JP2005042878A - Pipe joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint structure capable of fastening a pipe by effectively pressing a packing, and sufficiently pressure-contacting and pinching a spigot of the pipe. <P>SOLUTION: In the pipe joint structure, one tapered side surface of a packing body 3a of an isosceles-trapezoidal section is abutted on an inner circumferential surface of a tapered edge part 1d of a pipe joint body 1, a tapered holding piece 4 is abutted on the other tapered side surface 3b of the packing body 3a. Tapered piece parts 6b and 6c on both sides are abutted on an outer circumferential surface of the tapered edge part 1d of the pipe joint body 1 and an outer circumferential surface of the holding piece 4, and a center cylindrical part 6a is abutted on a maximum outside diameter edge part 4a of the holding piece 4 to circumferentially provide a tightening band 6. A spigot of a pipe 2 is inserted in a socket 1c, the tapered edge part 1d of the pipe joint body 1 and the holding piece 4 to be contracted press the packing body 3a by tightening the tightening band 6, and the spigot of the inserted pipe 2 is pressure-contacted and pinched by the elastic deformation to fasten the pipe. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pipe joint structure in which an end insertion opening of a pipe is inserted into a receiving opening at an end of a pipe fitting main body via a packing and both are fastened by fastening means.

As this type of pipe joint structure, there is an example previously proposed (see Patent Document 1).
Japanese Patent Publication No.7-111225

  As shown in FIG. 9, the pipe joint structure of Patent Document 1 includes a pipe joint body 01 having an inner diameter receiving port 01b that is expanded from the center through a stepped portion 01a and has an inner diameter slightly larger than the outer diameter of the steel pipe 02. It has a tip bulging portion 01c whose tip bulges outward.

The packing 03 is composed of a packing body 03a having a cross section of an isosceles trapezoidal shape, a cylindrical portion 03b, and a tip bulging portion 03c.
The fastening band 04 has taper pieces 04b and 04c on both the inner and outer sides in the axial direction of the central cylindrical portion 04a. The central cylindrical portion 04a presses the outer periphery of the packing main body 03a and the tip bulging portion 01c of the pipe fitting main body 01, The outer tapered piece 04b presses the outer tapered side surface of the packing body, and the tip bent portion 04d of the inner tapered piece 04c holds the outer peripheral surface of the receiving port 01b of the pipe fitting main body 01.

  The fastening band 04 is superposed so that one end can slide on the other end, and the fastening band 04 is fastened by screwing the brackets 05 and 05 fixed to both the bolts 06 and nuts into the packing 03. The steel pipe 02 is crimped and clamped through the pipe, and the steel pipe 02 is fastened to the pipe joint body 01.

  Tightening of the fastening band 04 presses the packing 03 and crimps and clamps the steel pipe 02 inserted by elastic deformation, but the axially inner half of the fastening band 04 has a receptacle 01b and a bulging end of the pipe joint body 01 Since the diameter reduction is restricted by the portion 01c, the diameter reduction of the outer half part of the fastening band 04 that presses the packing 03 is also restricted, and the packing 03 can be effectively pressed. There is a possibility that the crimping and clamping of the steel pipe 02 may be insufficient.

The fastening band 04 is asymmetric on both the inner and outer sides in the axial direction, and is troublesome to manufacture.
Also, the brackets 05 and 05 are asymmetrical on both the inside and outside sides, and the fixing position to the fastening band 04 also affects the pressing force to the packing 03. Therefore, it is necessary to ensure accuracy, and the manufacturing cost of the fastening means increases.

  The present invention has been made in view of such a point, and the object of the present invention is to inexpensively provide a pipe joint structure that can effectively press the packing and sufficiently clamp and clamp the insertion port of the pipe. There is in point to offer.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a pipe joint in which an end insertion opening of a pipe is inserted into a receiving opening of an end of a pipe fitting main body via a packing and both are fastened by fastening means. In the structure, both sides of the packing body of the packing are tapered and the cross section has an isosceles trapezoidal shape, and the inner diameter is slightly larger than the outer diameter of the pipe, and the pipe joint body is stepped from the center. A tapered end edge having a diameter that is enlarged and provided with a receiving port having an inner diameter slightly larger than the outer diameter of the tube and the tip of the receiving port is gradually expanded in the same taper shape on one tapered side surface of the packing body, A presser fitting having the same taper shape along the other tapered side surface of the packing body and having an annular part missing, the fastening means being the same as both tapered side surfaces of the packing body symmetrically on both sides of the central cylindrical portion. Tapered piece with tapered shape A tightening band that overlaps so that one end can slide on the other end, and a tightening means that tightens the tightening band in the circumferential direction. One tapered side surface of the packing body is brought into contact with the surface, the tapered presser fitting is brought into contact with the other tapered side surface of the packing body, and the outer peripheral surface of the tapered edge portion of the pipe joint body and the presser fitting The taper pieces on both sides are brought into contact with the outer peripheral surface, the central cylindrical portion is brought into contact with the maximum outer diameter edge of the presser fitting, the fastening band is provided around, and the tube insertion port is inserted into the receiving port. When the fastening band is tightened by the fastening means of the fastening means, the presser fitting whose diameter is reduced with the taper end edge portion of the pipe joint body clamps the packing body to insert the insertion hole of the pipe inserted by elastic deformation. The pipe joint structure was clamped and fastened.

  By tightening the tightening band by the tightening means, the taper piece of the tightening band slides along the taper edge of the pipe joint body to reduce the diameter of the tightening band. The central cylindrical part tightens the maximum outer diameter edge of the presser foot while the part is in contact with the outer peripheral surface of the annular taper presser foot to reduce the diameter of the presser foot. And the packing body with the presser fitting interposed between them can be clamped from both sides by pressing the insertion port of the tube inserted by elastic deformation.

The taper edge of the pipe joint body and the annular taper presser fitting clamped to the tightening band press the inner and outer taper sides of the packing body with an isosceles trapezoidal cross section vertically, so the packing body Since it is elastically deformed so that it is pinched symmetrically and obliquely from both sides and bulges toward the axial center side, the insertion hole of the tube can be securely crimped and clamped.
The fastening band and the fastening means are configured symmetrically on both the inner and outer sides, so that they can be manufactured easily and cost can be reduced.

  The invention according to claim 2 is a pipe joint structure in which an end insertion opening of a pipe is inserted into a receiving opening of an end of a pipe fitting main body via a packing, and both are fastened by fastening means, and the packing main body of the packing The both sides are tapered and the cross section has an isosceles trapezoidal shape, and the inner diameter is slightly larger than the outer diameter of the pipe, and the pipe joint body is expanded from the center through a stepped portion, and the outer diameter of the pipe is increased. A taper edge that is provided with a slightly larger inner diameter and whose tip is gradually increased in the same taper shape on one tapered side surface of the packing body is formed from the center outer circumferential surface of the packing body. The holding means has a presser fitting which is formed of a cylindrical portion having a slightly larger inner diameter and a tapered portion having the same taper shape along the other tapered side surface of the packing body, and the fastening means is provided on both sides of the central cylindrical portion. Symmetrically to the packing book A tightening band that forms a taper piece portion that has the same taper shape as both taper side surfaces and overlaps so that one end portion can slide on the other end portion, and a tightening means that tightens the tightening band in the circumferential direction The taper end edge portion inner peripheral surface of the pipe joint body abuts one taper side surface of the packing body, the taper portion of the presser fitting abuts the other taper side surface of the packing body, and the pipe joint Taper pieces on both sides are brought into contact with the outer peripheral surface of the taper edge of the main body and the outer peripheral surface of the taper portion of the presser fitting, and the central cylindrical part is brought into contact with the cylindrical portion of the presser fitting, so that the fastening band is provided around. The taper portion of the presser fitting that is reduced in diameter with the taper end edge portion of the pipe joint body by inserting the insertion hole of the tube into the receiving port and tightening the fastening band by the fastening means of the fastening means is the packing. Inserted by elastic deformation with pinching the body A pipe joint construction for fastening the insertion opening of the by tube crimped clamping to.

  By tightening the tightening band by the tightening means, the taper piece of the tightening band slides along the taper edge of the pipe joint body to reduce the diameter of the tightening band. The center cylindrical part tightens the cylindrical part of the presser fitting while the part is in contact with the taper part of the presser fitting to reduce the diameter of the presser fitting, and the taper end edge of the axially symmetrical pipe joint body and the taper part of the presser fitting are It is possible to clamp and clamp the insertion port of the tube inserted by elastic deformation by clamping the packing body interposed between the both sides.

The tapered edge of the pipe joint body and the taper part of the presser fitting clamped to the tightening band press the inner and outer taper side surfaces of the packing body with an isosceles trapezoidal cross section, so that the packing body Since it is elastically deformed effectively so as to be squeezed diagonally and bulge toward the center of the shaft, the insertion hole of the tube can be securely crimped and clamped.
The fastening band and the fastening means are configured symmetrically on both the inner and outer sides, so that they can be manufactured easily and cost can be reduced.

  According to the third aspect of the present invention, in the pipe joint structure according to the first or second aspect, the minimum diameter edge portion of the presser fitting whose diameter is reduced by tightening of the tightening band by the tightening means of the tightening means is It is characterized by biting into the outer peripheral surface of the tube.

The packing body is elastically deformed to securely crimp and hold the tube insertion port, and the presser fitting bites into the base of the tube insertion port in the circumferential direction, so that the coaxiality of the pipe coupling body and the tube is firmly maintained. The
Further, it is possible to reliably prevent the pipe from falling off without using a separate retaining member.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
As shown in FIG. 4, the pipe joint body 1 has a cylindrical shape, and a ridge 4b is formed over the circumference in the circumferential direction at the center of the inner circumferential surface of the cylindrical portion 4a. The two sides of the socket are symmetrically formed with receiving openings 1c and 1c, and the tips of the receiving openings 1c and 1c are formed with tapered end edges 1d and 1d that gradually increase in diameter in a tapered manner at an inclination angle of 45 degrees. Yes.

The inner diameter of the protrusion 4 b of the pipe joint body 1 is equal to the inner diameter of the steel pipe 2 that is a connected member, and the inner diameter of the receiving port 1 c of the pipe joint body 1 is slightly larger than the outer diameter of the steel pipe 2.
The packing 3 is made of rubber, and as shown in FIGS. 1 and 2, the packing body 3a has tapered side surfaces 3b and 3b whose both sides are inclined at an angle of 45 degrees to form an isosceles trapezoidal cross section. An annular shape slightly larger than the outer diameter of the steel pipe 2 is formed.

  The packing 3 maintains its inner diameter from the packing main body 3a along the inner peripheral surface of the receiving port 1c of the pipe fitting main body 1, the packing cylindrical portion 3c extends inward in the axial direction, and the tip of the packing cylindrical portion 3c is A tip bulging portion 3d bulging in the axial center direction along the side surface of the protrusion 4b of the pipe joint body 1 is formed.

An annular presser fitting 4 is placed on the packing body 3a from the outside in the axial direction.
The presser fitting 4 has a tapered shape with the same inclination angle of 45 degrees along the tapered side surface 3b of the packing body 3a, and a part of the annular shape is lost as shown in FIG. Become.

  The width of the presser fitting 4 is larger than the width of the taper side surface 3b of the packing body 3a, and the diameter of the maximum diameter edge 4a is larger than the maximum diameter of the taper end edge 1d of the pipe joint body 1 without external force being applied. The diameter of the minimum diameter edge portion 4b is substantially equal to the inner diameter of the packing body 3a, and a tapered end surface 4c is formed which gradually increases in diameter outward from the minimum diameter edge portion 4b.

  As shown in FIG. 1, when the presser fitting 4 is put on the packing body 3a from the outside in the axial direction, the tapered presser fitting 4 comes into contact with the tapered side surface 3b of the packing body 3a, and the outer side of the center outer peripheral surface of the packing body 3a is outside. A space is provided between the tapered edge 1 d of the pipe joint body 1 and the presser fitting 4.

5 and 6 are general views of the fastening means 5.
The fastening band 6 has taper pieces 6b and 6c symmetrically on the both sides in the axial direction of the central cylindrical portion 6a, and is superposed so that one end can slide on the other end.

Brackets 7 and 8 are welded to predetermined locations near both ends of the fastening band 6.
The brackets 7 and 8 have leg portions 7b, 7b, 8b, and 8b extending in a centrifugal direction at an angle of 90 degrees from the central cylindrical portions 7a and 8a, and the leg portions 7b, 7b, 8b, and 8b are tightening bands. The six taper pieces 6b and 6c are spot-welded.

  The end portion of the fastening band 6 to which one bracket 7 is welded forms a superposed portion 6d whose tip is slightly larger in diameter than the welded portion of the bracket 7.

  When the tightening band 6 is formed into a ring shape and the one end overlapping portion 6d is overlapped so that it can slide on the other end portion, the brackets 7 and 8 face each other and are sandwiched between the leg portions 8b and 8b on both sides of one bracket 8. Then, the hexagon socket head bolt 9 inserted from the other bracket 7 through the washer 11 is screwed into the nut 10 applied to the central cylinder portion 8a. The diameter can be reduced and tightened.

Using the fastening means 5 as described above, the fastening band 6 is wound around the taper edge 1d of the pipe joint body 1 and the outer periphery of the presser fitting 4.
As shown in FIG. 1, the taper piece 6 c on the inner side in the axial direction of the fastening band 6 is in sliding contact with the outer peripheral surface of the taper end edge 1 d of the pipe joint body 1, and the taper piece 6 b on the outer side in the axial direction is the presser fitting 4. The presser fitting 4 can be held in contact with the outer peripheral surface of the presser.

  In this way, the packing cylindrical portion 3c of the packing 3 is fitted into the receiving port 1c of the pipe joint body 1, the presser fitting 4 is put on the packing body 3a from the outside in the axial direction, the fastening band 6 of the fastening means 5 is wound, and the bolt 9 Are screwed into the nut 10 and loosely tightened to form a temporarily assembled state in which the central cylindrical portion 6a of the fastening band 6 is in contact with the maximum diameter edge portion 4a of the presser fitting 4 as shown in FIG.

An insertion port of the steel pipe 2 is inserted into the receiving port 1c through the packing 3 of the pipe joint body 1 in the temporarily assembled state (see FIG. 3).
When the insertion hole of the steel pipe 2 is inserted, the taper end surface 4c spreading outside the opening of the presser fitting 4 guides the insertion hole tip of the steel pipe 2 to facilitate the insertion, and the work efficiency can be improved.

  Since the outer diameter of the steel pipe 2 is slightly smaller than the inner diameter of the packing 3, the steel pipe 2 is easily inserted, and the tip is brought into contact with the tip bulging portion 3 d of the packing 3 as shown in FIG. 3.

  When the bolt 9 of the fastening means 5 is further screwed into the nut 10 and the fastening band 6 is fastened in this state, the inner taper piece 6c of the fastening band 6 is connected to the taper edge 1d of the pipe joint body 1. Since the diameter of the tightening band 6 is reduced while the outer tapered piece 6b is in contact with the taper 4b of the presser fitting 4 and the outer cylindrical piece 6b is in contact with the presser metal 4, the presser metal fitting with which the central cylindrical part 6a of the tightening band 6 is in contact 4 is pressed toward the center to reduce the diameter of the presser fitting 4 by the tightening allowance of the missing portion 4s, and the packing body 3a is pinched with the tapered end edge 1d of the pipe joint body 1.

  The tapered edge 1d of the pipe joint body 1 and the presser fitting 4 fastened to the fastening band 6 have inner and outer tapered side surfaces 3b and 3b having an inclination angle of 45 degrees of the packing body 3a having an isosceles trapezoidal cross section, respectively. Since the packing body 3a is pressed perpendicularly, the packing body 3a is elastically deformed so as to be squeezed symmetrically from both sides at an angle of 45 degrees and bulge toward the center of the shaft. As shown in FIG. The mouth can be securely crimped.

When the diameter of the presser fitting 4 advances, the minimum diameter edge portion 4c bites into the outer peripheral surface of the steel pipe 2 as shown in FIG.
Therefore, the water tightness of the packing 3 can be secured, and the steel pipe 2 can be firmly connected to the pipe joint body 1 by a simple operation without using a separate retaining member by the biting of the presser fitting 4, and by the fluid pressure. The steel pipe 2 can be reliably prevented from falling off from the pipe joint body 1.

  Further, since the presser fitting bites into the base of the insertion hole of the steel pipe 2 in the circumferential direction, the coaxiality of the pipe joint body 1 and the steel pipe 2 is firmly maintained in combination with the crimping and clamping of the insertion hole of the steel pipe 2 by the packing 3. The structure is difficult to bend.

  In particular, by preliminarily assembling the packing 3 and the presser fitting 4 with the fastening band 6 on the tapered edge 1d of the pipe joint body 1 in advance, the steel pipe 2 is inserted into the receiving port 1c of the pipe joint body 1 temporarily assembled at the site. If the insertion band is inserted and the tightening band 6 is tightened, it can be easily fastened and work efficiency can be improved.

  FIG. 4 shows the connection state of the steel pipe of the pipe joint body 1, in which the right side is a cross-sectional view and the left side is a side view. Referring to the left side view of FIG. The tightening state of the band 6 can be confirmed by visual observation of the gap between the missing portions 4 s that are the tightening allowance of the presser fitting 4 protruding from the tightening band 6.

That is, in the temporarily assembled state before tightening of the fastening band 6 shown in FIG. 1, the gap between the missing parts 4 s is wide, but as shown in FIG. 4, the gap between the missing parts 4 s is narrowed by fastening the fastening band 6. It has become.
As described above, since the gap between the missing portions 4s, which is the tightening allowance of the presser fitting 4, can be visually recognized from the outside, it can be easily brought into an optimum tightening state and can be easily operated.

  Since the tip bulging portion 3d of the packing 3 is interposed between the tip of the steel pipe 2 inserted into the receiving port 1c of the pipe joint main body 1 and the stepped portion 1b of the pipe joint main body 1, there is a direct collision between the two. Can be avoided to prevent the occurrence of a collision sound.

  The fastening means 5 including the fastening band 6 as well as the brackets 7 and 8 are configured so that the inside and outside in the axial direction are symmetrical to each other, so that the manufacture is easy and the cost can be reduced.

In addition, as a fastening means, the modification as shown in FIG. 7 can be considered.
The fastening band 21 of the fastening means 20 has taper pieces 21b and 21c symmetrically on both the inner and outer sides in the axial direction of the central cylindrical portion 21a in the same manner as the fastening band 6, and one end is on the other end. Polymerizes so that it can slide.

  The brackets 22 and 23 that are welded to predetermined locations near both ends of the fastening band 21 are members of the same shape, and the attachment base 22a that is welded along the outer peripheral surface of the central cylindrical portion 21a of the fastening band 21. The fastening plate portions 22b and 23b extend vertically from the end edges of the mounting base portions 22a and 23a and the side edges of the fastening plate portions 22b and 23b are connected to the reinforcing side plates 22c and 23c. .

  As described above, the brackets 22 and 23 have a structure that is high in both strength and rigidity, and the mounting base portions 22a and 23a are fastened to the fastening plate portions 22b and 22b at predetermined positions on the outer peripheral surface of the central cylindrical portion 21a of the fastening band 21. Weld so that 23b faces each other.

  A nut 25 is attached to the fastening plate portion 22b of one bracket 22 so as to be sandwiched between the reinforcing side plates 22c and 22c on both sides, and penetrated through the washer to the fastening plate portion 23b of the other bracket 23. The bolt 24 is screwed into the nut 25 and tightened.

  The brackets 22 and 23 have the same simple shape, and there are few spot welds to the tightening band 21, which is easy to manufacture and can reduce the cost, and the strength necessary for tightening can be easily secured. .

Next, another embodiment will be described with reference to FIG.
In the present embodiment, the shape of the presser fitting is different, and as shown in FIG. 8, the presser fitting 30 extends in the axial direction by a tapered portion 30a having the same taper shape as the presser fitting 4 and its maximum diameter portion. It has a cylindrical portion 30b that is taken out, and has a missing portion that serves as a tightening margin in a part of the ring.
Other members are the same as those in the above embodiment, and therefore the same reference numerals are used.

  FIG. 8 shows that the packing cylindrical portion 3c of the packing 3 is fitted into the receiving port 1c of the pipe joint body 1, the presser fitting 30 is put on the packing body 3a from the outside in the axial direction, the fastening band 6 of the fastening means 5 is wound, and the bolt 9 shows a state in which 9 is screwed into a nut 10 and loosely tightened to be temporarily assembled, and an insertion port of a steel pipe 2 is inserted into a receiving port 1 c through a packing 3.

In this temporarily assembled state, the cylindrical portion 30b of the presser fitting 30 is in contact with the central cylindrical portion 6a of the fastening band 6 at its wide outer peripheral surface, and there is a space between the packing main body 3a.
Since the presser fitting 30 has a cylindrical portion 30b that is in contact with the fastening band 6 over a wide area, when the fastening band 6 of the fastening means 5 is tightened, the central cylindrical portion 6a of the fastening band 6 becomes the presser fitting. It is possible to easily reduce the diameter of the presser fitting 4 for the tightening allowance of the missing portion by easily pressing the 30 cylindrical portions 30b toward the center.

  The packing body 3a is clamped between the taper portion 30a of the presser fitting 30 and the taper edge 1d of the pipe fitting body 1 by the smooth diameter reduction of the presser fitting 30, and the cross section of the packing body 3a having an isosceles trapezoidal shape is obtained. Both the inner and outer tapered side surfaces 3b, 3b with an inclination angle of 45 degrees are pressed vertically, and the packing body 3a is elastically effective so as to be squeezed from both sides symmetrically at an angle of 45 degrees and bulge toward the center of the shaft. It deform | transforms and the insertion opening of the steel pipe 2 can be crimped | bonded reliably.

In the above embodiment, the presser fitting is an annular member in which a part of the annular shape is lost, but it is also conceivable to use the annular member by dividing it in the circumferential direction.
In the above embodiment, the pipe joint body is a bilaterally symmetric pipe joint with a straight central axis. However, the present invention is applicable to a pipe joint with a bent center, a Y-shaped or T-shaped pipe joint, and the like. Naturally applicable.

  The present invention is applicable to all pipe joints.

It is sectional drawing which showed the temporary assembly state of the pipe joint structure which concerns on one embodiment of this invention. It is a perspective view of a presser fitting. It is sectional drawing which showed the state which inserted the steel pipe in the receptacle of the pipe joint main body of the temporary assembly state. It is the side view made into the partial cross section which showed the state by which the steel pipe was connected with the pipe joint main body. It is a whole side view of a fastening means. It is the same top view. It is a perspective view which shows the modification of a fastening means. It is sectional drawing which showed the state which inserted the steel pipe in the receptacle of the pipe joint main body of the temporarily assembled state of another embodiment. It is the side view made into the partial cross section which shows the conventional pipe joint structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pipe fitting main body, 2 ... Steel pipe, 3 ... Packing, 4 ... Holding metal fitting, 5 ... Fastening means, 6 ... Fastening band, 7, 8 ... Bracket, 9 ... Bolt, 10 ... Nut, 11 ... Washer, 20 ... Fastening means, 21 ... tightening band, 22, 23 ... bracket, 24 ... bolt, 25 ... nut,
30 ... Presser bracket.

Claims (3)

In the pipe joint structure in which the end insertion opening of the pipe is inserted into the receiving opening of the end of the pipe fitting main body through the packing and both are fastened by the fastening means.
The packing body of the packing is tapered on both side surfaces and has an isosceles trapezoidal cross section, forming an annular shape whose inner diameter is slightly larger than the outer diameter of the pipe,
The pipe joint main body is provided with a receiving opening having an inner diameter slightly larger than the outer diameter of the pipe, and the tip of the receiving opening is gradually tapered in the same tapered shape on one tapered side surface of the packing body. Forming a taper edge that is expanded in diameter,
A presser fitting having the same taper shape along the other taper side surface of the packing body and having an annular part missing,
The fastening means is formed by forming a taper piece portion having the same taper shape as both taper side surfaces of the packing body symmetrically on both sides of the central cylindrical portion, and superposing so that one end portion can slide on the other end portion. It consists of a band and tightening means for tightening the tightening band in the circumferential direction.
One tapered side surface of the packing body is brought into contact with the inner peripheral surface of the tapered end edge portion of the pipe joint body, and the tapered presser fitting is brought into contact with the other tapered side surface of the packing body, so that the taper of the pipe joint body is brought into contact. Tapering pieces on both sides are brought into contact with the outer peripheral surface of the end edge portion and the outer peripheral surface of the presser fitting, and a central cylindrical portion is made in contact with the maximum outer diameter edge portion of the presser fitting, and the fastening band is provided around the receiving band. The presser fitting that is reduced in diameter with the taper end edge of the pipe joint body is elastically inserted into the opening by inserting the insertion hole of the pipe into the mouth and tightening the fastening band by the fastening means of the fastening means. A pipe joint structure characterized in that a tube insertion port inserted by deformation is clamped and fastened. In the pipe joint structure in which the end insertion opening of the pipe is inserted into the receiving opening of the end of the pipe fitting main body through the packing and both are fastened by the fastening means.
The packing body of the packing is tapered on both side surfaces and has an isosceles trapezoidal cross section, forming an annular shape whose inner diameter is slightly larger than the outer diameter of the pipe,
The pipe joint main body is provided with a receiving opening having an inner diameter slightly larger than the outer diameter of the pipe, and the tip of the receiving opening is gradually tapered in the same tapered shape on one tapered side surface of the packing body. Forming a taper edge that is expanded in diameter,
A presser fitting having a circular part missing from a cylindrical part having a slightly larger inner diameter than the central outer peripheral surface of the packing body and a tapered part having the same taper along the other tapered side surface of the packing body,
The fastening means is formed by forming a taper piece portion having the same taper shape as both taper side surfaces of the packing body symmetrically on both sides of the central cylindrical portion, and superposing so that one end portion can slide on the other end portion. It consists of a band and tightening means for tightening the tightening band in the circumferential direction.
One tapered side surface of the packing body is brought into contact with the inner peripheral surface of the tapered end edge portion of the pipe joint body, and the tapered portion of the presser fitting is brought into contact with the other tapered side surface of the packing body. Tapering pieces on both sides are brought into contact with the outer peripheral surface of the edge portion and the outer peripheral surface of the taper portion of the presser fitting, the central cylindrical portion is brought into contact with the cylindrical portion of the presser fitting, and the fastening band is provided around the receiving port. The taper portion of the presser fitting, which is reduced in diameter with the taper end edge portion of the pipe joint main body, clamps the packing main body by inserting the pipe insertion hole into the pipe and tightening the fastening band by the fastening means of the fastening means. A pipe joint structure characterized in that a tube insertion port inserted by elastic deformation is clamped and clamped. The pipe joint structure according to claim 1 or 2, wherein a minimum diameter edge portion of the presser fitting whose diameter is reduced by tightening of the fastening band by the fastening means of the fastening means bites into an outer peripheral surface of the pipe. .

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