A connection structure and connection method of plastic-coated composite steel pipe

Abstract

The invention discloses a connecting structure of a plastic-coated composite steel pipe. The connecting structure comprises a bearing end and an inserting end positioned at the two ends of the steel pipe and respectively used for connecting an inserting end of a second steel pipe and a bearing end of a third steel pipe, wherein the outer wall shape of the inserting end is matched with the inner wall shape of the bearing end. Meanwhile, the invention further discloses a connecting method of the plastic-coated composite steel pipe; and the connecting method comprises the following steps: a sealing ring is mounted in a sealing ring mounting surface in a cavity of the bearing end at one end of a first plastic-coated composite steel pipe; lubricant is coated on the inner wall of the sealing ring; the lubricant is coated on the outer wall of the inserting end of a second plastic-coated composite steel pipe to be connected; and the inserting end of the second plastic-coated composite steel pipe is inserted in the cavity of the bearing end of the first plastic-coated composite steel pipe.

Description

technical field [0001] The invention relates to the technical field of pipeline connection, in particular to a connection structure and a connection method of plastic-coated composite steel pipes. Background technique [0002] Pipeline is the fastest, economical and reliable way to transport media. Natural gas, water, oil, coal, etc. can all be transported through pipelines. Currently commonly used pipes include plastic pipes, cement pipes, cast iron pipes, steel pipes, etc., especially steel pipes, because their performance and quality are much better than other pipes, so they are widely used. With the continuous development of social productivity, the diameter of pipes used in industrial applications is getting larger and larger, and the weaknesses of steel pipe interface installation, such as complicated process, poor efficiency, high construction cost, and many factors affecting the quality of the interface, are more obvious. It has become the most important factor rest...

AI Technical Summary

Problems solved by technology

With the continuous development of social productivity, the diameter of pipes used in industrial applications is getting larger and larger, and the weaknesses of steel pipe interface installation, such as complicated process, poor efficiency, high construction cost, and many factors affecting the quality of the interface, are more obvious. Become the most important factor restricting the development of steel pipe pipeline

[0003] At present, the interface forms of steel pipes mainly include threaded connection, flange connection and welding connection. Among them, threaded connection is only suitable for small diameter steel pipes, while flange connection is appropriate and reliable and suitable for large diameter steel pipes, but flanges and other accessories need to be added. High cost and difficult to be widely used

Because the welding connection is manually operated on site, there are defects such as complex and backward technology, high labor intensity, low construction efficiency, and the quality of the weld seam is greatly affected by the environment, weather and the level of the operator.

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