JP3393273B2 - Inner / outer surface smooth synthetic resin tube and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a pipe used as a ventilation pipe for air conditioning and other various fluid transportation pipes, a wire protection pipe, a pipe for repair and rehabilitation of an old pipe, and the like, and the inner wall and outer wall of the pipe are substantially The present invention relates to a smooth synthetic resin pipe having inner and outer surfaces formed in a smooth cylindrical shape.

[0002]

2. Description of the Related Art Conventionally, various types of smooth inner and outer surface synthetic resin tubes have been proposed, some of which have already been manufactured and are generally known. On the other hand, as shown in FIG. 8, a belt-shaped synthetic resin profile A having an arrow-shaped cross section is formed, and adjacent protrusions a are sequentially inserted into the openings b while being spirally wound. It is also known to form a tubular body P by doing so.

The former smooth inner and outer surface synthetic resin pipe is a pipe produced by a factory, and the pipe diameter is determined at the time of factory production. The latter tubular body B can of course be manufactured in a factory, but since it is a tube that is connected and formed using the profile A, the profile A is transported to the site of use,
As described above, the adjacent projections a are sequentially inserted into the openings b while being spirally wound, so that a tubular body having an arbitrary diameter can be formed. For this reason, it has come to be used as an air-conditioning duct for which strict sealing and pressure resistance are low, a rehabilitation pipe for repairing old pipes, and the like.

However, the pipe body P formed by using the profile A has flexibility by forming the projection a in the fitting space c so as to be freely slidable in the axial direction of the pipe. Since it is designed to be held, as described above, it does not have hermeticity and has poor resistance to pressure deformation. Therefore, the range of use is extremely limited,
It has a problem that it cannot be used in a portion where airtightness is generally required like a general tubular body.

[0005]

An object of the present invention is to transport a profile to a site of use to form a tubular body having an arbitrary diameter, as in the case of the tubular body P formed using the profile A described above. Although it is a tube body that can utilize the advantage of being capable of being manufactured, it is a tube having sufficient pressure resistance flatness performance in comparison with the tube body P formed of the profile A, and can only be manufactured in a factory. As in the case of a general pipe, it is a pipe body having sufficient airtightness, and the inner wall and the outer wall are in a substantially smooth cylindrical shape, and a spiral reinforcing wall extending in the radial direction is provided between these both walls. The present invention aims to provide a synthetic resin tube having smooth inner and outer surfaces.

[0006]

The construction of the smooth inner and outer surface synthetic resin pipe according to the present invention, which was devised to solve this problem, is as follows.
The cross-sectional shape is a hollow rectangular shape, and the opening 1 is formed in the vertical wall 11 on one side.
2, a strip-shaped synthetic resin profile 10 having a projecting wall 14 projecting laterally outward from a vertical wall 13 on the other side.
Is spirally wound, the protruding wall 14 of the succeeding winding profile 10 is inserted into the opening 12 of the preceding winding profile 10, and the abutment surface 20 between the opening 12 and the protruding wall 14 is The inner wall 2 and the outer wall 3 are bonded together by an adhesive 5 so as to be integrally and watertightly connected to each other, and the inner wall 2 and the outer wall 3 have a substantially smooth cylindrical shape, and a spiral connecting wall 4 extending in the radial direction is formed between the both walls. It has been configured.

Further, in the method of manufacturing a tubular body having such a structure, the strip-shaped profile forming the tubular wall 1 has a hollow rectangular cross section, and the opening 12 is formed in the vertical wall 11 on one side. To form a synthetic resin profile 10 in which a projecting wall 14 projecting laterally outward is formed on a vertical wall 13 on the other side. One of the opening 12 of the profile 10 or the projecting wall 14 or Adhesive 5 is applied to both sides, and the spiral winding is sequentially performed while inserting the protruding wall 14 of the subsequent winding profile 10 into the opening 12 of the preceding winding profile 10.
The adhesive 5 is cured and the pre-wound profile 10
This is a method of connecting the following winding profile 10 in a watertight and integrated manner.

The tube wall 1 of the smooth inner and outer surface synthetic resin tube according to the present invention is not limited to a single layer, but may be formed in a multi-layered structure such as a two-layered or three-layered structure. .
The profile 10 forming the pipe wall 1 is a rectangular strip having a hollow cross section having an arbitrary width, height and wall thickness in consideration of the pipe diameter and pressure resistance, and its forming material is polyethylene or polyvinyl chloride. -Select and use polypropylene and other synthetic resin materials. The profile 10 forming the tube wall 1 is not limited to a simple rectangular shape, but as another means for improving the pressure resistance, the hollow portion 17 is provided with the left and right vertical walls 1.
You may implement it as what has formed the reinforcement vertical wall 18 different from 1 and 13.

[0009]

The inner and outer surface smooth synthetic resin pipe of the present invention having the above-described structure, when a large pressure acts on the pipe wall 1, the outer wall of the pipe, the connecting wall 4 and the inner wall 3 cooperate to counteract the external pressure. , Works to prevent flattening of pipes.

[0010]

Embodiments of the present invention will now be described with reference to the accompanying drawings. 1 and 2 are views showing a first embodiment of the present invention. Figure 1 shows a smooth inner and outer surface synthetic resin pipe P
FIG. 2 is a view showing an outer shape and a manufacturing process in which a part of is broken, and FIG. 2 is an enlarged sectional view showing a structure of a pipe wall 1 portion.

First, for convenience of explanation, the manufacturing method will be described. Two left and right vertical walls 11 and 13 and upper and lower horizontal walls 15 and 1.
6 has a substantially square cross section with a hollow portion 17, has an opening 12 at the lower end of a vertical wall 11 on one side (right side in the figure), and has a vertical wall 13 on the other side (left side in the figure). A strip-shaped synthetic resin profile 10 having a projecting wall 14 projecting outward in the left lateral direction from a portion near the lower end of is extruded from a synthetic resin extruder to be formed. The synthetic resin material is
Any material may be used as described above. This profile 10
Is transported in the factory or to the place where the pipe is installed and wound in a spiral shape. Prior to this winding, the adhesive 5 is applied to the upper surface of the projecting wall 14 on both upper and lower sides, if necessary, and the projecting wall 14 of the succeeding winding profile 10 is inserted into the opening 12 of the preceding winding profile 10. The contact surfaces 20 of these two parts 12 and 14 are adhered by an adhesive 5 and cured to be integrally and watertightly connected.

As shown in FIGS. 1 and 2, the structure of the smooth inner and outer surface synthetic resin pipe P manufactured as described above is as follows.
The tube wall 1 has an inner wall 2 formed into a substantially straight cylindrical shape,
Similarly, an outer wall 3 formed in a substantially straight cylindrical shape and a connecting wall 4 connecting the inner and outer walls 2, 3 are spirally extending in a radial direction, and adjacent profiles 10 are adjacent to each other. The tubular structure is integrally connected at the contact surface 20 between the opening 12 and the protruding wall 14 and has the hollow chamber 6 inside.

As means for connecting the adjacent profiles 10, the adhesive 5 may be applied to one or both sides of the projecting wall 14 of the profile 10, or the adhesive 5 may be applied to the opening 12 of the profile 10. The adhesive 5 may be applied, or both may be applied. The adhesive 5 is not limited to a solvent-based adhesive and may be a molten resin. Further, instead of applying the adhesive agent, the adhesive surface can be adhered by a method of heating and melting the adhesive surface and fusing. As described above, the adhesive surface is the contact surface 20 between the opening 12 and the protruding wall 14.
If left alone, the entire pipe body P can be made somewhat flexible. However, in the case of a pipe body which is not required to have flexibility, not only the contact surface 20 but also a part or the whole of the vertical walls 11 and 13 of the adjacent profile 10 may be bonded.

The pressure resistance flatness test and the airtightness test were carried out on the 10 tubes having the structure shown in FIGS. The results were as follows. The length of the pipe P is 1 m,
Synthetic resin material = Hard vinyl chloride, Adhesive type = Solvent-based adhesive, Pipe outer diameter 338 mm, Inner diameter 300 mm, Wall thickness of four sides of profile 10 3.0 mm (Thickness of inner and outer walls 2, 3 3 0.0mm, the wall thickness of the connecting wall 4 is 6.0mm)
As a result of applying a load of 0 kg / m, there is no load (round condition)
The average amount of deformation (sink amount) was 7.1 mm. In addition, in a test in which a water pressure of ² kg / cm ² was applied to the pipe for 30 minutes, no water leakage phenomenon to the outside was observed. Therefore, it was confirmed that even if the pipe P is buried in the ground and used, it can withstand the external pressure and can also withstand the water pressure.

Next, the structure of the pipe body in which the pressure resistance flatness and airtightness of the pipe P are further improved will be described for the inner and outer smooth synthetic resin pipe P of the second embodiment shown in FIG. The pipe is an example relating to a multi-layer pipe wall formed by overlapping the pipe wall 1 shown in the first embodiment in a double manner. In the pipe P of the embodiment, the profile 10 is superposed in the same manner as described in the first embodiment while applying the adhesive 5 on the outer peripheral surface of the pipe wall 1 shown in the first embodiment. While sequentially joining,
The outer layer tube wall 1A of the other layer is formed on the tube wall 1 of the first layer to form an integrated double layer tube P. Of course,
It is needless to say that the structure is not limited to the double-layer structure, and can be implemented as a triple-layer structure or a multilayer structure having more layers, if necessary. Adhesion between the tube wall 1 of the first layer and the tube wall 1A of the outer layer is performed by applying an adhesive 5 to the outer peripheral surface of the first layer forming profile 10 or the inner peripheral surface of the second layer forming profile 10. You can also The pipe P of the embodiment is formed such that the outer layer pipe wall 1A overlaps the seam of the profile 10 of the first layer pipe wall 1.

The inner and outer surface smooth synthetic resin pipes P of the third and fourth embodiments shown in FIGS. 4 and 5 are pipes having a single layer of pipe wall like the pipe P shown in the first embodiment. Therefore, it is an embodiment of a tube structure capable of further enhancing the pressure resistance flatness performance. The difference is that the profile 10 forming the tube wall 1 has a shape in which, in addition to the left and right vertical walls 11 and 13, another reinforcing vertical wall 18 that connects the upper and lower horizontal walls 15 and 16 is formed. It is what In the embodiment shown in FIG. 4, one reinforcing vertical wall 18 is formed, and in the embodiment shown in FIG. 5, two reinforcing vertical walls 18 are formed. A tube P formed by using the profile 10 as described above.
Is the structure of the tube wall 1 between the two connecting walls 4 and 4 formed by abutting or adhering the profile 10
A tubular body having another reinforcing vertical wall 18 connecting the inner wall 2 and the outer wall 3 is obtained.

The inner / outer surface smooth synthetic resin pipe P of the fifth embodiment shown in FIG. 6 shows another pipe structure, in which the profile 10 is formed into the left and right vertical walls 11 and 13. The upper and lower horizontal walls 15 and 16 are completely connected to each other, and the hollow chamber 6 is formed inside, and a part of the vertical wall 11 on one side is recessed in the inner depth to fit with the protruding wall 14. Recessed opening 1
It has a shape having 2. The pipe P formed by using the profile 10 thus obtained is a pipe body having the hollow chamber 6 formed in the profile 10 inside the pipe wall 1 as it is.

In the profile 10, the thickness of the lower horizontal wall 16 is made thicker than the thickness of the upper horizontal wall 15 and the left and right vertical walls 11, 13. As described above, the wall thickness of each wall of the profile 10 does not need to be formed to be uniform, and can be partially formed to be thick or thin.

The inner and outer surface smooth synthetic resin pipe P of the sixth embodiment shown in FIG. 7 is the profile 10 having the substantially square cross section shown in the first embodiment.
The formation positions of the opening 12 and the protruding wall 14 formed in the above are formed in the intermediate positions in the vertical direction of the respective walls. Profile file 10
The pipe P formed by using is a pipe body in which the profile 10 is connected at an intermediate position between the inner and outer walls 2 and 3 of the pipe wall 1. In this embodiment, the adhesive 5 is applied to the protruding wall 14
The vertical wall 11 and the protruding wall 14 which are applied to both inner and outer surfaces of the opening 12 and have the openings 12 are adhered and connected to the upper and lower surfaces of the opening 12.

The resin material and hardness of the profile 10 forming the tube wall 1 according to the present invention can be arbitrarily selected and used according to the type of pipe to be manufactured and the purpose of use. If necessary, the left and right vertical walls 11, 13 of the profile 10 may be made of a material having excellent pressure-resistant flat strength or a material having hardness, or, for example, a lower horizontal wall 16 constituting the inner wall 2 of the pipe. Depending on the type and properties of the substance that flows through the pipe, the resin material of the part is selected as a material having excellent wear resistance or a material having excellent chemical resistance, and the upper horizontal wall 15 part forming the outer wall 3 of the pipe is selected. The tubular body may be formed by forming the profile 10 by using two or more kinds of resin materials such as the above resin material having excellent water resistance and weather resistance.

Although a representative embodiment of the present invention has been described above, the present invention is not necessarily limited to the structure of the embodiment described above. For example, two wires having the same shape or different shapes can be used. Within the range of having the above-mentioned constitutional requirements of the present invention, such as obtaining a tube wound in a double pitch shape by using the profile of the above, and achieving the object of the present invention and having the following effects. It can be appropriately modified and implemented.

[0022]

As is apparent from the above description, the present invention has a profile of a tube wall having a hollow rectangular cross-section with an opening on one vertical wall and the other side. While forming a shape in which a protruding wall that protrudes laterally outward is formed on the vertical wall of, the adhesive is applied to one or both of these openings and the protruding wall, and the subsequent protruding wall is inserted into the opening. By sequentially spirally winding and curing the adhesive to connect, the contact surfaces of these openings and the projecting wall are bonded and integrally watertightly connected, and the inner wall and the outer wall are substantially smooth cylinders. Since it has a spiral connecting wall extending in the radial direction between these two walls, even in the case of a tubular body made only of a synthetic resin material, the connecting pipe extending in the radial direction. A wall made of smooth synthetic resin pipe with excellent flatness and pressure tightness It is possible. Further, in forming a pipe, it is possible to efficiently produce a pipe body having an arbitrary diameter even in a place other than a factory without requiring a sophisticated and complicated technique. Is what you can expect.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a pipe according to a first embodiment.

FIG. 2 is a sectional view of a pipe wall portion of the pipe.

FIG. 3 is a sectional view of a pipe wall portion showing a second embodiment.

FIG. 4 is a sectional view of a pipe wall portion showing a third embodiment.

FIG. 5 is a sectional view of a pipe wall portion showing a fourth embodiment.

FIG. 6 is a sectional view of a pipe wall portion showing a fifth embodiment.

FIG. 7 is a sectional view of a pipe wall portion showing a sixth embodiment.

FIG. 8 is a sectional view of a tube wall portion showing a conventional example.

[Explanation of symbols]

1 pipe wall 2 inner wall 3 outer wall 4 connecting walls 5 adhesive 10 Profile 11 Vertical wall on one side 12 openings 13 Vertical wall on the other side 14 protruding wall 20 for the time being 1A Outer layer wall

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI // B29L 22:00 B29L 22:00 23:00 23:00 (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29D 23/00 B29C 53/08 B29C 53/36 B29C 53/58 F16L 9/12

Claims (4)

(57) [Claims] 1. A vertical wall having a hollow cross section and one side.
A strip-shaped synthetic resin profile (10) having an opening (12) in (11) and a protruding wall (14) protruding laterally outward from the vertical wall (13) on the other side is spirally formed. The projecting wall (14) of the succeeding winding profile (10) is inserted into the opening (12) of the preceding winding profile (10) and these openings (12) and the projecting wall (10) are wound. The contact surface (20) with 14) is bonded by an adhesive (5) and is integrally and watertightly connected, and the inner wall (2) and the outer wall (3) have a substantially smooth cylindrical shape. A smooth inner and outer surface synthetic resin pipe in which spiral connecting walls (4) extending in the radial direction are formed between the walls. 2. The smooth inner and outer surface synthetic resin pipe according to claim 1, wherein another pipe wall (1A) is integrally formed on the pipe wall (1) in a multi-layered manner. 3. The inner wall and the outer wall (2), (3) whose cylindrical wall (1) is cylindrical
And a connecting wall (4) connecting between these two walls (2) and (3), wherein a strip-shaped profile forming the pipe wall (1) is cross-sectioned. It has a hollow rectangular shape with an opening (12) formed in the vertical wall (11) on one side and a protruding wall (14) protruding laterally outward on the vertical wall (13) on the other side. The synthetic resin profile (10) is provided, and the adhesive (5) is applied to one or both of the opening (12) and the protruding wall (14) of the profile (10), and the preceding winding profile is used. (10) opening
While inserting the protruding wall (14) of the succeeding winding profile (10) into the (12), the spiral winding is sequentially performed, the adhesive (5) is cured, and the preceding winding profile (10) and the subsequent winding Winding profile
(10) A method for producing a synthetic resin pipe having smooth inner and outer surfaces, which is water-tightly and integrally connected to (10). 4. An adhesive (5) is provided on the outer peripheral surface of the pipe wall (1) of the smooth inner and outer surface synthetic resin pipe according to claim 3, or on the inner peripheral surface side of another synthetic resin profile (10). ) Is applied, and the profile (10) is spirally wound to form the outer wall (1A) of the outer wall, and the inner wall and the outer surface are integrally bonded to the wall (1) to form a multi-layered tube. Method for manufacturing smooth synthetic resin pipe.