JPS5848334B2 - Manufacturing method of long large diameter plastic pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Plastic pipes are lightweight, have superior corrosive and abrasive conditions on their inner and outer surfaces, and are suitable as fluid transport media.

Therefore, it is well known that it is widely used for water pipes, piping in chemical factories, etc.

However, plastic pipes are difficult to connect compared to metal pipes, which are easy to weld, and although small-diameter pipes that can be transported wrapped around a reel and small-diameter pipes that can be easily connected with flanges have been widely developed, Inner diameter! 500mm to 10
The development of applications for large-diameter plastic pipes exceeding 0.00 mm feels like it is only at the beginning.

Although large-diameter plastic pipes are considered to have great utility as water and drainage pipelines in coastal industrial areas, oil transmission pipes at oil bases, and drainage pipes for coastal dredging work, they are still not fully utilized. The reason why it is not done is because it is difficult to process the connection.

In other words, large-diameter plastic pipes cannot be cut to length due to the location of manufacturing plants and land transportation.
Usually 4m, maximum 10-12m), and in order to use it in the demand area, it must be re-welded or flanged on-site to make it longer, but plastic pipes can be replaced with metal pipes such as steel pipes. Welding is difficult compared to
Another drawback is that flange connection is not easy when the diameter is large.

The present invention focuses on this point, and aims to provide a method for manufacturing seamless long dog-caliber plastic pipes by utilizing marine space near the demand area. The gist of the invention is a method for manufacturing seamless long large-diameter plastic pipes, which is characterized by installing large-diameter plastic pipe manufacturing equipment on a self-propelled work boat and extruding formed plastic pipes into the water. It is something to do.

The drawing is an explanatory diagram of an embodiment using ties, in which a large-diameter plastic pipe manufacturing facility 3 is mounted on a boat 2 towed by a tugboat 1.

This manufacturing equipment 3 uses raw materials supplied from the hopper 31,
It is extruded into a pipe shape from the die 34 through the extruder 32 and the breaker plate 33, and then the sizing mandle 35
The inner and outer surfaces of the pipe are shaped and finished, and the pipe is extruded into the sea by an extrusion roll 37 via a water cooling device 36.

In addition, in the figure, 4 is a formed pipe, 5 is a group of guide rolls,
Reference numeral 38 indicates a reduction gear of the drive motor 39 of the extruder 32, and WL indicates the water surface.

The formed pipe 4 that has exited the extrusion roll 37 is once submerged under the water surface, guided by the guide roll group 5, and discharged from the tail of the solution 2. However, since plastics such as polyethylene and polypropylene have a specific gravity lower than that of water, It rises to the surface of the water due to buoyancy and travels near the water surface as shown by the imaginary line in FIG. 1, becoming a long pipe 4.

At this time, it is preferable to tie a rope to the tip of the formed pipe 4 and guide it, since the longer the pipe becomes, the more likely it will be affected by water currents, waves, or wind.

According to the present invention, it is possible to manufacture seamless long dog-caliber plastic pipes using offshore space near the demand area, and #2 equipped with manufacturing equipment 3 is movable. Pipe 4 can be fabricated by anchoring at the location closest to the work site, and there is no need for transportation from the manufacturing factory to the demand location or on-site connection processing, making it possible to achieve significant cost reductions. It is possible to manufacture large-diameter plastic pipes that do not require large-diameter plastic pipes, which makes subsequent maintenance easy, and not only has the effect of preventing accidents such as leaks from joints and breakage, but also makes it possible to push certain shaped pipes into the water. This has great secondary effects, such as saving on cooling water, and eliminating the need for a factory site since the manufacturing equipment 3 is mounted on the ship 2 and the offshore space is taken over.

Although the above embodiment has been described with respect to an example in which the manufacturing equipment 3 is mounted on the boat 2 towed by the tugboat 1, the same effect can be obtained even if a self-propelled work boat is used instead of the nail 2.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the method of the present invention, and FIG. 2 is a partially cutaway explanatory diagram of plastic pipe manufacturing equipment mounted on a nail cutting work boat. 1...Tugboat, 2...Solution (or work boat)
, 3...Plastic pipe manufacturing equipment, 4...
...Molded pipe.

Claims (1)

[Claims] 1. A long dog-diameter plastic pipe characterized by having large-diameter plastic pipe production equipment mounted on a self-propelled work boat towed by a tugboat and extruding the formed plastic pipe into the sea. manufacturing method.