JPH0762508B2 - Spiral tube manufacturing method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

 The present invention relates to a method for manufacturing a spiral tube.

[Prior art]

Large-diameter pipes used in civil engineering work require a pipe-making machine to be installed at the construction site to transport the products manufactured at the factory to the construction site. A technique is known in which the long strips are successively fed and spirally wound to produce a pipe. And this prior art is also applied to the technology of lining the inner surface of the existing pipe in the state of the buried windshield for the rehabilitation of the existing pipe that has deteriorated such as water supply and sewerage.
-48690 publication.

[Problems to be Solved by the Invention]

Since a large-diameter pipe is usually required to have high rigidity capable of withstanding an external force, even in the conventional art described in the above publication, a high-rigidity synthetic resin originally using the hot pipe manufacturing method. It is preferable to supply the strip-shaped body, but since the equipment itself becomes large-scale, the cold pipe manufacturing method is adopted. However, a large force is required to bend a highly rigid synthetic resin strip cold, and as the radius of curvature becomes smaller or the wall thickness becomes larger, the bending stress cannot be endured and cracks occur. There is a problem that a pipe cannot be manufactured, and the diameter, thickness, and material of the pipe to be manufactured are limited by themselves, and a spiral pipe having a desired high rigidity cannot be obtained.

[Means for solving problems]

The present invention has been made in order to solve the above-mentioned problems of the prior art, and has a plurality of protrusions having a joint portion provided on both side edge portions and a flange portion on one side thereof in the longitudinal direction thereof. The synthetic resin strips arranged side by side are fed to a pipe making machine, and while one side of the book is wound in a spiral shape, the joining portion is joined to form a spiral pipe, and then long reinforcement is performed. A gist of the method is a method of manufacturing a spiral tube, which is characterized in that a material is continuously inserted between the protrusions and locked to the rear surface of the protruding collar portion. The joining in the present invention is not particularly limited, and, for example, the adjacent side portions of the spirally wound band-shaped body may be fitted to one side edge portion in advance by a fitting convex portion or a fitting portion. Suitable for joining by fitting a joint portion provided with a mating concave portion and a fitting concave portion or a fitting convex portion capable of fitting with the fitting convex portion or the fitting concave portion on the other side edge portion by fitting. Water-tight bonding by a method. In the present invention, as the reinforcing material, a long body having elasticity such as aluminum, metal such as iron or synthetic resin can be used, and the shape thereof is a few in the examples described later, Narrow plate-shaped body, rod-shaped body, tubular body, substantially tubular body provided with longitudinal cut grooves for sandwiching the ridges, or ridges that can be fitted in the gaps between the ridges are arranged side by side. It may be a plate body. The reinforcing material is formed by joining the synthetic resin strips at the joints to form a spiral tube, and then continuously inserting the strips into the gaps between the ridges to form a back surface of the ridge of the ridges. Depending on the strength required by the spiral tube, the number of reinforcing materials wound between the ridges can be adjusted, and the strength can be changed by selecting the material and type. You can

[Action]

The method for manufacturing a spiral tube of the present invention is a synthetic resin strip, in which a joint is provided on both side edges, and a plurality of ridges having a flange on one side are arranged in parallel in the longitudinal direction. After being supplied to a pipe manufacturing machine and spirally wound with the one surface facing outward, the joining portion is joined to form a spiral pipe, and then a long reinforcing material is continuously fitted and inserted between the protrusions. Since it is locked to the rear surface of the flange of the ridge, even if the rigidity of the spiral tube is insufficient, the insufficient rigidity is reinforced by winding the reinforcing material. It is possible to manufacture numerous grades of spiral tubing from the body for various uses. Further, in the method for manufacturing a spiral tube of the present invention, after forming the spiral tube by joining the produced resin strip at the joining portion, the spiral tube is continuously inserted into the gap between the protrusions, Since it is locked on the rear surface of the flange of the ridge, the reinforcing material can be inserted with a slight force, the reinforcing material is guided by the ridge and is evenly wound, and it is easy for conventional pipe making machines. It has the advantage that it can be diverted by simply attaching various accessory devices, and that the equipment cost is low.

【Example】

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an example of a spiral tube obtained by the method for manufacturing a spiral tube of the present invention, wherein 1 is a synthetic resin strip, which is extruded from hard polyvinyl chloride. On the upper surface of the elongated body, a plurality of T-shaped protrusions 11 each having a flange portion 12 at the tip are integrally juxtaposed in the longitudinal direction, and fitting recesses 13 and fitting protrusions that can be fitted to each other are formed on both side edges. The portion 14 is provided, and the spirally wound tube 6 is formed by fitting the fitting convex portion 14 into the fitting concave portion 13 while spirally winding. Then, every other space is provided between the protrusions 11, the reinforcing member 2 made of a thin aluminum thin plate material is provided, and both side edges of the reinforcing member 2 of the protrusion 11 of the spiral tube 6 are provided.
It has a structure in which it is bent and fitted in an arc shape in the width direction so as to be locked to the back surface of. FIG. 3 shows another example of the spiral tube obtained by the method for manufacturing the spiral tube of the present invention, and shows the relationship between the synthetic resin strip used for the spiral tube and the reinforcing material arranged between the ridges thereof. Only, and an aluminum rod-shaped body having a circular cross-section every other space in the gap between the T-shaped protrusions 11 on the upper surface of the synthetic resin strip 1 made of a long body extruded from hard polyvinyl chloride. It shows a state in which the reinforcing member 2 made of is inserted. FIG. 4 shows another example of the spiral tube obtained by the method for manufacturing a spiral tube of the present invention, and shows only the relationship between the synthetic resin strip and the reinforcing material as in FIG. , A synthetic resin made of a long body extruded from hard polyvinyl chloride, and a T-shaped ridge 11 on the upper surface of the strip-shaped body 1 and a ridge 21 having an arrow-shaped cross section on one side of the synthetic resin. It shows a state in which the above-mentioned ridge 21 having an arrow-shaped cross section of the reinforcing member 2 made of a long plate-like body is fitted and locked. FIG. 5 shows another example of the spiral tube obtained by the method for manufacturing a spiral tube of the present invention, and shows the relationship between the synthetic resin strip and the reinforcing material as in FIGS. 3 and 4. The figure shows only the long line that allows the protrusion 11 to be sandwiched between the protrusions 11 having a substantially spade-shaped collar edge on the upper surface of the synthetic resin strip 1 made of a long body extruded from hard polyvinyl chloride. Reinforcing member 2 consisting of a substantially tubular body having leg portions 22 provided with directional grooves
Shows the state of being worn. FIG. 6 and FIG. 7 are schematic explanatory views for explaining the method for manufacturing the spiral tube of the present invention, in which the synthetic resin strip 1 has a feed roll 31 and a plurality of pipe making rolls 32. 7 and the fitting uneven portions 13 and 14 of the synthetic resin strip 1 are connected and delivered to form the spiral tube 6, and then the reinforcing material 2 is provided between the projections 11 on the outer surface of the tube. The winding roll 4 paired with the pressing roll 5 shows a state in which the winding roll 4 is continuously wound.

【The invention's effect】

Since the spiral tube manufacturing method of the present invention is configured as described above, even if the rigidity of the spiral tube is insufficient, the insufficient rigidity can be reinforced by winding the reinforcing material. It is possible to manufacture a large number of grades of spiral tubing for various applications from strips. Further, in the method for manufacturing a spiral tube of the present invention, the synthetic resin strip is joined at the joining portion to form a spiral tube, and then the spiral tube is continuously inserted into the gap between the protrusions, Since it is locked on the rear surface of the flange of the ridge, the reinforcing material can be inserted with a slight force, the reinforcing material is guided by the ridge and is evenly wound, and it is easy for conventional pipe making machines. It has the advantage that it can be diverted by simply attaching various accessory devices, and that the equipment cost is low.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a spiral tube obtained by the method for manufacturing a spiral tube of the present invention, and FIG. 2 is FIG.
A sectional view taken along the line II-II, and FIGS. 3 to 5 are sectional views showing another example of the relationship between the synthetic resin strip and the reinforcing member shown in FIG. 2, and FIG. FIG. 7 is a schematic explanatory view showing an embodiment of the method for manufacturing the spiral tube of the present invention, and FIG. 7 is a schematic explanatory view seen from the tube axis direction in FIG.

[Explanation of symbols]

 1 …… Synthetic resin strip 11 …… Ribs 12 …… Brim 13 …… Mating recess 14 …… Mating recess 2 …… Reinforcing material 31 …… Feed roll 32 …… Pipe-making roll 4 …… Winding roll 5 …… Presser roll 6 …… Spiral tube

Claims (1)

[Claims] 1. A synthetic resin strip-shaped body having joints provided on both side edges and a plurality of ridges each having a flange on one side thereof arranged in parallel in a longitudinal direction thereof is supplied to a pipe making machine. Then, while spirally winding with one side facing outward, the joining portion is joined to form a spiral tube, and then a long reinforcing material is continuously inserted between the protrusions to form the protrusion. A method for manufacturing a spiral tube, wherein the spiral tube is locked to the back surface of the collar part.