JPH0419120A - Manufacture of laminated spiral pipe - Google Patents

Abstract

PURPOSE:To obtain a laminated spiral pipe which is hard to rust, has high strength and is provided with high-deformation function, by a method wherein a plurality of strips are inserted between an inner and outer roller so that the plurality of the strips become laminated state partly, the laminated parts of the strips are fused thermally to each other and molded spirally. CONSTITUTION:A plurality of sets of inner rollers 27 and outer rollers 28 are arranged so that they meet obliquely with a pipe axis of an object pipe 10 of manufacture and run respectively along an inner and outer wall of the object pipe 10 of manufacture. Strips 11, 12 are sent into toward a pair of pressure- contacting/feed rollers by the first and second pinch roller devices 21, 22 so that they become a laminated state partly. They are heated by a hot air blow- off device 34 by inserting between an inner roller 27 and outer roller 28, a coating material 14 of the inner layer side strip 11 and outer layer side strip 12 is melted and mutual laminated parts are fused thermally. When the same is sent into a pair of molding roller 30, the same is pinched and pressed between the inner roller 27 and outer roller 28, molded spirally and a long-sized spiral pipe 10 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a laminated spiral pipe suitable for use in various fluid transport line pipes, ducts, chimneys, shafts, etc.

[Prior Art] Conventionally, a laminated spiral tube as described in Japanese Patent Publication No. 58-29216 has been proposed. The 111-layer spiral tube is constructed by winding a plurality of strips in a spiral shape, stacking them on each other so as to cover the edge joints of the inner strips with the outer strips, and bonding them together.

At this time, a steel plate, a synthetic resin plate, or the like is used as the strip constituting the conventional laminated spiral pipe.

[Problem to be solved by the invention] However, although a laminated spiral pipe using strips made of steel plates has high strength and high deformability and is resistant to dynamic external forces such as earthquakes, it has the problem of being susceptible to rust. be.

Furthermore, although a laminated spiral tube using strips made of synthetic resin plates is resistant to rust, it has the problem of being fragile in terms of strength and deformability.

An object of the present invention is to make it possible to manufacture a laminated spiral pipe that is resistant to rust, has high strength, and has high deformability.

[Means for Solving the Problems] The present invention provides a strip in which a core material made of a steel plate is covered with a covering material made of a synthetic resin, and a plurality of the strips are wound in a spiral shape, and edge joints of the inner layer side strips are formed. A method for manufacturing a laminated spiral tube consisting of partially laminating each other so as to cover the mating part with an outer layer strip and gluing the tube, the inner roller being oblique to the tube axis of the tube to be manufactured. and outer rollers are arranged along the inner and outer walls of the tube to be manufactured, respectively, and a plurality of the strips are inserted between the inner roller and outer roller so that the strips are partially laminated, and the strips are The laminated parts are heat-sealed together and spirally formed.

[Function] According to the present invention, a laminated spiral tube having high strength and high deformability can be formed due to the presence of the steel plate constituting the core material. Furthermore, since the steel plate is covered with a covering material made of synthetic resin, a laminated spiral pipe that is resistant to rust can be formed. That is, it is possible to manufacture a laminated spiral pipe that is resistant to rust, has high strength, and has high deformability.

In the present invention, the covering material does not necessarily cover both sides of the core material, and may cover only one side of the core material.

[Example] Fig. 1 is a plan view schematically showing an example of a spiral pipe manufacturing device used for carrying out the present invention, Fig. 2 is a side view showing the spiral pipe manufacturing device, and Fig. 3 is a spiral pipe manufacturing device. 4 is a front view showing the pressure bonding/feeding roller, FIG. 5 is an overall view showing the laminated spiral tube, and FIG. 6 is a sectional view taken along the line Vl-VI in FIG. 5.

The laminated spiral tube 10, as shown in FIGS. 5 and 6,
Two strips 11 and 12 having the same cross-sectional size are wound in a spiral shape with the strip widths shifted by, for example, half a width, and the butt-shaped edge joint portion 11A of the inner layer side strip 11 is connected to the outer layer side strip 12. It is constructed by laminating and adhering each other so as to cover each other. 12A is a butt-like edge seam portion of the outer layer side strip 12.

Each of the strips 11 and 12 uses a core material 13 made of a steel plate covered with a covering material 14 made of a synthetic resin such as vinyl chloride resin, polyethylene resin, or synthetic rubber.

At this time, the laminated spiral tube 10 is manufactured by a spiral tube manufacturing apparatus 20 as shown in FIGS. 1 to 4.

The spiral tube manufacturing apparatus 20 includes two pinch roller devices 21 and 22, a first and a second pinch roller device, and a double pinch roller device 21 and 22 disposed in a machine frame 23 has a pinch roller 24, respectively. The pinch roller device 21 can feed the inner strip 11, and the pinch roller device 22 can feed the outer strip 12.

Incidentally, the spiral tube manufacturing apparatus 20 is arranged with a strip insertion guide board 26 for guiding both side edges of the strip 11.12 on the entry side of each pinch roller device 21.22. The strip insertion guide plate 26 can be replaced by a guide roller.

The spiral tube manufacturing device 20 has multiple sets of inner rollers 27 and outer rollers 28. Inner roller 27 and outer roller 2
8 are arranged obliquely to the tube axis of the tube 10 to be manufactured, and along the inner and outer walls of the tube 10 to be manufactured, respectively. The spiral tube manufacturing bag w20 has a plurality of sets of inner rollers 27 and outer rollers 28 arranged as described above from the upstream side to the downstream side along the spiral line around the tube axis of the tube 10 to be manufactured. For example, two rollers 27 on the side
．． 28 is a pressure bonding/feeding roller pair 29, and rollers 27 and 28 on the downstream side thereof are a forming roller pair 30.

Note that the inner roller 27 is supported by the support tube 31, and the outer roller 27 is supported by the support tube 31.
8 is supported by a support beam 32 of the machine frame 23. The rollers 27, 28 are also backed up by springs 33 and are able to pinch the strips 11, 12.

The spiral tube manufacturing device 20 includes a pressure bonding/feeding roller pair 29
A hot air blowing device 34 is disposed on the inlet side. The hot air blowing device 34 includes a blower 35, a heater 36, and a hot air blowing nozzle 37.
．． 22 and heats the laminated portion of the strips 11 and 12 that overlap each other, and also heats the inner layer strip 11 which is already in the spiral forming process as the spiral tube 10 and the inner layer strip 11 fed by the pinch roller device 22. The laminated portion of the outer layer side strip 12 that overlaps the upper surface is heated. Both strips 11.1 are
2 have their covering materials 14 melted, and are then pressed together by a pair of pressing/feeding rollers 29 following the hot air blowing device 34 to be thermally fused together.

Spiral tube manufacturing bag W20 has crimping/feeding roller pair 29
A cooling roller 38 is arranged near the. cooling roller 3
8 cools and solidifies the molten coating material 14 of both strips 11, 12 which are heat-sealed at the press/feed roller pair 29. The cooling roller 38 can be replaced by a cold air blowing nozzle 39.

The rollers 27 and 28 of the pressure bonding/feeding roller pair 29 are connected by a universal joint 41 and are forcibly driven by a drive motor 42, as shown in FIG. In addition, forming roller pair 30
The rollers 27 and 28 may be forcibly driven;
Alternatively, it may be one that is not forcibly driven.

Note that 51 is a guide roller that supports the spiral tube 10 after spiral forming.

Next, a method for manufacturing the spiral tube 10 using the spiral tube manufacturing apparatus 20 will be described.

(2) Strips 11, 12 are prepared, and while being uncoiled, for example, at a Vibrine construction site, they are sent toward the pressure bonding/feeding roller pair 29 by first and second pinch roller devices 21, 22.

At this time, the inner layer side strip 11 and the outer layer side strip 12
is the edge joint portion 11A of the inner layer side strip 11
are covered with the outer layer side strip 12, and the strip insertion guide plate 26 is inserted so that the strips are partially laminated with each other.
guided by.

■When the strips 11 and 12 are inserted between the inner roller 27 and outer roller 28 of the pressure/feed roller pair 29,
It is heated by the hot air blowing device 34. As a result, the inner layer side strip 11 and the outer layer side strip 12 have their coating materials 14 melted, their laminated portions being thermally fused together, and then sent to the subsequent pair of forming rollers 30.

The heat-sealed covering material 14 of the inner layer side strip 11 and outer layer side strip 12 is solidified by a cooling roller 38.

■Strip 11.1 fed into forming roller pair 30
2 is the inner roller 27 and outer roller 2 of the forming roller pair 30.
8 and spirally formed into a long spiral tube 10. The spiral pipe 10 can be immediately installed in a straight line.

According to the spiral tube manufacturing apparatus 20, the presence of the steel plate constituting the core material 13 makes it possible to form the laminated spiral tube 10 with high strength and high deformability. Furthermore, since the steel plate is covered with the covering material 14 made of synthetic resin, the laminated spiral pipe 10 that is resistant to rust can be formed.

That is, it is possible to manufacture the laminated spiral pipe 10 that is resistant to rust, has high strength, and has high deformability.

As a specific manufacturing example using the spiral tube manufacturing apparatus 20, the inventor manufactured a spiral tube using a single-sided polyethylene-coated steel plate as an inner layer strip and an outer layer strip. The core material thickness of the strip is 0.35 m1i, the coating material thickness is 0.15 mm, and the strip width is 200 mm. The inner diameter of the spiral tube is 315 mm, the thickness is 1.0 mm (two layers are wound over each other), and the heating temperature using the hot air blowing device is 15 mm.
The temperature was 0±10° C., and the fusion time was 0.6±0.1 minutes. At this time, the tube manufacturing speed using the spiral tube manufacturing device was approximately 120
mm/min. As a result, it was confirmed that it was possible to provide a laminated spiral tube that is resistant to rust, has high strength, and has high deformability.

In carrying out the present invention, the strength and deformability can be further improved by changing the strength level of the steel plate of the core material, by changing the embedding position of the core material, or by appropriately winding three or more strips in multiple layers.

In addition, by selecting the material and film thickness of the coating material, it is possible to provide not only resistance to rust but also surface properties suitable for various uses.

Further, in carrying out the present invention, the number of rollers disposed around the tube axis of the tube to be manufactured is arbitrary depending on the tube diameter and tube thickness.

[Effects of the Invention] As described above, according to the present invention, a laminated spiral pipe that is resistant to rust, has high strength, and has high deformability can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing an example of a spiral tube manufacturing device used in carrying out the present invention, FIG. 2 is a side view of the spiral tube manufacturing device, and FIG. 3 is a perspective view of the spiral tube manufacturing device. , FIG. 4 is a front view showing the pressure bonding/feeding roller, FIG. 5 is an overall view showing the laminated spiral tube, and FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. 5. DESCRIPTION OF SYMBOLS 10... Laminated spiral tube, 11. 12... Strip, 13... Core material, 14... Covering material, 20... Spiral tube manufacturing device, 27... Inner roller, 28... Outer roller, 29...Pair of pressure bonding/feeding rollers, 30...Pair of forming rollers, 34...Hot air blowing device. Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 3 Figure 5 Figure 6 Figure 1゜

Claims (1)

[Claims] (1) Prepare a strip in which a core material made of a steel plate is covered with a covering material made of synthetic resin, and wind a plurality of the above strips in a spiral shape so that the edge joints of the inner layer strips are covered with the outer layer strips. A method for manufacturing a laminated spiral tube, which consists of partially laminating and adhering a layered spiral tube to each other, the inner roller and the outer roller obliquely intersecting with the tube axis of the tube to be manufactured. A plurality of the strips are arranged along the outer wall and inserted between the inner roller and the outer roller so as to form the partially laminated state, and the laminated portions of the strips are heat-sealed to each other and spirally formed. A method of manufacturing a laminated spiral tube to be formed.