JP4394034B2 - Synthetic resin pipe connection method - Google Patents

Description

The present invention relates to a connection method of a synthetic resin tube.

  Conventionally, adhesives are used to connect synthetic resin pipes such as hard vinyl chloride pipes, but the work is easily affected by weather conditions, and if there is insufficient insertion or curing, the pulling strength in the axial direction Since there is a risk that the connection location may be disconnected due to water pressure in the pipe or other pulling force, the synthetic resin pipe may be avoided in indoor piping.

  Therefore, in a pipe joint for joining plastic pipes, the pipe ends of two plastic pipes facing each other with the pipe axis aligned are commonly inserted into the joint body, and the outer circumference of the plastic pipe is separated from the pipe ends by a desired distance. A lock ring that meshes with the outer peripheral surface of the plastic tube between the moving flange that is externally fitted to the surface is jointed with an urging means that can be expanded and contracted within a certain distance together with the plastic tube and that cannot be detached by a wedge action. A pipe joint for a plastic pipe (for example, Patent Document 1) in which a body and a moving flange are fastened is disclosed.

  In addition, there is a joint body with a sleeve projecting a seal packing that closes and seals against the inner surface of the resin pipe when the resin pipe is inserted, and a split ring-shaped chuck ring partially cut in the axial direction. There is a resin pipe joint structure (for example, Patent Document 2) comprising a pressing ring having an inner surface shape capable of reducing the diameter of the chuck ring and fastening means such as bolts and nuts for pressing the pressing ring toward the joint body. It is disclosed.

Further, it is a soft resin pipe joint such as a polyethylene pipe, and includes a core having an insertion part that is inserted through the tip of the soft resin pipe, and a band that is clamped from around the insertion part across the soft resin pipe. While a ring-shaped protrusion is provided on the outer peripheral surface of the part, a joint for a soft resin pipe (for example, Patent Document 3) in which a protrusion is provided on the inner peripheral surface of the band at a position corresponding to the protrusion. It is disclosed.
JP-A-11-101384 JP 2002-106779 A JP 2000-220786 A

  In all of the above patent documents, a mechanical joint is used to tighten a band or the like to prevent the connection portion from coming off. With such a connection method, attention is paid to the installation of a sealing material such as rubber, and the tightening force is inadequate. If it is uniform or insufficient, the retaining effect is lowered, and further, when the sealing material or the metal band is deteriorated due to a change with time, there is a possibility that the water-stopping property of the connection portion is lowered.

Accordingly, the present invention is excellent in workability, and to provide a connection method of a synthetic resin tube capable of holding a stable joined state for a long time.

The invention of claim 1 is a method of connecting a synthetic resin pipe in which a pipe end insertion opening of one synthetic resin pipe is inserted into a pipe end receiving opening of the other synthetic resin pipe and connected , The outer peripheral surface of the reduced outer peripheral portion is formed with an engagement portion, and a shape retaining member is provided on the inner periphery of the distal end side of the tube end insertion port. The tube end receiving port is heated using a band that is externally engaged and engaged with the tube end insertion side and the tube end receiving side, and a tightening means that clamps between the two bands. The reduced outer peripheral portion of the tube end insertion port is press-fitted into the end receiving port to widen the tube end receiving port, and the inner periphery of the tube end receiving port and the reduced outer peripheral portion are bonded and heated. By pressing the reduced outer peripheral portion into the tube end receiving port, the tube end receiving port is expanded along the reduced outer peripheral portion, and the expanded tube end receiving member is expanded. Outer peripheral enlarged portion engages the other of said band, a connection method for engaging one of said band to said engaging portion.

According to a second aspect of the present invention , a belt-like bulge is provided on the outer surface of the base end side of the reduced outer peripheral part, and the engagement part is formed on the base end side of the bulge part and the bulge is formed. In this connection method, a stepped portion is formed on the distal end side of the protruding portion, and a connection is made between the distal end surface of the tube end receiving port and the stepped portion so as to maintain an interval .

  According to the configuration of claim 1, the tube end insertion port and the tube end are formed by press-fitting the tube end insertion port into the tube end reception port and bonding the tube end reception port and the tube end insertion port. The insertion opening is bonded in a pressure contact state, and high joint strength is obtained at the connection location.

Moreover, according to the structure of Claim 1 , the retaining effect improves by tightening using a band.

Moreover, according to the structure of Claim 1 , a pipe end receptacle and a pipe end insertion port are adhere | attached in a press-contact state, and high joint strength is obtained in a connection location.

Moreover, according to the structure of Claim 1 , the retaining effect improves by tightening using a band. Further, since the band engages with the outer peripheral enlarged portion expanded by the press fitting of the tube end receiving port, it is not necessary to provide a separate engaging portion on the outer periphery of the other synthetic resin tube.

According to the second aspect of the present invention, the connection is made between the distal end surface of the tube end receiving port and the stepped portion so as to maintain a gap.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, by the conventional adopt a connection method different synthetic resin tube, how to connect non-conventional plastic tube is obtained, describing respectively the connection method of the synthetic resin tube.

  Hereinafter, Embodiment 1 of the guard fence of the present invention will be described with reference to FIGS. As shown in the figure, the connection structure of this example is a structure that connects a joint 1 that is one synthetic resin pipe and a synthetic resin pipe 2 that is the other, and the joint 1 and the synthetic resin pipe 2 are hard chloride. Made of vinyl. The joint 1 has a main body 3 thicker than the synthetic resin pipe 2, and has pipe end insertion holes 4 at both ends of the main body 3, respectively. An engagement step portion 6 that is an engagement portion is formed on the outer surface of the main body 3 so as to bulge out on the outer surface of the main body 3. The part 6 is located on the base end side of the bulging part 6A provided in a belt shape, and a step part 6B serving as a stopper is formed on the distal end side of the bulging part 6A. Further, a shape retaining member 7 is provided on the inner periphery of the tube end insertion opening 4 on the distal end side. The shape retention member 7 is made of a metal ring or the like, and is formed from the outer periphery side of the tube end insertion opening 4. The tube end insertion port 4 is shaped so as to face the force to be crushed.

  As shown in FIG. 3, the outer diameter D2 of the other synthetic resin pipe 2 is substantially equal to the outer diameter D3 of the main body 3 of the joint 1, and the thickness of the synthetic resin pipe 2 is the same as that of the main body 3 of the joint 1. The tube end receiving port 11 is provided at the tube end of the synthetic resin tube 2, and the inner diameter DN of the tube end receiving port 11 is substantially the same as the distal end outer diameter DS of the tube end inserting port 4. Slightly widely formed. The main body 12 of the synthetic resin tube 2 and the tube end receiving port 11 have the same shape. Therefore, by cutting the synthetic resin tube 2 at an appropriate position of the main body 12, the cut end becomes the tube end receiving port 11.

Next, the retaining device 21 that retains and holds the connection portion between the tube end insertion port 4 and the tube end receiving port 11 will be described. The retaining device 21 includes a band 22 that is externally mounted on the joint 1 and the synthetic resin pipe 2. The band 22 forms two split bands 23, 23 that are divided in the circumferential direction. The flanges 24 and 24 for joining are integrally provided at the end, and the flanges 24 and 24 of the split bands 23 and 23 are tightened with bolts 25 and nuts 26 to thereby divide the split bands 23 and 23 in the circumferential direction. The band 22 is externally attached to the joint 1 and the synthetic resin tube 2. In addition, it is preferable to set the dimensions of the split bands 23 and 23 so that a gap S is generated in the flange portions 24 and 24 in the tightened state. Further, the split band 23 is provided with a plurality of fastening flange portions 27 for fastening the band 22 of the joint 1 and the band 22 of the synthetic resin tube 2, and the band portion 27 of the band 22 of the joint 1 and the band of the synthetic resin tube 2. 22 by inserting a bolt 28 for tightening which is a screw bolt into the flange portion 27, and screwing nuts 29 and 29 to both ends of the bolt 28 to tighten the flange portions 27 and 27. Try to prevent it from coming off. In the joint 1, the band 22 engages with the engagement step portion 6, while the synthetic resin pipe 2 engages with the outer periphery of the pipe end receiving port 11 that is expanded as described later. That is, the band 22 engaged with the engagement step portion 6 engages the outer end of the expanded pipe end receiving port 11 so as to be able to transmit a force pushing the tube end insertion port 4 toward the synthetic resin tube 2. The band 22 that engages is engaged so as to be able to transmit a force that pushes the tube end receiving port 11 of the synthetic resin tube 2 to the joint 1 side. The bolt 28 and the nuts 29 and 29 are fastening means.

  Next, the connection method between the joint 1 and the synthetic resin pipe 2 will be described. According to a regular method, the outer circumference of the pipe end insertion port 4 of the joint 1 and the inner circumference of the pipe end receiving port 11 of the synthetic resin pipe 2 are dried. Wipe with a cloth, especially to remove oil and moisture. Then, a belt-like heater 30 is wound around the outer periphery of the tube end receiving port 11 and heated until an appropriate temperature is reached. Instead of heating with the belt-shaped heater 30, the tube end receiving port 11 may be heated with warm air from a dryer (not shown). Further, the adhesive 31 is thinly and uniformly applied to the reduced outer peripheral surface 5 which is the outer peripheral surface of the tube end insertion opening 4 and the inner periphery of the tube end receiving port 11. Immediately after the application of the adhesive 31, the tube end insertion port 4 is press-fitted into the tube end receiving port 11, the strip heater 30 is removed, and it is held for a while for natural cooling. When the tube end insertion port 4 is press-fitted into the tube end reception port 11 thus heated, the tube end reception port 11 expands in accordance with the shape of the reduced outer peripheral portion 5, and the tube end reception port 11 is inserted into the tube end insertion port. Crimp to the mouth 4. In that case, after insertion, the tube end insertion port 4 is held in the tube end receiving port 11 so as not to move or apply excessive force. After that, the bands 22 and 22 are respectively sheathed on the outer circumferences of the joint 1 and the synthetic resin tube 2, and these bands 22 and 22 are strongly tightened with the bolts 28 and nuts 29 to prevent them from coming off. Even if the synthetic resin pipe 2 having a constant outer peripheral shape is used, the pipe end receiving port 11 is expanded by joining with heating, so that the expanded outer end of the expanded tube end receiving port 11 The band 22 is engaged, and a predetermined tightening force can be applied to the connection location. Then, after curing for at least the time necessary for the performance of the adhesive 31 to be stable, a water pressure test is performed as necessary to confirm the water stoppage of the connection portion.

When the tube end insertion port 4 is press-fitted into the end receiving port 11, a step portion 6B with which the tip end surface of the receiving port 11 can come into contact is formed, so that the amount of press-fitting of the tube end insertion port 4 is restricted. and which is usually connected so as to keep the distance between the above end face and the stepped portion 6B of the pipe end socket 11.

  If the synthetic resin tube 2 is made of hard vinyl chloride, the tube end receiving port 11 is heated to 70 to 90 ° C., preferably around 80 ° C., and then directly applied with an adhesive 31 for connection and curing. To do.

  With the connection method described above, it has excellent water-stopping properties, corrosion resistance, and chemical resistance. Also, since connection strength can be obtained by press-fitting and adhesion, the load on the retaining device 21 is reduced and mechanical strength is reduced. In addition, it is easy to handle and construct and is economically inexpensive.

Thus, in this embodiment, in the connection structure for a synthetic resin pipe to be connected by inserting a pipe end spigot 4 of the joint 1 a synthetic resin tube hand the pipe end socket 11 of the other synthetic resin pipe 2 Since the tube end insertion port 4 is press-fitted into the tube end reception port 11 and the tube end reception port 11 and the tube end insertion port 4 are bonded, the tube end reception port 11 and the tube end insertion port 4 are in a pressure contact state. Bonded and a high bonding strength can be obtained at the connection location.

As described above, in this embodiment, the bands 22 and 22 are externally engaged and engaged with the tube end insertion port 4 side and the tube end receiving port 11 side, respectively, and the band 22 and 22 are tightened. Since the bolts 28 and the nuts 29 and 29 are tightened, the removal preventing effect can be improved by tightening using the bands 22 and 22 in addition to the pressure contact bonding.

Thus, in this embodiment, corresponding to claim 1 , the pipe end insertion port 4 of the joint 1 which is one synthetic resin pipe is inserted and connected to the pipe end reception port 11 of the other synthetic resin pipe 2. In the synthetic resin pipe connection method, the pipe end insertion opening 4 has a reduced outer peripheral portion 5 that decreases toward the tip, and an engagement step portion that is an engaging portion is provided on the outer surface of the base end side of the reduced outer peripheral portion 5. 6 is formed, a shape retaining member 7 is provided on the inner periphery of the distal end side of the tube end insertion opening 4, and a band 22 that is externally engaged and engaged with the tube end insertion opening 4 side and the tube end reception 11 opening side, 22 and bolts 28 and nuts 29 and 29, which are fastening means for fastening the two bands 22 and 22, are used to heat the pipe end receiving port 11 and to the heated tube end receiving port 11 to the tube end inserting port 4 while拡口the tube end receptacle 11 is press-fitted a reduced outer peripheral portion 5 of the, bonds the inner circumference and the reduced outer peripheral portion 5 of the tube end receptacle 11, reducing the outer peripheral portion to the pipe end socket 11 that said heating Press 5 As a result, the tube end receiving port 11 is expanded in accordance with the reduced outer peripheral portion 5, and the other band 22 is engaged with the expanded outer peripheral portion of the expanded tube end receiving port 11. Since the band 22 is engaged, the tube end receiving port 11 and the tube end insertion port 4 are bonded in a pressure contact state, and a high bonding strength can be obtained at the connection location.

As described above, in this embodiment, corresponding to claim 1 , bands 22 and 22 which are externally engaged and engaged with the tube end insertion port 4 side and the tube end receiving port 11 side, respectively, Using bolts 28 and nuts 29 and 29 as tightening means for tightening between the two, the tube end insertion port 4 is press-fitted into the heated tube end reception port 11 to expand the outer periphery of the tube end reception port 11. Since the band 22 is engaged, tightening with the band 22 can improve the retaining effect. Further, since the band 22 engages with the outer peripheral enlarged portion of the pipe end receiving port 4 expanded by press fitting, it is not necessary to provide a separate engaging portion on the outer periphery of the other synthetic resin pipe 2, and for the purpose of dimension adjustment. Even when the synthetic resin pipe 2 is cut on-site, the connection work can be easily performed using the cut end as the pipe end receiving port 11.

In this way, in this embodiment , since the reduced outer peripheral portion 5 is formed in the tube end insertion opening 4 corresponding to claim 1, it is possible to smoothly insert the heated tube end reception opening 11 while expanding it. it can. Moreover, although the force which tries to deform | transform the pipe end insertion opening 4 is added at the time of insertion, since the shape-retaining member 7 was provided, the deformation | transformation of the pipe end insertion opening 4 can be prevented.

According to the second aspect of the present invention , a belt-like bulging portion 6A is provided on the outer surface on the proximal end side of the reduced outer peripheral portion 5, and the engaging step portion 6 serving as an engaging portion on the proximal end side of the bulging portion 6A. And a step portion 6B is formed on the distal end side of the bulging portion 6A, and the tip end surface of the tube end receiving port 11 and the step portion 6B are connected so as to maintain a gap.

  4 to 5 show a second embodiment of the present invention. The same reference numerals are given to the same parts as those of the first embodiment, and detailed description thereof is omitted. In this example, the deformation of the adhesive 31 is changed. In the example, aluminum particles 32, which are substantially spherical metal particles having a diameter of about 1 to 2 mm, are mixed in the adhesive 31. The aluminum particles 32 may be mixed in the adhesive 31 in advance, or may be mixed by sprinkling the aluminum particles 32 on the adhesive 31 applied to the application surface. The aluminum particles 32 are aluminum or aluminum alloy particles.

  Therefore, after the adhesive 31 mixed with the aluminum particles 32 is applied and the tube end insertion port 4 is press-fitted into the tube end receiving port 11, the aluminum particles 32 bite into the portion dissolved by the adhesive 31 and the adhesive 31 is cured. By doing so, the tube end receiving port 11 and the tube end insertion port 4 are firmly integrated and bonded.

  FIG. 6 shows a third embodiment of the present invention. The same reference numerals are given to the same portions as those in the first embodiment, and detailed description thereof is omitted. In this example, the outer peripheral surface of the tube end insertion port 4 is shown. A groove portion 33 for preventing slipping is provided around the reduced outer peripheral portion 5 and the inner peripheral surface of the tube end receiving port 11, and a plurality of groove portions 33 are provided at substantially equal intervals in the length direction. In addition, although the cross-sectional square groove part 33 was shown in FIG. 6, shapes, such as a semicircle, can be selected suitably.

  Therefore, by applying and bonding the adhesive 31 to the reduced outer peripheral portion 5 in which the groove portion 33 is formed and the inner peripheral surface of the tube end receiving port 11, the drawing strength is improved after the adhesive 31 is cured, and Since uneven adhesion due to press-fitting is less likely to occur, more reliable adhesion can be performed.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the embodiment, the joint is illustrated as one synthetic resin pipe, but one synthetic resin pipe having the same main body as the other synthetic resin pipe and provided with the pipe end insertion port and the engaging portion at the pipe end is used. It is good also as a resin pipe. Various adhesives can be used as long as an adhesive can be obtained in accordance with the material of the synthetic resin tube. However, in Example 2, it is preferable to use a type of adhesive that melts and bonds the synthetic resin tube.

It is a partially cutaway sectional view of a connection structure showing Example 1 of the present invention. FIG. 2 is a cross-sectional view of the connection structure in the diameter direction. It is sectional drawing explaining a connection method same as the above. It is an expanded sectional view of the principal part of the connection structure which shows Example 2 of this invention. It is sectional drawing explaining an adhesion state same as the above. It is an expanded sectional view of the principal part of the connection structure which shows Example 3 of this invention.

1 Fitting (one synthetic resin pipe)
2 Synthetic resin pipe (the other synthetic resin pipe)
4 Pipe end insertion slot 6 Engagement step (engagement part)
6A bulge
6B Step
11 Pipe end receptacle
22 bands
23 Split Band
28 Tightening bolts (tightening means)
29 Nut (tightening means)
31 Adhesive

Claims (2)

In the connecting method of the synthetic resin pipe, the pipe end insertion port of one synthetic resin pipe is inserted and connected to the pipe end receiving port of the other synthetic resin pipe.
The tube end insertion opening has a reduced outer peripheral portion that reduces toward the distal end, and an engagement portion is formed on an outer surface on the proximal end side of the reduced outer peripheral portion. A shape-retaining member is provided around the circumference,
Using a band to be externally engaged and engaged with the tube end insertion side and the tube end receiving side, and a tightening means for tightening between both the bands,
The tube end receiving port is heated, the reduced outer peripheral portion of the tube end insertion port is press-fitted into the heated tube end receiving port to expand the tube end receiving port, and the inner periphery of the tube end receiving port. And the reduced outer peripheral part ,
By pressing the reduced outer peripheral portion into the heated tube end receiving port, the tube end receiving port is expanded following the reduced outer peripheral portion, and the other expanded outer peripheral portion of the expanded tube end receiving port A synthetic resin pipe connecting method , wherein the band is engaged, and one of the bands is engaged with the engaging portion . A belt-like bulging portion is provided around an outer surface on the proximal end side of the reduced outer peripheral portion, the engaging portion is formed on the proximal end side of the bulging portion, and a step portion is provided on the distal end side of the bulging portion. The synthetic resin pipe connection method according to claim 1, wherein the connection is made so as to maintain a gap between the tip end surface of the pipe end receiving port and the stepped portion.

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