JP4653589B2 - Piping connection structure and piping connection method - Google Patents

Description

The present invention relates to a pipe connection structure and a pipe connection method for a pipe member in which a penetration preventing layer for preventing penetration of a liquid such as a solvent is formed.

  Conventionally, as a pipe member buried in the ground like a water pipe, for example, a pipe member made of a resin having heat melting properties like polyolefin is used. Since such a pipe member can be fusion-bonded to other polyolefin pipe members, the water-tightness of the joint portion of both pipe members can be secured, but the gasoline contained in the soil in the ground There is a problem that the organic solvent as described above easily penetrates into the tube member. Thus, it has been proposed to form a permeation preventing layer for preventing permeation of the solvent into the outer peripheral surface of the pipe member (see, for example, Patent Document 1).

When connecting the pipe members on which the permeation preventing layer is formed, the ends of the pipe members that are in contact with each other are joined to each other. At this time, in order to prevent the solvent from entering the pipe member through the permeation preventive layer of each pipe member, the both end parts are covered from above the permeation preventive layer between the two joined end parts of the pipe member. A cover member is provided, and the cover member is fixed to each pipe member from above the respective permeation preventive layers with a non-permeable adhesive tape. Thereby, it can suppress that a solvent osmose | permeates the inside of each pipe member through the penetration prevention layer of each pipe member.
Japanese Patent Laying-Open No. 2005-127419 (page 4-5, FIG. 1)

  However, since the cover member is simply attached to each permeation preventive layer by the adhesive force of the adhesive tape without being integrated with each permeation preventive layer, for example, when each buried pipe member is moved in the ground When the frictional force generated between the cover member and the soil in the ground acts as a pulling force for pulling the cover member on the cover member, the adhesive tape peels off from each penetration preventing layer or the cover member by the pulling force. The fixing of the cover member to each permeation preventive layer is released. For this reason, the gap between the cover member and each permeation prevention layer cannot be sufficiently sealed, and a liquid such as a solvent may infiltrate into each tube member between the cover member and each permeation prevention layer. There is.

Therefore, an object of the present invention is to provide a pipe connection structure and a pipe connection method capable of reliably preventing liquid from entering the pipe member.

In order to solve the above-mentioned problems, the invention according to claim 1 is a pipe connection structure for connecting pipe members having a permeation prevention layer on the outer periphery, and the pipe members are fused via a pipe joint. The pipe joint that connects the pipe members and connects the pipe members is covered with a cover member with a play on the outer periphery, and the end of the cover member is on the outer periphery of the end of the permeation preventive layer of each pipe member. The overlapped and stacked end portions of the permeation prevention layers and the end portions of the cover member are integrated by fusion .
According to a second aspect of the present invention, in the above, the pipe member is fused integrally with the pipe joint in a state where the end portion exposed by removing the permeation prevention layer is inserted into the pipe joint. The cover member is sized so as to cover the entire pipe joint with the play.
The invention according to claim 3 is characterized in that, in the above, a protective layer for protecting the permeation preventive layer and the pipe member is formed on the permeation preventive layer.
The invention according to claim 4 is a pipe connection method for connecting pipe members each provided with a permeation prevention layer on the outer periphery, wherein the pipe members are connected by fusion via a pipe joint, and the pipe member The pipe joints that connect the two are covered with a cover member with play on the outer periphery, and the end of the cover member is overlapped with the outer periphery of the end of the permeation preventive layer of each pipe member, and each permeation prevention layered. The end of the layer and the end of the cover member are integrated by fusion.

  According to the first aspect of the present invention, both ends of the pipe members joined to each other are prevented from entering the pipe members through the permeation preventing layers of the pipe members connected to each other. The cover member, which is provided so as to cover both ends of the cover, is fused to the permeation prevention layer of each pipe member. By this fusion, the cover member and each permeation prevention layer are reliably integrated. Can be made. Thereby, for example, even when each embedded pipe member is moved in the ground, the frictional force generated between the cover member and the soil in the ground acts as a pulling force that pulls the cover member on the cover member. As compared with the conventional case where the cover member is fixed to each penetration preventing layer with an adhesive tape, it is possible to reliably suppress the peeling of the cover member from each penetration preventing layer by this pulling force.

  Therefore, since the space between the cover member and each permeation preventive layer can be more reliably sealed as compared with the conventional case, when the pipe member is embedded in the ground, the solvent contained in the soil in the ground is separated from the cover member. It is possible to reliably prevent intrusion into each pipe member through each of the permeation preventive layers.

  According to the second aspect of the present invention, the pipe members are connected to each other through the pipe joint by inserting the end portions from which the permeation preventive layer has been removed into the pipe joint, Since it is provided so as to cover the pipe joint, the permeation preventing function of the cover member can prevent liquid from entering into each pipe member through between the cover member and each permeation prevention layer. In addition, even when the pipe joint does not have a function of preventing the penetration of the liquid, it is possible to reliably prevent the liquid from penetrating into the pipe joint. Thereby, it can prevent reliably that the liquid osmose | permeates in a pipe joint, and permeates into each pipe member through this pipe joint.

  According to the invention described in claim 3, since the permeation preventive layer and the protective layer for protecting the pipe member are formed on the permeation preventive layer, the pipe member embedded in the ground is It is possible to reliably prevent damage from stones contained in the soil. Accordingly, when the pipe member is buried in the ground after the pipe member is disposed in the buried portion formed on the ground in order to embed the pipe member in the ground, the pipe member is embedded in the buried soil for burying the pipe member in the ground. And the soil excavated at the time of formation of an embedding part can be used as it is, without using the soil only for embedding which removed the stone etc. which may damage a penetration prevention layer. Thereby, the increase in construction cost by using soil only for embedding can be suppressed reliably.

  According to the fifth aspect of the present invention, the pipe members are joined to each other at the respective end portions, and the liquid enters the pipe member through the permeation preventive layer between the jointed ends of the pipe members. In order to prevent this, the cover member that covers both ends of each pipe member is arranged so as to straddle between the both ends of the pipe member, and the cover member is fused to each penetration preventing layer, thereby preventing the penetration of each cover member and each penetration member. The layers can be reliably integrated. As a result, since the space between the cover member and each permeation preventive layer is reliably sealed, it is possible to reliably prevent liquid from entering into each tube member via the cover member and each permeation preventive layer. Can do.

  The present invention will be described with reference to the illustrated embodiments.

  FIG. 1 shows an example in which a pipe connection structure 10 according to the present invention is applied to a connection structure for connecting a plurality of pipe members 12 constituting a pipe line for guiding clean water in the ground.

  In the example shown in FIG. 1, the pipe member 12 according to the present invention has a cylindrical shape, and is formed of a resin that can be easily melted by heating, such as polyolefin such as polyethylene and polypropylene.

  A permeation preventive layer 13 for preventing an organic solvent such as gasoline contained in the soil in the ground from penetrating into each pipe member 12 is provided on the outer peripheral face 12a of each pipe member 12. It is formed over. The permeation preventive layer 13 is made of a material having a lower solvent permeability than polyolefin, and in the illustrated example, is made of nylon well known in the art. The thickness of the permeation preventing layer 13 is set to 0.1 to 0.2 mm in the illustrated example.

  Further, on the outer peripheral surface 12a of each pipe member 12, in the illustrated example, a protective layer 14 for protecting each pipe member 12 embedded in the ground and the permeation prevention layer 13 from underground stones, etc. It is formed over the entire surface 12a. The protective layer 14 is made of the above-described polyolefin in the illustrated example. As the polyolefin used for the protective layer 14, for example, a molten resin produced by melting a discarded polyolefin tube can be reused.

  The penetration preventing layer 13 and the protective layer 14 can be formed on each pipe member 12 by, for example, well-known injection molding or extrusion molding.

A method for connecting the pipe members 12 to each other will be described with reference to FIGS. 2 and 3 show an example in which each pipe member 12 is connected via a pipe joint 15. Pipe joint 15, in the illustrated example, consist likewise polyolefin and each tube member 12 consists of a cylindrical member having an inside diameter substantially equal to the outer diameter of the respective tube members 12.

When connecting the tubular member 12 to each other, as shown in FIG. 2, each tube member permeation prevention layer 13 and the protective layer 14, by a dedicated cutter 16 respectively at the end 12b that had come toward one another in each tube member 12 The outer peripheral surface 12a in the edge part 12b of each pipe member 12 is each exposed by cut | disconnecting along the circumferential direction of 12 and removing. Further, the protective layer 14 formed on each tube member 12 is moved in the circumferential direction of each tube member 12 by the cutter 16 described above at a position spaced from the previously cut position in the axial direction of each tube member 12. Each penetration preventing layer 13 is partially exposed by further cutting along and removing along.

  Next, as shown in FIG. 3, the end 12 b where the outer peripheral surface 12 a of each pipe member 12 is exposed is inserted into the pipe joint 15, and the outer peripheral surface 12 a and the pipe joint 15 at the end 12 b of each pipe member 12 are inserted. For example, the end portions 12b of the pipe members 12 are joined to each other via the pipe joint 15. Thereby, the pipe members 12 are connected to each other via the pipe joint 15.

  In the pipe connection structure 10 according to the present invention, in the state where each pipe member 12 is buried in the ground, the organic solvent described above in each pipe member 12 through the penetration preventing layers 13 of the pipe members 12 connected to each other. The cover member 17 is provided for preventing the intrusion.

In the example shown in the figure, the cover member 17 has both end portions 17 a open, has a seamless sleeve shape, and is formed of nylon in the same manner as the permeation prevention layer 13. The cover member 17 has a size for receiving the pipe joint 15 with play in the inside thereof, and has an axial length dimension of at least the penetration preventing layers 13 of the two pipe members 12 connected to each other via the pipe joint 15. The size is set to cover the exposed part.

  When using the cover member 17, before connecting the pipe members 12 to each other, the cover member 17 is fitted from the outside to the pipe members 12 to be connected. The cover member 17 is moved along the pipe member 12 so that the pipe joint 15 is wrapped around the pipe member 15. As shown in FIG. 3, both end portions 17 a of the cover member 17 are exposed portions of the permeation preventive layers 13 of both pipe members 12. The cover member 17 is straddled between the permeation preventing layers 13 so as to cover the surface. Thereafter, both end portions 17 a of the cover member 17 are fused to each penetration preventing layer 13. Thereby, the cover member 17 is fixed to each pipe member 12 via each penetration preventing layer 13.

  For fusing the cover member 17 to each permeation preventive layer 13, a fusing device 18 as shown in FIG. 4 is used.

  In the illustrated example, the fusing device 18 is provided with a pair of semi-cylindrical members 19 and an inner peripheral surface 19 a of each semi-cylindrical member along the circumferential direction of each semi-cylindrical member 19. And a heating wire 20 for melting each of the prevention layers 13.

  Each semi-cylindrical member 19 has an inner diameter substantially equal to the outer diameter of each tube member 12. The length dimensions along the axis of each semi-cylindrical member 19 are set to be equal to each other and at least equal to the width dimension of the exposed portion of the permeation preventive layer 13 formed on each tube member 12. Each semi-cylindrical member 19 is disposed so that the inner peripheral surfaces 19a face each other so as to form a cylinder in cooperation with each other, and each semi-cylindrical member 19 is disposed between one end portion 19b among the opposite end portions. They are pivotably connected to each other via a pivot (not shown) provided along the axial direction.

  The heating wire 20 is made of a metal wire made of nickel chrome, for example, and a cable 21 for supplying power to the heating wire is connected to the heating wire 20. As is well known in the art, the heating wire 20 generates heat when electric power is supplied through the cable 21.

  At the time of fusing the cover member 17 to each permeation preventive layer 13, as shown in FIG. 3, from the end 17a of the cover member 17 covering the exposed portion of the permeation preventive layer 13 formed on each pipe member 12, Each semi-cylindrical member 19 is disposed so as to sandwich each tube member 12. In this state, when the heating wire 20 is energized, the end 17a of the cover member 17 and the permeation prevention layers 13 are melted. Thereby, the cover member 17 and each penetration prevention layer 13 are integrated with each other. Thereafter, the end portion 17a of the cover member 17 and the melted portion of each penetration preventing layer 13 are solidified, whereby the end portion 17a of the cover member 17 and each penetration preventing layer 13 are fused to each other.

  In this way, both ends 12b of the pipe members are covered with each other so as to prevent the solvent from entering the pipe members 12 through the penetration preventing layers 13 of the pipe members 12 connected to each other. Since the cover member 17 provided so as to straddle between the portions is fused to the permeation preventing layer 13 of each tube member 12, the permeation formed in the cover member 17 and each tube member 12 by this fusion. The prevention layer 13 can be reliably integrated.

  Thereby, when each buried pipe member 12 is moved in the ground, for example, the frictional force generated between the cover member 17 and the soil in the ground acts on the cover member 17 as a pulling force for pulling the cover member. Even when the cover member 17 is fixed to the permeation preventive layer 13 formed on each tube member 12 with an adhesive tape (not shown) as in the prior art, the pulling force causes the cover member 17 to move to each permeation preventive layer 13. It is possible to reliably prevent peeling from the film.

  Therefore, since the space between the cover member 17 and each permeation preventive layer 13 can be more reliably sealed as compared with the conventional case, when each pipe member 12 is buried in the ground, the solvent is in contact with the cover member 17 and each permeation. Intrusion into each pipe member 12 through the space between the prevention layers 13 can be reliably prevented.

Further, as described above, the tubular member 12 are connected to each other via a tube joint 15 by an end portion 12b respectively permeation preventing layer 13 has been removed is inserted into the pipe joint 15, the cover member 17 is provided so as to cover the pipe joint 15, the solvent permeates into each pipe member 12 through the space between the cover member 17 and each penetration prevention layer 13 by the penetration prevention function of the cover member 17. In addition to being able to prevent this, even when the pipe joint 15 does not have a function of preventing the penetration of the solvent, the penetration of the solvent into the pipe joint 15 can be reliably prevented. Thereby, it can prevent reliably that a solvent osmose | permeates in the pipe joint 15 and permeates into each pipe member 12 through this pipe joint.

Furthermore, as described above, the protective layer 14 for protecting the permeation preventive layer 13 and the pipe member 12 is formed on the permeation preventive layer 13 .

Conventionally, when each pipe member 12 on which the protective layer 14 is not formed is arranged in a buried portion (not shown) formed on the ground, when the pipe member is buried in the ground, each pipe member is buried in the ground. If the soil excavated at the time of formation of the buried portion is used as it is, the pipe member will be damaged by stones contained in the underground soil, so that the pipe member 12 and the permeation prevention layer 13 are damaged. Soil dedicated to burial from which stones that may be applied are removed is used, but this increases construction costs.

On the other hand, according to the present embodiment, as described above, the protective layer 14 for protecting the penetration preventing layer 13 and the pipe member 12 is formed on the penetration preventing layer 13. It is possible to reliably prevent the pipe member 12 embedded therein from being damaged by stones or the like contained in the soil in the ground. Thereby, when each pipe member 12 arranged in the buried portion is buried in the ground, the buried portion for embedding each pipe member 12 in the ground is not used for the buried portion described above. The soil excavated at the time of formation can be used as it is. Thereby, the increase in construction cost by using soil only for embedding can be suppressed reliably.

  Further, as described above, when the cover member 17 is fused to each permeation preventive layer 13, each of the semi-cylindrical members 19 disposed so as to sandwich the respective tube members 12 on the permeation preventive layer 13 from above the cover member 17. By energizing the heating wire 20, the cover member 17 and the permeation prevention layers 13 can be easily fused together.

  In the present embodiment, an example in which the pipe members 12 are connected to each other via the pipe joint 15 is shown. Instead, each pipe member 12 is a so-called bat in which end faces of the end portions 12b are fused to each other. The present invention can be applied to connection structures that are connected to each other by fusion bonding.

  In this case, the end 12b where the outer peripheral surface 12a of each tube member 12 is exposed is fused to each other, and the cover member 17 is disposed so as to straddle between the permeation prevention layers 13 where each tube member 12 is exposed. Each penetration preventing layer 13 can be fused by a fusion device 18.

  In the present embodiment, the cover member 17 has a seamless sleeve shape. However, instead of this, a sheet-like cover member can be applied to the present invention. In this case, a sheet-like cover member is wound around the two pipe members 12 so as to straddle between the end portions 12b of the pipe members 12 joined to each other from above the exposed both permeation preventing layers 13 of the two pipe members 12. Both end portions of the member can be fused to each penetration preventing layer 13.

  Further, in this embodiment, the cover member 17 is made of nylon. However, instead of this, the cover member 17 is formed of a material other than nylon as long as the material has a function of preventing penetration of the solvent. be able to.

  Further, in this embodiment, an example in which the present invention is applied to a connection structure that connects a plurality of pipe members 12 that constitute a pipe line for guiding clean water in the ground is shown, but instead, For example, the present invention can be applied to a connection structure that connects a plurality of pipe members that constitute a pipe line for guiding gas in the ground.

It is a transverse cross section showing the pipe member concerning the present invention roughly. It is a perspective view showing roughly the state where a penetration prevention layer and protective layer which were formed in the pipe member concerning the present invention were partially cut off. It is a longitudinal section showing roughly the connection state of the pipe member concerning the present invention. 1 is a perspective view schematically showing a fusion apparatus according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe connection structure 12 Pipe member 12a Outer peripheral surface 12b End part 13 Penetration prevention layer 14 Protective layer 15 Pipe joint 17 Cover member 18 Fusion apparatus 19 Semi-cylindrical member 19a Inner peripheral surface 20 Heating wire

Claims (4)

A pipe connection structure for connecting pipe members provided with a permeation prevention layer on the outer periphery,
The pipe members are connected by fusion through a pipe joint,
The pipe joint connecting the pipe members is covered with a cover on the outer periphery by a cover member,
The end portion of the cover member is overlapped with the outer periphery of the end portion of the permeation prevention layer of each pipe member,
A pipe connection structure, wherein an end of each of the permeation prevention layers and an end of the cover member are integrated by fusion . The pipe member is indirectly connected by the end part exposed by removing the permeation preventive layer being fused integrally with the pipe joint while being inserted into the pipe joint,
The pipe connection structure according to claim 1, wherein the cover member is sized to cover the entire pipe joint with the play .   The pipe connection structure according to claim 1, wherein a protection layer for protecting the permeation prevention layer and the pipe member is formed on the permeation prevention layer. A pipe connection method for connecting pipe members provided with a permeation prevention layer on the outer periphery,
The pipe members are connected by fusion through a pipe joint,
The pipe joint connecting the pipe members is covered with a cover member with a play on the outer periphery,
The end of the cover member is overlapped with the outer periphery of the end of the permeation prevention layer of each pipe member,
A pipe connecting method, wherein the end portions of the respective permeation prevention layers and the end portions of the cover member are integrated by fusion .

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