A method for controlling the welding temperature and humidity of the final joint of subsea immersed tube tunnel

Abstract

The invention discloses a method for controlling the welding temperature and humidity of a final joint of a submarine immersed tube tunnel. The method for controlling the temperature and humidity comprises the steps that A, a plurality of air coolers are adopted to convey dry air into a combined cavity of a tube joint of the submarine immersed tube tunnel and the final joint, a plurality of sets of exhaust fan pipelines are arranged in the combined cavity to discharge moist air so that circulating ventilation can be formed in the combined cavity, and welding is started after the welding conditions are met; and B, in the welding process, firstly, the safety welding distance between a weld area and a water stop area is adjusted, then a mirror image area of the water stop area is determined according to the safe welding distance, the temperature of the water stop area is determined by monitoring the temperature of the mirror image area, and the temperature of the water stop area is controlled by controlling the interlayer temperature of the weld area. According to the method, a good welding environment can be formed in the combined cavity, the protection measures for rubber of the water stop can be simplified, the sealing performance and the safety of the water stop can be fully protected, and the problem of the control over the humidity in the combined cavity and the temperature of the rubber part of the water stop can be solved.

Description

technical field [0001] The invention relates to a temperature and humidity control method, in particular to a control method for the temperature and humidity of the final joint welding of a subsea immersed tube tunnel. Background technique [0002] In the subsea tunnel, steel joints are used to weld the final joint of the immersed tube and the pipe joint of the immersed tube to realize the penetration of the entire tunnel. The subsea construction has problems such as high humidity, difficult welding temperature control, and narrow operating space, which belongs to the difficult welding field. [0003] Welding belongs to the melting and forming of materials. In order to ensure the quality of welding, conventional welding is completed in the workshop and the field under wind and rainproof measures. In this type of environment, welding has selective protection measures such as sunny weather, heating measures, post-heating insulation measures, etc. Now Some dehumidifiers and fla...

AI Technical Summary

Problems solved by technology

By using multiple air coolers to deliver dry air to the bonding cavity, and by arranging multiple groups of exhaust fan pipes in the bonding cavity to discharge humid air, it is possible to achieve circulating ventilation in the bonding cavity, thereby improving the welding environment in the bonding cavity and making the bonding The humidity, dust concentration and oxygen content in the cavity can meet the welding requirements; the welding starts after the humidity, dust concentration and oxygen content in the combined cavity meet the welding conditions, in order to avoid defects such as hydrogen pores in the weld caused by excessive humidity, At the same time, if the oxygen content is too low and the dust concentration exceeds the standard, it will affect the performance of the welder's operating skills. Improper operation will easily cause welding defects and affect the pass rate of flaw detection. Control the temperature at the water belt; determine the mirror image area of ​​the water stop area according to the safe welding distance, and measure and monitor the temperature of the mirror image area in real time through a thermometer, so that when the temperature of the water stop area cannot be directly measured, it can be based on The temperature of the area where the water stop is located can be more accurately determined by the temperature of the mirror image area; the temperature of the area where the water stop is located is controlled by controlling the interlayer temperature of the weld area, and the interlayer temperature is controlled within a certain range, which is conducive to making the water stop The temperature in the belt area has been maintained steadily within a certain range, thus ensuring the safety of the waterstop

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