The paper states the preset, shape and building measures of after pouring seam, and finds out split reasons in after pouring seam and puts forward relevant countermeasures.
阐述了后浇缝的留置、形式和施工措施。找出了后浇缝产生裂缝的原因并提出了相应的对策。
3
The defects will be found in the seam side with ultrasonic inspection but hardly found with X ray inspection as the small diameter spiral pipe production with the split strip steel.