. The member 7 is adjusted so that each of the biting protrusions 7 </ b> A and 7 </ b> B bites into the outer peripheral surface 2 a of the cut tube 2.
[0045]
In this state, since the tip of each pressing bolt 8 is in contact with the inclined receiving surface 7C of the retaining member 7, if an external force in the direction of separation caused by an earthquake or unequal subsidence acts, the receiving of the joint pipe 1 With the relative detachment movement of the mouth tube portion 1A and the cut tube 2, each retaining member 7 is bitten and moved inward in the tube radial direction, and the connection between the receiving tube portion 1A of the joint tube 1 and the cut tube 2 Is strongly maintained.
[0046]
On the other hand, the joint pipe 1 is inserted into the receiving pipe portion 6A of another fluid pipe 6 to which the bending prevention ring 15, the set bolt 16, the elastic seal material 10, the locking member 12, and the elastic holding ring 13 are attached. When the mouth tube portion 1B is inserted, the locking member 12 expands against the elastic restoring force of the elastic retaining ring 13 by the tapered insertion guide surface 1d formed on the retaining protrusion 1D of the mouth tube portion 1B. When the diameter is changed and the retaining projection 1D of the insertion tube portion 1B passes, the locking member 12 returns to the original state, and the retaining projection 1D and the locking member 12 of the insertion tube portion 1B are connected to the tube axis. Since the engagement is possible in the core X direction, the relative detachment movement between the insertion tube portion 1B of the joint tube 1 and the receiving tube portion 6A of the other fluid tube 6 is strongly prevented.
[0047]
Further, as shown in FIG. 1, in a state where the joining projection 1E of the insertion tube portion 1B is in contact with the end surface of the receiving tube portion 6A, the retaining projection 1D and the locking member 12 of the insertion tube portion 1B A slight gap (gap) S is formed between them, and the tube axis X between the insertion tube portion 1B of the joint tube 1 and the receiving tube portion 6A of the other fluid tube 6 within the range of the flexibility S. It is configured to allow relative movement within a certain range in the direction.
[0048]
[Second Embodiment]
In the first embodiment described above, the separation preventing means A is connected to the insertion tube portion 1B on the other end side of the joint tube 1 and the receiving tube of the other fluid tube 6 fitted and connected thereto from the tube axis X direction. Although some flexibility S allowing relative movement within a certain range in the tube axis X direction with respect to the portion 6A is provided, as shown in FIG. 5, the bending prevention means C and the joining protrusion in the first embodiment 1E may be deleted, and the accommodation S which permits large expansion and contraction of both the pipe portions 1B and 6A may be configured.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
[0049]
[Third Embodiment]
6 is provided between the insertion tube portion 1B formed on the other end side of the joint tube 1 and the reception tube portion 6A of another fluid tube 6 fitted and connected thereto from the tube axis X direction. Another embodiment of the detachment preventing means A is shown, and an annular mounting groove 6c formed on the inner peripheral surface of the receiving pipe portion 6A of the other fluid pipe 6 is substantially C-shaped when viewed from the tube axis X direction. A metal locking member 18 that can be elastically deformed is mounted on the enlarged diameter side formed on the inner surface of the locking member 18, and a plurality of circumferential positions of the locking member 18 are pressed inward in the radial direction. A plurality of set bolts 19 whose diameter is deformed so that the surface side portion engages in an annular locking groove 1e formed on the outer peripheral surface of the insertion tube portion 1B are provided at a plurality of locations in the circumferential direction of the mounting groove 6c. And is screwed into a screw hole 6d formed in the receiving pipe portion 6A in a state of communicating with the outer pipe, and protrudes outward from the outer peripheral surface of the receiving pipe portion 6A. Cap 20 is screwed into the projecting thread portion of the set bolt 19 that.
[0050]
In the third embodiment, the connecting flange portion 6B formed integrally with the end portion of the receiving pipe portion 6A is provided between the outer peripheral surface of the insertion tube portion 1B and the inner peripheral surface of the receiving pipe portion 6A. A push ring 22 that presses an annular elastic sealing material 21 that can seal the tube from the tube axis direction to a sealed state is fixedly connected via a plurality of bolts 23 and nuts 24 in a detachable manner.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
[0051]
[Fourth Embodiment]
In each of the above-described embodiments, the tube portion on the other end side of the joint tube 1 is configured as the insertion tube portion 1B, and the tube portion of another fluid tube 6 that is fitted and connected from the tube axis X direction to the tube portion 1B. Although it comprised in the pipe part 6A, as shown in FIG. 7, the pipe part of the other end side of this joint pipe 1 is comprised in the receiving pipe part 1G, and it is connected to the other from the pipe axis X direction. The pipe part of the fluid pipe 6 may be configured as the insertion pipe part 6D.
[0052]
To constitute the separation preventing means A provided between the receiving pipe portion 1G formed on the other end side of the joint pipe 1 and the insertion pipe portion 6D of the other fluid pipe 6 fitted and connected thereto. An engagement groove 1f formed on the inner peripheral surface of the receiving pipe portion 1G is made of metal that can be elastically deformed to the enlarged diameter side formed in a substantially C shape when viewed from the tube axis X direction. A member 26 and an elastic holding ring 27 that holds the locking member 26 in a coaxial core state with the receiving tube portion 1G in a state in which the diameter expansion deformation of the member 26 is allowed, and an insertion port for another fluid tube 6 are mounted. At the tip of the outer peripheral surface of the pipe part 6D, when both pipe parts 1G and 6D move relative to each other more than a certain amount due to an earthquake or uneven settlement, the axis X direction of the pipe axis with respect to the locking member 26 An annular retaining protrusion 6E that is in contact with the tube and prevents further disengagement of both the pipe portions 1G and 6D is integrally formed.
[0053]
Further, on the inner peripheral surface of the receiving tube portion 1G, an annular synthetic rubber elastic sealing material 28 that can seal between the outer peripheral surface of the insertion tube portion 6D and the inner peripheral surface of the receiving tube portion 1G. An annular seal retaining groove 1g is formed.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
[0054]
[Fifth Embodiment]
In each of the above-described embodiments, the chamfering process is performed so that the corner of one side end of the cut tube 2 becomes the annular inclined surface 2b, but as shown in FIG. An insertion guide member 29 made of metal or synthetic resin having a tapered insertion guide surface 29a having a smaller diameter on the distal end side and a proximal end side substantially the same as or substantially the same as the outer diameter of the cut tube 2 is used as a tube axis. After fitting and mounting in the press-fit state from the core X direction, the insertion tube portion 2A of the cut tube 2 to which the insertion guide member 29 is mounted is inserted and connected to the reception tube portion 1A of the joint tube 1. Also good.
[0055]
For this reason, the insertion guide surface 29a of the insertion guide member 29 can be used to smoothly perform the insertion and connection operation to the receiving tube portion 1A, and therefore it is necessary to chamfer the insertion tube portion 2A of the cut tube 2. Therefore, it is possible to promote the reduction in the cost of reusing the cut tube 2 and the shortening of the construction period.
[0056]
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
[0057]
[Sixth Embodiment]
FIG. 9 shows that in the piping system of fluid pipes such as water pipes and gas pipes, the receiving pipe part 1A formed on one end side of the cast-iron joint pipe 1 has no irregularities on the outer peripheral surface of the inlet pipe part 2A. An example of a connecting pipe 2 that is formed in a straight tubular shape. A straight tubular fluid pipe (for example, a cast iron pipe manufactured by centrifugal casting specified in the Japanese Industrial Standards (JIS), etc.) is cut to a predetermined size at the construction site. Another pipe joint structure and pipe joint in which an insertion pipe part (cut end part) 2A on one end side (cutting side) of the cut pipe 2 on the use side manufactured by processing is inserted and connected from the direction of the pipe axis X An annular composite for sealing the gap between the outer peripheral surface 2a of the insertion tube portion 2A of the cut tube 2 and the inner peripheral surface 1a of the reception tube portion 1A is shown in the receiving tube portion 1A of the joint tube 1. An elastic sealing material 3 made of rubber, a retaining member 7 capable of biting and moving from the tube diameter direction to the outer peripheral surface 2a of the cut tube 2, and a retaining member 7 having a tube diameter Pressable fasteners 30 are assembled to the inner direction.
[0058]
Further, between the insertion tube portion 1B formed on the other end side of the joint tube 1 and the receiving tube portion 6A of the other fluid tube 6 fitted and connected thereto, both the tube portions 1B and 6A are pipes. Detachment preventing means A for preventing further disengagement movement by contacting each other from the tube axis X direction when the relative disengagement movement is performed along the axis X direction, the insertion tube portion 1B of the joint tube 1 and other Bending prevention means C for maintaining the receiving pipe portion 6A of the fluid pipe 6 in a coaxial core state, and a circle capable of sealing between the outer peripheral surface of the insertion pipe portion 1B and the inner peripheral surface of the receiving pipe portion 6A A plurality of elastic sealing members 10 made of synthetic rubber are provided on the outer peripheral surface of the insertion tube portion 1B of the joint tube 1 and at equal intervals in the circumferential direction (four in the embodiment). ) Is formed with a joining projection 1E that comes into contact with the end face of the receiving pipe portion 6A from the tube axis X direction.
[0059]
On the end side of the receiving pipe portion 1A of the joint pipe 1, there are recessed portions 1H for accommodating the retaining members 7 movably inward in the pipe radial direction at a plurality of positions spaced apart in the circumferential direction. The screw hole 1J formed in the ceiling wall portion of each recess 1H is formed as an example of a fastening tool 30, and the retaining member 7 is placed inward in the tube radial direction from the outer peripheral side of the receiving pipe portion 1A. A pressing bolt that presses in the direction is screwed together, and an annular seal holding groove 1K that holds the elastic sealing material 3 is formed on the inner peripheral surface of the receiving pipe portion 1A.
[0060]
At the center of the outer surface of the retaining member 7 in the circumferential direction, an inclined receiving surface 7C having a larger diameter toward the back side of the receiving tube portion 1A is formed, and the screw hole 1J and the pressing bolt 30 of each recess 1H are It is formed in an inclined posture that can be applied perpendicularly to the inclined receiving surface 7C of the retaining member 7, and between the pressing bolt 30 and the retaining member 7, the receiving tube portion 1A of the joint tube 1 and the cut tube The biting guide means B is configured to bite and move the retaining member 7 toward the inner side in the radial direction of the tube in accordance with the relative detachment movement from the two insertion tube portions 2A.
[0061]
Triangular protrusions 7A and 7B, which are continuous in the circumferential direction, are integrally formed at both ends of the inner side surface (inner peripheral surface) of each retaining member 7 in the tube axis X direction. 7B have the same or substantially the same length in the pipe circumferential direction, and the biting tip edges of the biting protrusions 7A and 7B are the outer peripheral surface 2a of the cut tube 2 in the tube axis X direction view. It is formed in an arc shape with a radius R that is the same or substantially the same as the radius R1.
[0062]
Further, as shown in FIG. 9, the angle θ formed by the screw shaft core (screw shaft core) Z of the pressing bolt 8 and the vertical line Y perpendicular to the tube shaft core X is 15 to 11 degrees. Within an angle range, preferably within an inclination angle range of 14-12 degrees, most preferably an inclination angle of 13 degrees.
[0063]
The above-described detachment preventing means A is configured by an annular mounting groove 6a formed on the inner peripheral surface of the receiving pipe portion 6A of another fluid pipe 6 in a substantially C shape when viewed from the X axis direction of the pipe axis. The formed metal locking member 12 that is elastically deformable on the enlarged diameter side, and elastic holding that holds the locking member 12 in a coaxial core state with the receiving pipe portion 6A in a state in which the diameter expansion deformation thereof is allowed. When the ring 13 is mounted and the pipe parts 1B and 6A are moved relative to and away from the tip of the outer peripheral surface of the insertion pipe part 1B of the joint pipe 1 due to an earthquake or unequal subsidence. An annular retaining protrusion 1D that is brought into contact with the locking member 12 from the tube axis X direction and prevents further movement of both the tube portions 1B and 6A is integrally formed.
[0064]
To constitute the bending preventing means C, a joining projection 1E is provided on each of the outer peripheral surface of the insertion tube portion 1B of the joint pipe 1 and the portion continuing to the joining projection 1E and the circumferential intermediate portion thereof. The protrusion 1F having a smaller protrusion allowance is integrally formed, and the receiving pipe portion 6A is made of a metal bent elastically deformable to the diameter-expanded side contacting the plurality of protrusions 1F of the insertion tube portion 1B. The ring 15 includes a prevention ring 15 and a plurality of set bolts 16 that are deformed by reducing the diameter by pressing a plurality of circumferential portions of the bending prevention ring 15 inward in the pipe radial direction.
[0065]
Further, an annular seal holding groove 6b for holding the elastic seal material 10 is formed on the inner peripheral surface of the receiving pipe portion 6A and between the bend preventing ring 15 and the locking member 12. Is formed.
[0066]
Next, the cut pipe joint method will be described.
First, the elastic sealing material 3 that seals between the inner peripheral surface 1a of the receiving pipe portion 1A is not damaged at one side end of the cut tube 2 on the use side that is manufactured by cutting into a predetermined dimension at the construction site. In addition, chamfering is performed so that a corner of one end of the cut tube 2 becomes an annular inclined surface 2b so that the insertion tube portion 2A of the cut tube 2 can be smoothly inserted, and the joint tube 1 After attaching the elastic sealing material 3, the retaining member 7, and the pressing bolt 30 to the receiving pipe part 1 </ b> A, the insertion pipe part 2 </ b> A of the cut tube 2 is connected to the receiving pipe part 1 </ b> A of the joint pipe 1. When inserted and connected from the X direction, the elastic sealing material 3 is compressed in a sealed state between the outer peripheral surface 2a of the insertion tube portion 2A and the inner peripheral surface 1a of the reception tube portion 1A.
[0067]
Next, by tightening the pressing bolt 30, the retaining member 7 mounted in each recess 1 </ b> H of the receiving tube portion 1 </ b> A has a tube diameter with respect to the outer peripheral surface 2 a of the insertion tube portion 2 </ b> A of the cutting tube 2. Even if an external force within a normal range is applied by biting and moving from the direction, the insertion tube portion 2A of the cut tube 2 does not move away from the reception tube portion 1A of the joint tube 1.
[0068]
In this state, since the tip of each pressing bolt 8 is in contact with the inclined receiving surface 7C of the retaining member 7, if an external force in the direction of separation caused by an earthquake or unequal subsidence acts, the receiving of the joint pipe 1 With the relative detachment movement between the mouth tube portion 1A and the cut tube 2, each retaining member 7 is moved inwardly in the tube radial direction, and the inlet tube portion 1A of the joint tube 1 and the cut tube 2 are inserted. The connection with the pipe portion 2A is strongly maintained.
[0069]
On the other hand, the joint pipe 1 is inserted into the receiving pipe portion 6A of another fluid pipe 6 to which the bending prevention ring 15, the set bolt 16, the elastic seal material 10, the locking member 12, and the elastic holding ring 13 are attached. When the mouth tube portion 1B is inserted, the locking member 12 expands against the elastic restoring force of the elastic retaining ring 13 by the tapered insertion guide surface 1d formed on the retaining protrusion 1D of the mouth tube portion 1B. When the diameter is changed and the retaining projection 1D of the insertion tube portion 1B passes, the locking member 12 returns to the original state, and the retaining projection 1D and the locking member 12 of the insertion tube portion 1B are connected to the tube axis. Since the engagement is possible in the core X direction, the relative detachment movement between the insertion tube portion 1B of the joint tube 1 and the receiving tube portion 6A of the other fluid tube 6 is strongly prevented.
[0070]
In addition, in a state where the joining projection 1E of the insertion tube portion 1B is in contact with the end surface of the reception tube portion 6A, there is some flexibility between the retaining projection 1D of the insertion tube portion 1B and the locking member 12 ( Within a certain range in the tube axis X direction between the insertion tube portion 1B of the joint tube 1 and the receiving tube portion 6A of the other fluid tube 6 within the range of the accommodation S. Is configured to allow relative movement.
[0071]
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
[0072]
[Other Embodiments]
(1) In each of the above-described embodiments, the biting guide means B includes the inclined receiving surface 7C formed on the outer surface of the retaining member 7 and the screw hole 4b or the receiving pipe portion 1A formed in the press ring 4. The retaining member 7 is moved to the outer peripheral surface 2a side of the cut tube 2 via the inclined receiving surface 7C by screwing into the screw hole 1J and the screw hole 4b or 1J formed in the outer side in the radial direction. Although it comprises the pressing bolt 8 or 30 to be pressed, the biting guide surface of the same gradient that is in sliding contact with the inclined receiving surface 7C between the inclined receiving surface 7C of the retaining member 7 and the tip of the pressing bolt 8 or 30. You may implement by interposing the metal pressing member provided with.
In short, as the biting guidance means B, as long as the retaining member 7 can be bitten and moved inward in the pipe radial direction along with the relative separation movement of the cut tube 2 and the receiving pipe portion 1A. Any structure may be used.
[0073]
(2) In the first embodiment described above, the pusher 4 is integrally formed in an annular shape that can be externally fitted to the cut tube 2 from the direction of the tube axis X, but there are a plurality of pushers 4 in the circumferential direction. You may comprise from the some division | segmentation press ring body divided | segmented into.
[0074]
(3) In the above-described first to fourth embodiments, the chamfering process is performed so that the corner portion at one side end of the cut tube 2 becomes the annular inclined surface 2b, but such a chamfering process is omitted. May be.
[0075]
(4) In the above-described sixth embodiment, as a joint structure between the insertion tube portion 1B formed on the other end side of the joint tube 1 and the receiving tube portion 6A of another fluid tube 6 fitted and connected thereto. The same connection structure as that of the first embodiment is adopted, but the connection structure of the second embodiment shown in FIG. 5, the connection structure of the third embodiment shown in FIG. 6, and the connection structure of the fourth embodiment shown in FIG. You may implement in combination with any of these.
[0076]
(5) In the above-described sixth embodiment, the chamfering process is performed so that the corner portion of one side end of the cut tube 2 becomes the annular inclined surface 2b. However, as in the fifth embodiment shown in FIG. A metal or synthetic resin provided with a tapered insertion guide surface 29a at one side end of the cut tube 2 having a smaller diameter toward the distal end and a proximal end side that is the same as or substantially the same as the outer diameter of the cut tube 2 After fitting the insertion guide member 29 made from the tube axis X direction in the press-fit state, the insertion tube portion 2A of the cut tube 2 to which the insertion guide member 29 is attached is used as the reception tube portion 1A of the joint tube 1. You may comprise so that it may insert and connect to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view after cutting tube connection showing a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view taken along line II-II in FIG.
FIG. 3 is an enlarged cross-sectional front view of the main part of the press ring
FIG. 4 is an enlarged cross-sectional side view of the main part of the push ring.
FIG. 5 is a cross-sectional side view after cutting tube connection showing a second embodiment of the present invention.
FIG. 6 is a cross-sectional side view after cutting tube connection showing a third embodiment of the present invention.
FIG. 7 is a cross-sectional side view after cutting tube connection showing a fourth embodiment of the present invention.
FIG. 8 is a cross-sectional side view of an essential part after connecting a cut tube showing a fifth embodiment of the present invention.
FIG. 9 is a cross-sectional side view of an essential part after connecting a cut tube showing a sixth embodiment of the present invention.
FIG. 10 is a cross-sectional side view of an essential part showing a conventional cut-tube joint structure.
FIG. 11 is a front view of a retaining ring and a coupling piece after fixed connection;
[Explanation of symbols]
A withdrawal prevention means
B Eating guidance means
S interchangeability
X Tube core
1 Fitting pipe
1A receiving pipe part
1B Tube (Inlet tube)
1G pipe part (receiving pipe part)
1a Inner peripheral surface
2 Cut pipe
2A One end
2a Outer peripheral surface
3 Elastic sealing material
4 wheel
5 fastening means
6 Other fluid pipes
6A Pipe part (receiving pipe part)
6D tube (inlet tube)
7 retaining member
29 Insertion guide member
29a Insertion guide surface
30 Fastener (Pressing bolt)

Claims (2)

A joint pipe provided with a receiving pipe part on one end side and an insertion pipe part on the other end side, and a cutting pipe having an outer peripheral surface manufactured by cutting to a predetermined dimension at a construction site and having a straight tubular cutting end part. With a tube,
The joint tube receiving opening tube portion pipe axis direction from the insertable connecting cut ends of the straight tube of the cut pipe against the inner peripheral surface of the receiving pipe section of the joint pipe and this outer peripheral surface An elastic sealing material that seals between the tube , a retaining member that can move in the radial direction with respect to the outer peripheral surface of the cut tube , and a retaining member that moves inwardly in the tube radial direction along with the relative detachment movement of both tubes The press wheel equipped with the biting guidance means for biting and moving to the side,
After connecting insert the cut end of the cut pipe with respect to the socket pipe portion of the joint pipe,
The fastening operation of the fastening means mounted across the receiver pipe portion of the joint pipe and junk ring which is fitted on the cut pipe, while attracted to the receiver pipe portion of the the junk ring joint pipe from pipe axis direction With the tightening connection, the elastic sealing material is pressed in a sealed state with a push ring along with the tightening connection,
Further, an annular retaining projection provided on the distal end portion of the outer peripheral surface of the inserted pipe portion of the joint pipe, the inner peripheral surface of the other of the receiving pipe section to be fitted and connected to the inserted pipe section A locking member capable of expanding and deforming on the diameter-enlarged side provided in the formed annular mounting groove, and an elastic holding ring that holds the locking member in a coaxial core state with the other receiving pipe portion. by the release preventing means, when the inserted pipe portion of the joint pipe and said another receiver pipe portion are relatively detached moves, tube you prevent further withdrawal movement with Setto each other from pipe axis direction Joint method. A joint pipe provided with a receiving pipe part on one end side and an insertion pipe part on the other end side, and a cutting pipe having an outer peripheral surface manufactured by cutting to a predetermined dimension at a construction site and having a straight tubular cutting end part. With a tube,
The joint tube receiving opening tube portions in pairs to the pipe axis direction from the insertable connecting cut ends of the straight tube of the cut pipe, the inner periphery of the receiving pipe section of the joint pipe and this outer peripheral surface An elastic sealing material that seals between the surfaces, a retaining member that can move in a radial direction with respect to the outer peripheral surface of the cut tube , and a fastener that can press the retaining member radially inward. After attaching
Insert the cut end of the cut pipe was connected to the receiver pipe portion of the joint pipe, with Maseru喰込the retaining member is operated tightening the fastener to the outer peripheral surface of the cut pipe, fastener and unplug With the biting guidance means provided between the stopper member and the relative separation movement of both pipes, the stopper member is bitten inwardly in the pipe radial direction,
Further, an annular retaining projection provided on the distal end portion of the outer peripheral surface of the inserted pipe portion of the joint pipe, the inner peripheral surface of the other of the receiving pipe section to be fitted and connected to the inserted pipe section A locking member capable of expanding and deforming on the diameter-enlarged side provided in the formed annular mounting groove, and an elastic holding ring that holds the locking member in a coaxial core state with the other receiving pipe portion. by the release preventing means, when the inserted pipe portion of the joint pipe and said another receiver pipe portion are relatively detached moves, tube you prevent further withdrawal movement with Setto each other from pipe axis direction Joint method.

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